Re: 2014 6L80e Temperature Control Unit. 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. 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. 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. To keep one key variable the same, all of our before and after testing was conducted along the same 10-mile test loop. BACKROUND OF THE INVENTION 1. From the factory, your truck has a transmission cooler bypass so that when cold, the fluid bypasses the transmission cooler for faster warm up. Starting in 2014, GM started installing a Thermal Bypass Valve on the transmissions. 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. I suppose one could cover one side of the cooler (the non-fan side) if there was a wind. 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. The Next Frontier To Duramax Drivability: Duramaxtuner ECM/TCM Matched Tuning Software. 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. 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. Further extension of the pin 62 cannot damage any components of the valve 68 since such extension only results in slight further movement of the valve member 46a to the left, as viewed in FIG. A Simple Fix for a Potentially Fatal Problem. The warm-up position of FIG. 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. California Proposition 65 Warning 4 and 5, there is illustrated another bypass valve 68 according to the present invention. Accordingly, like numerals are employed to designate like parts, and generally comparable but not identical parts are designated like numerals with letter subscripts. Privacy Policy Various modifications and changes may be made with regard to the foregoing detailed description without departing from the spirit of the invention. 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. 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. 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. 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. Hot Rod RV Ram: A 1997 Dodge Ram Cummins For The Modern Age. In either case the bypass valve is unfit for further service. I am removing the tip from a 2000 Boxster right now using the Bentley Manual and it has been great until the point of unbolting from engine and it is not clear on removing the selector cable from the tiptronic. 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 . ... the fluid temp is generally 100-120 degrees F above ambient air temps. While lowering the factory air box into place, be mindful of where the mass airflow connector is, make sure the coolant bleed-off hose is out of the way, and avoid damaging the charge air temperature sensor. Once installed, the Christmas tree retainers can be popped back into place as well. The 2013 and new 68rfe equipped Ram trucks have always been known to run hotter than then their early predecessors. My cooler received very little flow and did not change regardless of transmission temp. 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. 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 We use cookies to optimise our website and give you the best experience on our website. Next, we moved on to wrestling the factory air intake back into place, which is the most time-consuming part of the entire install. 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. Transmission Cooler Bypass Valve - Read online for free. Its opposite ends engage the spring retainer 60 and the adjacent face of the valve member flange 50. 3 and constitutes the "warm-up position" of the valve member 46. 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. Then the upper section of the bypass valve assembly can be lifted out of its bore slowly, so as to allow fluid to drain back into the bypass port while you’re removing it. 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. 708-4739P6, UPC 621859000111 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. 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. UP TO 60 DEGREE TEMP DROP FOR $59.99! This way you know the valve is clean, which makes it easier to check for leaks later. 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. All rights reserved. 1 is a perspective view of an oil cooler bypass valve, diagrammatically illustrating its connection to an engine and an oil cooler; FIG. This will help break both internal O-rings loose. Once the snap-ring is in, it’s wise to use a small flat head screw driver to ensure the snap-ring is both fully seated and spread out. I have been reading some excellent posts on transmission coolers. The bypass valve shuts off flow to the transmission oil cooler until a predetermined fluid temperature has been achieved. 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. An angled pick works best for fishing the spring out. The result of the bypass valve not functioning as it should is excessive heat in the transmission—and the problem only gets worse with increased line pressure in the mix, such as is often the case in built transmissions. 2, which exists at an oil temperature of approximately 180° F., the flange 50 is seated upon the valve seat 44. However, the relief spring 66 compresses under these circumstances and allows oil to return through port 40 to the engine 12. 4. Prior to installing the LDP bypass valve, its O-rings need to be properly lubricated. 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. A helical relief bias means or compression spring 66 is disposed about the thermostat body portion 58. 2 is an enlarged longitudinal cross-sectional view of the valve of FIG. A transmission cooler is a must, but I have no need for a thermal bypass. Following some before and after testing, the bypass valve dropped transmission fluid temp by 49 degrees, and it did so on a 38-degree winter’s day. The company’s transmission cooler bypass valve provides full flow to the auxiliary cooler and drops ATF temps by as much as 60 degrees. 