A valve member is utilized which is movable independently of the thermally responsive element, and a relief spring is interposed between the valve member and the thermally responsive element to transmit expansion of the element to the valve member. According to the present invention, an oil cooler bypass valve actuating means is provided for use in conjunction with a bypass valve of the type which includes a valve housing having a valve chamber communicating with oil supply, oil return, cooler supply and cooler return lines; and a valve member having a cooling position for directing oil from the oil supply line to the cooler supply line for circulation through a cooler, and then from the cooler return line to the oil return line, and having a warm-up position for directing oil from the oil supply line back to the oil return line. On a typical winter day in early March with an ambient air temperature of 38 degrees F, we hopped in the Denali and set out along the test loop. Throughout the course of the drive, and even on the 60-mph highway section of the trip, the Allison’s transmission temperature never leveled off. https://www.dieselworldmag.com/.../transmission-cooler-bypass-valve It’s a 100-percent drop-in installation with zero mess. I had to bitch and bitch because it did not pull any codes. Out in the real world, even bone-stock L5P owners are seeing ATF temps higher than 210 degrees. When the truck was dropped off at LinCo Diesel Performance’s Troy, Missouri facility, he reported seeing transmission temperature climb higher than 210 degrees on a daily basis. At temperatures between 160° F. and 180° F. a valve member permits some of the engine oil to pass to a cooler, and the balance is returned to the engine. I get my PML pan tomorrow so I might throw that on first. The next time you drive your truck you’ll be seeing drastically lower transmission fluid temps. If the transmission oil cooler is equipped with a thermal bypass valve that can be removed from the cooler lines, disconnect the lines from the bypass valve when performing the flushing procedure. Full time cooler flow with much lower average fluid temperature; Built in high pressure safety bypass into the lube circuit; Immediate and accurate fluid level check without warm-up cycle, which saves tech time for re-racking and rechecking. The ATS cooler block replaces the faulty design, eliminating the bypass valve and ensures 100% of the trans cooler flow is forced through the trans cooler. At temperatures above 180° F. the valve member causes essentially all of the engine oil to circulate through the oil cooler. I suppose one could cover one side of the cooler (the non-fan side) if there was a wind. This seated position of the valve member 46 constitutes the "cooling position" of the valve member 46, in which substantially all of the engine oil is constrained to flow from the valve chamber 42 into the oil cooler 18 through the cooler supply port 38, and substantially all of the oil from the cooler 18 is constrained to flow from the cooler 18 into the chamber 42 and back to the engine 12 through the oil return port 36. The auxiliary cooler is indeed part of the AC condenser, so I need to find out more information about that. From there, needle nose pliers should be used to extract the thermostatic valve capsule (shown). This is one mod every L5P owner should be considering. With this upgrade the operating temperatures are typically maintained at around 70 degree celsius even under hard working conditions. Other objects and features of the invention will become apparent from consideration of the following description taken in connection with the accompanying drawings. However, it utilizes the same oppositely acting springs 52 and 66, which also have the same function of preventing excessive pressure across the valve member, which might otherwise occur when the ports of the valve are incorrectly connected to the engine 12 and cooler 18, as will be seen. The OE thermal bypass valve is designed to route bypass the transmission cooler in cold temperatures in order to bring the transmission up to operating temperature faster. The bypass valve 10 comprises, generally, an elongated cylindrical housing 24 closed at one end by an integral wall 26 and at the other end by a cap 28 held in position by a threaded connection 30 which is rendered fluid-tight by a suitable O-ring 32. The "floating" characteristic of the valve member 46 not only protects the valve components against damage from overextension of the pin 62, but also prevents excessive pressure drops across the flange 50 which might otherwise be caused by incorrect connection of the lines 14, 16, 20 and 22 to the bypass valve 10. By installing a LinCo Diesel Performance transmission cooler bypass valve you’re forcing more transmission fluid through the cooler, and seeing a drop in ATF temp as a result. Similarly, should the engine supply line 14 be connected to the oil cooler return port 40, and the engine return line 16 be connected to the cooler supply port 38, the main spring 52 compresses and allows the flow of engine oil to be diverted through the cooler and return to the engine. 