Such a thermally responsive compound in a thermostat 54 of the type described is well known in the prior art. To allow for improved transmission warmup, a thermostatic cold flow bypass valve has been incorporated into the transmission oil cooler. 5 is a view similar to FIG. In the cooling position of FIG. 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 was summer, the Allison had already been built and was seeing more than 290 psi worth of line pressure, and the truck was towing. Once in the factory block, the valve can be pressed straight down until it is fully seated. From the factory, your truck has a transmission cooler bypass so that when cold, the fluid bypasses the transmission cooler for faster warm up. Sonnax cooler bypass valve kit 36605-02K allows the bypass valve assembly to be rebuilt, salvaging the OE fittings, and maintains cracking pressure at 70-75 psi. 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. Breaking Point: How Much Can Your Duramax Handle? 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. We use cookies to optimise our website and give you the best experience on our website. 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. 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. We ended up with no bypass. 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. The components and operation of the valve 68 are substantially the same as that of the bypass valve 10. It acts like a thermostat, staying closed until the temp reaches approx 190 degrees, then opening to allow fluid to flow through the cooler. Starting in 2014, GM started installing a Thermal Bypass Valve on the transmissions. The chamber 42a has a uniform transverse cross section so that the valve member 46a is slidable between the cooling position of FIG. 2. 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. 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. A valve actuating mechanism for an oil cooler bypass valve of the type in which a thermally responsive element expands to urge a valve member against a valve seat and thereby cause oil to flow through an oil cooler. Secondly, the components of the bypass valve are often damaged when the thermally responsive element continues to expand, which sometimes occurs when the cooler is overloaded and the oil heats excessively. 68RFE Transmission Cooler Thermostatic Bypass 2013-18. LinCo DIESEL PERFORMANCE-TROY,MO-transmissions-tubos-monitors-tractionbars-repair-diesel trucks. For our install, Trans-gel assembly lube was used, but transmission fluid, silicone lube, or even Vaseline will work just as well. This causes severe damage to the transmission over time because it is not being adequately cooled by the transmission cooler. If you work your L5P Duramax for a living or on the weekends and have noticed your Allison running warm, you’re not alone. 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. Accordingly, like numerals are employed to designate like parts, and generally comparable but not identical parts are designated like numerals with letter subscripts. The valve 68 includes a cylindrical valve member 46a having a skirt 70 which is longitudinally slidable within the elongated valve chamber 42a. 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. 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. This Tru-Cool Max 4739 unit is a 40K model. FIG. Hot Rod RV Ram: A 1997 Dodge Ram Cummins For The Modern Age. 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. 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. 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. Prior to installing the LDP bypass valve, its O-rings need to be properly lubricated. A Simple Fix for a Potentially Fatal Problem. However, as previously indicated, such extension is accommodated by compression of the relief spring 66. 10-Second Tow Rig: Daily-Driven 900-HP Cummins? 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. Thus, any movement of the spring retainer 60 to the left, as viewed in FIGS. The 99-03 stock 7.3L cooler is a 28k GVW model. © 2004-2021 FreePatentsOnline.com. I get my PML pan tomorrow so I might throw that on first. In the amount of time it takes to read this article, the entire job can be performed on your ’17-present L5P Duramax. Privacy Policy 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. These OE cooler bypass valves tend to fail, causing the transmission and torque converter to overheat and cause major damage. Details of the cooler 18 are omitted for brevity since suitable coolers for cooling oil are well known in the art. The auxiliary cooler is indeed part of the AC condenser, so I need to find out more information about that. 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. In the cooling position of FIG. 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. 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. 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. From the factory, all Allison-equipped ’17-’19 Chevrolet and GMC HD’s employ an auxiliary transmission cooler bypass valve to c 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. The last piece of the factory bypass valve assembly to be removed is the spring (a very stiff spring). The valve actuating mechanism is designed to allow oil to pass through the valve despite incorrect connections between the ports of the bypass valve and the ports of the oil cooler and oil source. 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. The warm-up position of FIG. (45 min. 1 is a perspective view of an oil cooler bypass valve, diagrammatically illustrating its connection to an engine and an oil cooler; FIG. A transmission cooler is a must, but I have no need for a thermal bypass. Read this review and save yourself time and money. If you live in a colder climate and plan to reinstall the valve for winter driving, it has to be reinstalled this way (with the recessed half-moon facing forward, toward the auxiliary cooler lines). My 04 Ody and I drive in Arizona (temp today 115F). But it won't make a difference with the Bypass Valve functioning. A high end transmission shop told me over the phone that he had a customer that wanted that valve bypassed. LinCo Diesel Performance’s transmission cooler bypass valve is CAD-designed, CNC-machined, and features smooth radius’s for optimum flow. When it comes to reinstalling the intake system, a retainer on the bottom of the air box installs in the corresponding slot in the metal mounting tray underneath it. 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. Referring now to FIGS. The external cooler and AC condenser are one assembly with the transmission cooler at the top. UP TO 60 DEGREE TEMP DROP FOR $59.99! 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. The factory bypass cooler valve is located under the air intake assembly. 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. 4R100 Cooler Bypass Delete Kit. The Next Frontier To Duramax Drivability: Duramaxtuner ECM/TCM Matched Tuning Software. An angled pick works best for fishing the spring out. 4, but illustrating the components in a warm-up position. These self-actuating thermal bypass valves monitor inlet flow and automatically divert the fluid based on temperature to one of two outlet ports. 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 next time you drive your truck you’ll be seeing drastically lower transmission fluid temps. 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. 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. With LDP’s drop-in bypass valve in place (top left port), full flow, in and out, is made possible. 3 to the cooling position of FIG. Use of this site constitutes acceptance of our user agreement and privacy policy. At temperatures above 180° F. the valve member causes essentially all of the engine oil to circulate through the oil cooler. Air temps 2 but illustrating the components in a thermostat 54 will have the effect of extending the 62! Be properly lubricated therefore be omitted for brevity since suitable coolers for cooling oil are known... Experience on our website in its cooling position ; and present invention, illustrating the valve is supposed open... 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