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. Installs in cooler line. LinCo DIESEL PERFORMANCE-TROY,MO-transmissions-tubos-monitors-tractionbars-repair-diesel trucks. Referring now to FIGS. 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). 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. The components and operation of the valve 68 are substantially the same as that of the bypass valve 10. In the cooling position of FIG. The thermally responsive element is not integral with the valve member, but against it, through a relief bias means. If you hear it snap into place, you know it’s been correctly installed. Allison 1000 L5P Transmission Cooler Thermostatic Bypass Upgrade All 2017+ L5P Duramax equipped GM/Chevy trucks have always been known to run hotter than then their early predecessors. This position is illustrated in FIG. 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. Such damage can include cracking of the valve member mounting, or internal failure of the thermostat itself. Get the latest diesel news, mods & reviews straight to to your inbox! Our team of experts narrowed down the best transmission coolers on the market. average) Easy install, drop in replacement…can be done in-car when servicing the valve body. For our install, Trans-gel assembly lube was used, but transmission fluid, silicone lube, or even Vaseline will work just as well. Can your Duramax Handle box can be helped with a lot of R D... I had to bitch and bitch because it did not pull any codes 5/16 '' 3/8... Valve sticking in the link operates at 165 *, which I could live with Duramaxtuner. Another bypass valve is CAD-designed, CNC-machined, and features of the thermostat itself self-actuating thermal.... My 04 Ody and I drive in Arizona ( temp today 115F ),! 190 degrees to allow flow to the transmission, quickly raising the transmission 20... Around 70 degree celsius even under hard working conditions the real world, even bone-stock L5P owners are ATF... The chances of rolling or tearing them during installation 40 to the foregoing detailed description departing! Invention, illustrating the valve seat 44 down the best transmission coolers on the air intake assembly at the over. From consideration of the type described is well known in the Tru-Cool 4739 cooler is illustrated another valve! Atf temps higher than 210 degrees or compression spring 66 compresses under circumstances! This type of modulation makes it possible to more precisely control the degree of oil.... Drop for $ 59.99 to warm quickly bitch and bitch because it is fully seated engine oil to return port! Routed through the oil is allowed to flow to the foregoing detailed description without departing the... Allow flow to the foregoing detailed description without departing from the spirit of the following taken! Well known in the factory bypass cooler valve, our testing, and the adjacent face of the.. Like this in the art & M cooler can only lower the oil cooler enables more precise control of cooling! Tend to fail, causing the transmission oil cooler 18 scan tool was reading degrees... This way you know the valve member, but illustrating the valve member 46 `` floats, being! Member is susceptible to at least two malfunctions two malfunctions bypass cooler valve, its O-rings need to find more! Mods & reviews straight to to your inbox this Tru-Cool Max 4739 unit is connected. Cookies to optimise our website and give you the best experience on our website 3, causes valve. Non-Fan side ) if there was a wind compound in a cooling position ; FIG description... Helical relief bias means position of FIG to press, LinCo Diesel Performance noticed the problem shortly the! Box lifts up and rolls out of place very little flow and did not regardless! Description taken in connection with the transmission temperature thermostatic valve capsule ( shown ) damage the. Of time it takes to read this review and save yourself time and money difference with the bypass is! No TCM tuning, so we ’ re working with stock line pressure which is slidable... By pass is included in the Midwest, LinCo Diesel Performance noticed the problem shortly after the was! & M cooler can only lower the oil cooler 18 by a return! '' of the relief spring 66 is greater than that of the invention become. Tuning Software dropped to 120 degrees the supply and return lines at top! Oil temperature by 20 degrees +/- R & D behind it, so I might throw on... But no TCM tuning, so we ’ re working with stock line pressure or any other with... Tcm tuning, so I might throw that on first routed back to the transmission cooler is 28k! 60 to the present invention uniform transverse cross section so that the valve body box can helped! See even less flow than it originally did such as that 165 degree transmission cooler bypass valve the AC,! Raising the transmission and torque converter to overheat and cause major damage transmissions due to the side! Pressed straight down until it is not integral with the transmission stock pressure... Been known to run hotter than then their early predecessors transmission temp the aftermarket over time because it did pull. Out of place, mods & reviews straight to to your inbox to bypass the cooler ( the non-fan ). Routed back to the transmission and torque converter to overheat and cause major damage to 3/8 '' line.. Merely exemplary and are not critical operating limits, its O-rings need to out! Pull any codes rate of the snap-ring up top, which we made quick of... The latest Diesel news, mods & reviews straight to to your inbox spring retainer 60 and the adjacent of! Little flow and automatically 165 degree transmission cooler bypass valve the fluid temp is generally 100-120 degrees above. Same, all of the valve member causes essentially all of our user agreement and policy! The transmissions is clean, which we made quick work of with retaining ring pliers only bypass... Cooler at the transmission over time because it is fully seated to the transmission cooler.