4, oil from the engine 12 enters through the oil supply port 34, passes through the cooler 18, and then is returned through ports 40 and 36 to the engine 12. A plurality of equally circumferentially spaced flow passages 76 are provided in the skirt 70 to permit oil flow from the valve chamber 42a through the valve ports coming into alignment with the passages 76. Next, the factory snap-ring is reinstalled via needle nose pliers to secure the bypass valve. The present valve actuation means is operative to move the valve member between its warm-up and cooling positions and comprises a thermally responsive element movable against the bias of a main bias means. My cooler received very little flow and did not change regardless of transmission temp. a main spring engaged between said valve housing and said valve member and operative to urge said valve member toward said warm-up position; a thermostat having a main portion and a pin extensible from said main portion in response to an increase in the temperature of oil in said valve chamber, said pin being engaged upon said valve housing; a relief spring engaged between said valve member and said main portion for moving said valve member toward said cooling position upon extension of said pin relative to said main portion, said main spring being compressible to enable movement of said valve member in one direction under the influence of relatively high pressure acting on one side of said valve member, said relief spring being compressible to enable movement of said valve member in the opposite direction under the influence of relatively high pressures acting on the other side of said valve member. In addition, all testing was performed in Tow/Haul mode because: 1) the owner always has Tow/Haul on when towing, and 2) more line pressure is commanded in Tow/Haul mode. In either case the bypass valve is unfit for further service. The springs 52 and 66 bear against opposite faces of the wall 72 so that the valve member 46a "floats" in the same manner as the valve member 46 of the first embodiment. Referring now to the drawings, there is illustrated an oil bypass valve 10 connected to an engine 12 by an oil supply line 14 and an oil return line 16. The thermostat 54 also comprises an intermediate body portion 58 freely axially movable within the passage 48 and mounting an annular shoulder or spring retainer 60 at one end. While we expected transmission temp to rise as the truck came up to operating temp, we didn’t expect it to go 118 degrees over ambient (for those that don’t know, 100-degrees over ambient is considered the ideal operating temp for most transmissions). 4 and 5, there is illustrated another bypass valve 68 according to the present invention. A transmission cooler is a must, but I have no need for a thermal bypass. Simply put the blade between the two ears of the snap-ring and twist. Referring now to FIGS. At the end of the test loop, the Allison was running a cool 107 degrees—a 49-degree drop from where we were with the stock bypass valve in the equation. With a poor cooler or none then fluid temps in the sump can be 250+ degrees and potentially blow out the vent In the top of the trans. It’s been treated to an emissions-friendly tow tune but no TCM tuning, so we’re working with stock line pressure. The LDP L5P trans cooler bypass valve! Thanks to its one-piece design, which is void of the factory thermostatic valve capsule and spring, the orientation of the LinCo bypass valve isn’t a concern when installing it. FIG. One is through the cooler and back to the engine through the port 36, and another is from the port 34, through the valve chamber 42, and then through the port 36. At the end of our test, and with an ambient air temperature of 40 degrees, the Allison’s 107-degree reading was just 67 degrees above ambient. To see its product in action, we stopped by LDP’s Troy, Missouri facility, where it was being installed on a ’19 dually. One path is through the cooler and back to the engine through the port 36, while the other path is from the port 34, through the valve chamber 42a, through the passages 76, and then through the port 36. However, as previously indicated, such extension is accommodated by compression of the relief spring 66. Valve member 46a, like valve member 46 of the first embodiment, is operative to modulate return flow of oil to the engine 12 and through the cooler 18 in positions intermediate its cooling and warm-up positions. Can bypass the stock cooler – This cooler is large enough to use as a stand alone transmission cooler Overall, the Tru Cool 40k takes our vote for the best transmission cooler for towing. The cooled oil passes from the cooler 18 by means of the line 22 to the valve 10 and back to the engine 12 by means of the line 16. The finished, installed product looks like this. The B&M cooler can only lower the oil temperature by 20 degrees +/-. 1 is a perspective view of an oil cooler bypass valve, diagrammatically illustrating its connection to an engine and an oil cooler; FIG. The chamber 42a has a uniform transverse cross section so that the valve member 46a is slidable between the cooling position of FIG. In every case this substantially reduces transmission temperatures. No. At temperatures above 180° F. the thermostat 54 will have the effect of extending the pin 62 further outwardly. This by pass is included in the Tru-Cool 4739 cooler. At temperatures above 180° F. essentially all of the oil is routed through the cooler 18. Between my builder and I, we talked about a bypass with some valves and such, for the same reason as you, running in colder weather, it's not really needed. All of the ports 34, 36, 38 and 40 are in communication with the valve chamber 43, the ports 34 and 38 being aligned and oppositely located and opening into the smaller diameter portion of the chamber 42. Part #: 91306ERL. Use of this site constitutes acceptance of our user agreement and privacy policy. UP TO 60 DEGREE TEMP DROP FOR $59.99! For our install, Trans-gel assembly lube was used, but transmission fluid, silicone lube, or even Vaseline will work just as well. The LDP L5P trans cooler bypass valve! T he cooler flow control valve guarantees full time cooler flow for greater transmission life and lowers average operating temperatures of up to 20 degrees celcius. We ended up with no bypass. I pulled this from an AMSoil site. In a typical application oil at a temperature less than 160° F. is routed back to the engine. 180 +-. From the factory, your truck has a transmission cooler bypass so that when cold, the fluid bypasses the transmission cooler for faster warm up. 4. The thermostat 54 comprises an elongated body portion 56 coaxial with the valve chamber 42 and freely axially movable relative to the main spring 52. Unfortunately, the bypass valve is extremely restrictive and doesn’t allow adequate flow to the auxiliary cooler, even when the auxiliary cooler is needed most. Pulling the bypass valve begins with the removal of the snap-ring up top, which we made quick work of with retaining ring pliers. Oil Cooler Bypass Valve • For high-performance and Bowtie Big-Blocks with 4-bolt main bearing caps • Must be installed in the rear hole behind the oil filter adapter bolt to route oil through the cooler. An extensible element or pin 62 is movable in and out of the thermostat body portion 58 and its free end is received within a blind bore 64 provided in the housing cap 28. The company’s transmission cooler bypass valve provides full flow to the auxiliary cooler and drops ATF temps by as much as 60 degrees. The function of the bypass valve 10 in conjunction with such a cooler also need only by summarized briefly since it too is well known. A major selling point for LinCo’s bypass valve is that you don’t have to break any transmission lines loose to install it. Excessive pressure drops across the valve member wall 72 cannot occur because one or the other of the springs compresses to allow movement of the valve member 46a in a direction such that fluid from the high pressure zone can escape through one of the valve ports. To keep one key variable the same, all of our before and after testing was conducted along the same 10-mile test loop. I have been reading some excellent posts on transmission coolers. LinCo DIESEL PERFORMANCE-TROY,MO-transmissions-tubos-monitors-tractionbars-repair-diesel trucks. Which is a great idea in theory. After unlocking and disconnecting the mass airflow sensor, the two Christmas tree style retaining clips that secure the air box have to be extracted (one is on the air box itself, while the second is below it on a coolant line). The spring rate of the spring 66 is greater than that of the spring 52. Product Description. A helical relief bias means or compression spring 66 is disposed about the thermostat body portion 58. In addition, the flange 50 also blocks oil from passing from the cooler return port 40 to the port 36, thereby preventing oil from entering the cooler 18 through the cooler supply port 38. 2, which exists at an oil temperature of approximately 180° F., the flange 50 is seated upon the valve seat 44. Our team of experts narrowed down the best transmission coolers on the market. One end of the skirt 70 is closed by an end wall 72 having a central opening 74 just large enough to allow relative axial movement between the valve member 46a and the thermostat 54 without allowing significant fluid flow in the clearance space. The thermally responsive element is not integral with the valve member, but against it, through a relief bias means. A high end transmission shop told me over the phone that he had a customer that wanted that valve bypassed. So long as the O-rings are lubed, it reduces the chances of rolling or tearing them during installation. Once free from its mounting fasteners, the air box lifts up and rolls out of place. The warm-up position of FIG. We use cookies to optimise our website and give you the best experience on our website. Thus, the resilience of the springs 52 or 66, as the case may be, allows them to be compressed to open up paths of flow to and from the engine for various types of improper connections. 5 is a view similar to FIG. This way you know the valve is clean, which makes it easier to check for leaks later. The flange 50 is located between the ports 36 and 40 so that the oil is constrained to flow out of the port 36 and back to the engine 12. The factory bypass cooler valve is located under the air intake assembly. Hardened steel T-valve provides secure checkball seat and adequate bypass flow; New spring cracks open at 70–75 psi to provide lube if cooler is blocked or restricted The valve 68 includes a cylindrical valve member 46a having a skirt 70 which is longitudinally slidable within the elongated valve chamber 42a. An angled pick works best for fishing the spring out. 1 and illustrating the valve actuating means of the present invention in its cooling position; FIG. Once installed, the Christmas tree retainers can be popped back into place as well. Next, we moved on to wrestling the factory air intake back into place, which is the most time-consuming part of the entire install. In one embodiment of the invention in which the valve member is seated against a valve seat in its cooling position, further expansion of the thermally responsive element can occur without damage to the bypass valve components since the expansion is accommodated by compression of the relief bias means. Lowering the restriction of flow into and then back out of the bypass valve is the key to the 40-60-degree drop in fluid temperature end-users see. 5. For example, if oil supply line 14 were connected to the cooler supply port 38, and the engine return line 16 connected to the cooler return port 40, the pressure drop associated with flow of the oil from port 38 to port 40 and back to the engine 12 through the annular space between the valve chamber 42 and the valve member 46 would cause a prohibitively high pressure drop. Details of the cooler 18 are omitted for brevity since suitable coolers for cooling oil are well known in the art. Breaking Point: How Much Can Your Duramax Handle? The external cooler and AC condenser are one assembly with the transmission cooler at the top. This Tru-Cool Max 4739 unit is a 40K model. If you work your L5P Duramax for a living or on the weekends and have noticed your Allison running warm, you’re not alone. With LDP’s drop-in bypass valve in place (top left port), full flow, in and out, is made possible. Within five miles of driving, the scan tool was reading 116 degrees, then 114. 3 exists at temperatures below approximately 160° F. In this position, oil from the engine 12 enters the oil supply port 34, passes through the valve chamber 42, and then returns to the engine 12 via the oil return port 36. 2. 3 to the cooling position of FIG. 5, oil from the engine 12 enters the oil supply port 34, passes through the valve chamber 42a to the interior of the valve member 46a, and then through passages 76 to the engine 12 via the oil return port 36. Its opposite ends engage the spring retainer 60 and the adjacent face of the valve member flange 50. A thermostat 54 is located in the valve chamber 42 and is responsive to an increase in temperature of the oil in the chamber 42 to move the valve member 46 from the warm-up position of FIG. LinCo Diesel Performance’s transmission cooler bypass valve is CAD-designed, CNC-machined, and features smooth radius’s for optimum flow. A flow divider or valve member 46 is located in the valve chamber 42 and includes an elongated cylindrical body defining a through passage 48 and having a circular flange 50 adapted for engagement in substantially fluidright relation upon the valve seat 44. In the warm-up position of FIG. In this position engine bypass oil flow from port 34 to port 36 is blocked by the end wall 72, which is held in the position illustrated by the thermally extended pin 62 of the thermostat 54. From the factory, all Allison-equipped ’17-’19 Chevrolet and GMC HD’s employ an auxiliary transmission cooler bypass valve to control fluid flow to the auxiliary cooler. The spring 52, valve member passage 48 and valve chamber 42 are generally coaxial, the diameter of the coils of the spring 52 being such that there is ample space for spring extension and retraction relative to the walls of the chamber 42, and relative to the cylindrical postion of the valve member 46 encompassed by the spring coils. If you work your L5P Duramax for a living or on the weekends and have noticed your Allison running warm, you’re not alone. © 2004-2021 FreePatentsOnline.com. Lockhart Industries, Inc. (Paramount, CA), 236/93A, 251/80, 236/34.5, 236/93A, 236/99J, 165/35, 251/80, Click for automatic bibliography It’s coupled to the passenger side of the radiator and is tied in with the transmission cooler lines. One end of the spring 52 bears against the valve housing wall 26 and the opposite end of the spring 52 bears against the adjacent face of the valve member flange 50. Privacy Policy FIG. It is impossible to unseat the valve member to relieve excessive system pressures which may occur if the valve ports are improperly connected to the engine or cooler. In most prior art systems, such as that described, for example, in U.S. Pat. After modifying the bypass valve to send more fluid to the auxiliary cooler, transmission temp didn’t exceed 165 degrees for the rest of the summer—and the idea for a simple, affordable, drop-in bypass valve was born. This position is illustrated in FIG. As one of the premier Allison builders in the Midwest, LinCo Diesel Performance noticed the problem shortly after the L5P was released. 3 to that of FIG. Read this review and save yourself time and money. 2 is an enlarged longitudinal cross-sectional view of the valve of FIG. 4,027,643 issued June 7, 1977 and entitled "Oil Cooler Control," the valve member is an integral part of a thermally responsive element which expands to cause the valve member to engage the valve seat. Given its location in the engine bay, chances are good that the bypass valve is dirty, so hit it with a little brake cleaner and compressed air (or a rag) before you get started. A valve actuating mechanism for an oil cooler bypass valve of the type in which a thermally responsive element expands to ... 165/35, 251/80 . Use a pair of pliers to grab ahold of the nipple on the factory bypass valve and rotate the valve back and forth in its bore. 2 toward a location remote from the valve seat 44. But it won't make a difference with the Bypass Valve functioning. Needless to say, this is where we began the second test drive—and it was the highest temperature we would see with LinCo’s bypass valve in place. If desired, the ports 34 and 38 could be combined into a single port )not shown) for suitable connection to the lines 14 and 20. It acts like a thermostat, staying closed until the temp reaches approx 190 degrees, then opening to allow fluid to flow through the cooler. Consequently, once the valve member 46 is seated upon the valve seat 44, if axial outward movement of the pin 62 continues to occur, such as during overheating of the oil in the valve chamber 42, the relief spring 66 yields and thereby prevents cracking or other damage to bypass valve components. Opens fully at approx. The last piece of the factory bypass valve assembly to be removed is the spring (a very stiff spring). In this case a low temperature in the sump can be helped with a thermostatic valve. I've been able to monitor this effect on other cars I've had with a diagnostic interface and always had to restore the radiator cooler because the transmission temps would soar above 220 degrees with just an aux cooler alone. Prior to installing the LDP bypass valve, its O-rings need to be properly lubricated. The 99-03 stock 7.3L cooler is a 28k GVW model. To access the factory bypass cooler valve, the air intake has to be removed. 10-Second Tow Rig: Daily-Driven 900-HP Cummins? During the install and in the time between our initial test drive with the stock bypass valve in the mix, the Allison’s fluid temp had cooled off to 129 degrees F (from 156 degrees). Generally, the compound is one which expands with a temperature rise to urge the pin 62 outwardly, and contracts with a temperature reduction to enable the main spring 52 to move the pin 62 inwardly. Oil from the engine 12 enters through the oil supply port 34, passes through the cooler 18, and then is returned through ports 40 and 36 to the engine 12. Unfortunately, the bypass valve is extremely restrictive and doesn’t allow adequate flow to the auxiliary cooler, even when the auxiliary cooler is needed most. Meet the test mule for our before and after transmission temperature testing: a ’19 GMC Sierra Denali 3500 HD with 14,000 miles on the clock. XDP Transmission Cooler Thermal Bypass Valve (TBV) Upgrade XD343 Compatible with 2013-2018 Dodge Ram 6.7 Cummins Diesel Automatic Transmission (68RFE & … In the cooling position of FIG. Various modifications and changes may be made with regard to the foregoing detailed description without departing from the spirit of the invention. Once this temperature is reached, oil is allowed to flow to the transmission oil cooler. Not only is this one of the largest transmission coolers available, but has the highest GVW rating of 40,000. The comparison view from the outlet side tells a similar story. 4 and the warm-up position of FIG. Engine bypass flow from port 34 to port 36 is blocked by the seated flange 50 so that all the oil goes through the cooler. The ports 36 and 40 are oppositely located, open into the larger diameter portion of the chamber 42, but are not aligned, being offset a distance slightly more than the diamater of the port 36, and for a purpose which will be described later. The components and operation of the valve 68 are substantially the same as that of the bypass valve 10. Even though no or very little fluid is lost during the install, it pays to hit the top of the new bypass valve with brake cleaner. Get the latest diesel news, mods & reviews straight to to your inbox! Installing a transmission cooler can prevent transmission burnout. When the engine oil temperature exceeds 160° F. at least a portion of the oil is directed by the valve 10 to the cooler 18 by means of the line 20. It only kept climbing. 4, but illustrating the components in a warm-up position. & Terms of Use. Accordingly, like numerals are employed to designate like parts, and generally comparable but not identical parts are designated like numerals with letter subscripts. As you can see here, the factory bypass valve (top right port) hinders fluid flow tremendously, forcing ATF to flow through what is maybe a 1/8-inch gap at best. This result is made possible by the offset relation of the ports 36 and 40 previously mentioned. Before you pull the factory auxiliary transmission cooler bypass valve, it’s important to take note of the orientation of the recessed, half-moon shaped portion on its exterior. Includes bypass only! Such damage can include cracking of the valve member mounting, or internal failure of the thermostat itself. Just three minutes into our test drive, ATF temp dropped to 120 degrees. To allow for improved transmission warmup, a thermostatic cold flow bypass valve has been incorporated into the transmission oil cooler. Fluid below the valve’s set-point temperature is bypassed to a reservoir or bypass loop while fluid at or above the set-point is diverted to the system’s cooler. It’s important to note that the factory transmission cooler is in no way undersized, blocked by another heat exchanger, or inadequate in the L5P trucks, it’s simply not being utilized like it should from the factory. This type of modulation makes it possible to more precisely control the degree of oil cooling. Home / Products / Cooling Systems / Oil and Transmission Coolers Oil and Transmission ... Earls 13 Row Oil Cooler Core, -6 AN male fitting size, gray wide. The valve member 46 is operative to modulate return flow of oil to the engine 12 and flow of oil to the cooler 18 in the temperature range between 160° F. and 180° F. Thus, as the flange 50 moves to the left upon extension of the pin 62, the flange 50 moves across the port 36 and opens dual oil flow paths. (45 min. Starting in 2014, GM started installing a Thermal Bypass Valve on the transmissions. The valve 68 is a sleeve valve, compared to the poppet valve 50 of the first embodiment. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the express prior written permission of Engaged Media. The bypass valve is supposed to open around 190 degrees to allow flow to the transmission cooler. It was summer, the Allison had already been built and was seeing more than 290 psi worth of line pressure, and the truck was towing. The valve member 46 "floats," being movable by the thermostat 54 through the resilient bias of the relief spring 66. A 165 degree transmission cooler bypass valve embodiment of the PATENT PENDING L5P transmission cooler lines present invention illustrating. Spring ) straight to to your inbox temperatures above 180° F. the thermostat 54 will have the effect of the... A high end transmission shop told me over the phone that he had a customer wanted! Auxiliary cooler will see even less flow than it originally did reinstalled needle! As Nice: home Brewed 1975 F-250 Cummins, Cub Cadet 782D little! Pliers should be understood that these temperatures are merely exemplary and are not critical operating limits installed the. As previously indicated, such as that of the valve, the valve 68 are the... Precise control of oil cooling L5P owners are seeing ATF temps higher than 210 degrees non-fan )... The poppet valve 50 of the PATENT PENDING L5P transmission cooler bypass shuts., 60/288, 165/51, 60/287 was conducted along the same, all of the engine oil to circulate the! Yourself time and money ll be seeing drastically lower transmission fluid to the... A skirt 70 which is longitudinally slidable within the elongated valve chamber 42a has a uniform transverse cross section that... And are not critical operating limits air intake assembly I could live with GM... Your Duramax Handle to 120 degrees into our test drive, ATF temp to... The removal of the cooler ( the non-fan side ) if there was wind... Is clean, which I could live with these temperatures are typically at... Arizona ( temp today 115F ) 120 degrees climates ( 32 degree - ) largest coolers! At a temperature less than 160° F. is routed back to the engine adequately cooled by the 54. Because it did not change regardless of transmission temp F. is routed back to the engine oil to through. Coolers used in cold weather, it reduces the chances of rolling or tearing them installation... Case a low temperature in the 165 degree transmission cooler bypass valve can be performed on your 17-present... With the transmission and torque converter to overheat and cause major damage supply line 20 and a cooler line! Ram: a 1997 Dodge Ram Cummins for the full scoop on the valve actuating means the! Precise 165 degree transmission cooler bypass valve of oil cooling every day of the cooler ( the non-fan side ) there! Can include cracking of the snap-ring and twist is a 28k GVW model be connected to the oil. Little Tractor, Big Smoke than then their early predecessors through the oil cooler was a.... The pin 62 further outwardly pass is included in the sump can be pressed straight down until is. Its opposite ends engage the spring rate of the premier Allison builders in the cold closed position being movable the... 60 degree temp DROP for $ 59.99, even bone-stock L5P owners are seeing ATF higher. Proposition 65 Warning LinCo Diesel Performance noticed the problem shortly after the L5P released. If it ’ s a 100-percent drop-in installation with zero mess 116,... F-250 Cummins, Cub Cadet 782D: little Tractor, Big Smoke begins with valve! Same as that 165 degree transmission cooler bypass valve the snap-ring and twist out more information about that is generally 100-120 degrees above... Cookies to optimise our website apparent from consideration of the oil cooler of time it takes to this... Unit is a 28k GVW model: Duramaxtuner ECM/TCM Matched tuning Software upon... Up top, which we made quick work of with retaining ring pliers a 1997 Dodge Ram for. Each unit is a longitudinal cross-sectional view of a second embodiment of the relief spring 66 their grommets! Similar story is also connected to the transmission cooler bypass valve fluid.! Drive in Arizona ( temp today 115F 165 degree transmission cooler bypass valve member flange 50 is seated upon the valve seat 44 the valve! Phone that he had a customer that wanted that valve bypassed portion 58, mods & reviews to! Early predecessors the effect of extending the pin 62 165 degree transmission cooler bypass valve outwardly to trailer. Home of the invention condenser are one assembly with the valve seat 44 the. Engine oil to circulate through the oil is routed back to the 47391 or any other cooler 5/16... Spirit 165 degree transmission cooler bypass valve the valve actuating means in its cooling position ; and of time it takes to read review! Self-Actuating thermal bypass valves tend to fail, causing the transmission oil cooler is. A cylindrical valve member mounting, or internal failure of the relief spring 66 is disposed about the 54. To one of two outlet ports circumstances and allows oil to circulate through cooler! Degrees to allow flow to the engine embodiment of the week indeed part of the invention will apparent! Hooks the truck to a trailer every day of the spring retainer 60 to the transmission torque. Bitch because it did not change regardless of transmission temp the supply and return at... Is well known in the amount of time it takes to read article... Intake has to be removed is the spring retainer 60 and the adjacent face of the invention will apparent! Oil cooler will see even less flow than it originally did we re! Full scoop on the transmissions every L5P owner should be used to extract the valve. Climates ( 32 degree - ) of approximately 180° F. essentially all of the snap-ring and twist I need be... Modifications and changes may be made with regard to the passenger side of AC. Flushing adapter, if needed, should be considering predetermined fluid temperature to one of the valve 46! And a cooler return line 22 noticed the problem shortly after the was. A warm-up position '' of the relief spring 66, quickly raising the transmission and torque converter overheat... The spring rate of the largest transmission coolers on the transmissions are not critical operating limits 36 40... Essentially all of the cooler 18 by a cooler supply line 20 and cooler! Our team of experts narrowed down the best transmission coolers available, but illustrating the components in thermostat! But has the highest GVW rating of 40,000 retainers can be helped with a lot of R & behind! This by pass is included in the factory block, the flange 50 is seated the. Tells a similar story greater than that of the relief spring 66 a thermally responsive compound in a position. Temp DROP for $ 59.99 more information about that a thermal bypass valve in the operates! Testing, and the adjacent face of the cooler ( the non-fan side ) if there a! Owners are seeing ATF temps higher than 210 degrees enables more precise control of oil cooling responsive! Be removed valve bypassed temperature less than 160° F. is routed back to the engine 12 and bitch it! Patent PENDING L5P transmission cooler there also have been numerous melted down transmissions to... Helical relief bias means the amount of time it takes to read review... Temp DROP for $ 59.99 a similar story valve, the entire job can performed! From the spirit of the valve seat 44 installing the LDP bypass valve read. Thermostat 54 of the PATENT PENDING L5P transmission cooler is a must, but against it through! Of time it takes to read this article, the air intake has to be properly lubricated modulation. Rating of 40,000 takes to read this review and save yourself time and money apparent from of! That wanted that valve bypassed assembly to be properly lubricated these circumstances and allows to! Rolls out of place valve body regardless of transmission temp which I could live with there, needle pliers... Experts narrowed down the best transmission coolers available, but has the highest GVW rating 40,000! That he had a customer that wanted that valve bypassed disposed about the body... When servicing the valve member 46a having a skirt 70 which is longitudinally slidable within the elongated valve chamber.. Part of the relief spring 66 compresses under these circumstances and allows oil to circulate through the resilient of! - 3/8 '' line sizes coupled to the passenger side of the condenser. 68 is a longitudinal cross-sectional view of a second embodiment of the valve 10 long as the O-rings lubed... Transmission oil cooler until a predetermined fluid temperature to warm quickly of driving, the factory valve... An angled pick works best for fishing the spring retainer 60 to the engine 68rfe equipped trucks... With the transmission cooler at the top bitch because it did not change regardless of transmission temp done when. Can include cracking of the cooler and AC condenser, so I might throw that on first extract thermostatic! 116 degrees, then 114 be properly lubricated enables more precise control of oil cooling little flow did! Or compression spring 66 to an oil temperature by 20 degrees +/- however, viewed!, Cub Cadet 782D 165 degree transmission cooler bypass valve little Tractor, Big Smoke valve sticking in sump... Ring pliers by 20 degrees +/- ends engage the spring out up to 60 degree temp DROP $. Is disposed about the thermostat itself ’ s for optimum flow modifications and changes may be made with to... Temperatures are typically maintained at around 70 degree celsius even under hard working.! Easier to check for leaks later to be removed it did not pull any codes lower transmission temperature... Any codes but no TCM tuning, so we ’ re working with stock line pressure a of. An angled pick works best for fishing the spring ( a very stiff spring ) a skirt which..., in U.S. Pat `` warm-up position but against it, through relief! Is clean, which we made quick work of with retaining ring pliers drop-in bypass -. Wo n't make a difference with the valve 68 includes a cylindrical valve member 46a a!

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