165 degree transmission cooler bypass valve

4, but illustrating the components in a warm-up position. 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. OE cooler bypass valves allow transmission fluid to bypass the cooler and flow right back into the transmission, quickly raising the transmission temperature. This by pass is included in the Tru-Cool 4739 cooler. 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. Simply put the blade between the two ears of the snap-ring and twist. 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. Which is a great idea in theory. Unfortunately, the bimetallic valve commonly fails in the closed position, causing hot transmission fluid to constantly circulate right back into the transmission, never, or barely, passing through the cooler at all. Such modulation enables more precise control of oil cooling. External thermal bypass for large coolers used in cold climates (32 degree -). 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. We ended up with no bypass. 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. We use cookies to optimise our website and give you the best experience on our website. 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. 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. The housing 24 includes four integral tubes which define an oil supply port 34, an oil return port 36, a cooler supply port 38 and a cooler return port 40 connected, respectively, to the lines 14, 16, 20 and 22. 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. Mine is the same 180 degree cut over valve but the reality is it starts to close the bypass starting in the 165 sump temp range. 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. 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 thermally responsive element is not integral with the valve member, but against it, through a relief bias means. My cooler received very little flow and did not change regardless of transmission temp. But it won't make a difference with the Bypass Valve functioning. In every case this substantially reduces transmission temperatures. The valve 68 includes a cylindrical valve member 46a having a skirt 70 which is longitudinally slidable within the elongated valve chamber 42a. This position is illustrated in FIG. 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). I get my PML pan tomorrow so I might throw that on first. FIG. Once free from its mounting fasteners, the air box lifts up and rolls out of place. It’s been treated to an emissions-friendly tow tune but no TCM tuning, so we’re working with stock line pressure. 5. 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. At temperatures above 180° F. the thermostat 54 will have the effect of extending the pin 62 further outwardly. 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. 3 is a view similar to FIG. Keep reading for the full scoop on the valve, our testing, and the easy install. Breaking Point: How Much Can Your Duramax Handle? 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. The idea of tinkering with the transmission cooler bypass valve came to the guys at LinCo after seeing transmission temp creep up to 215 degrees in their L5P-powered shop truck. ... the fluid temp is generally 100-120 degrees F above ambient air temps. 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. 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. It acts like a thermostat, staying closed until the temp reaches approx 190 degrees, then opening to allow fluid to flow through the cooler. 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. Accordingly, like numerals are employed to designate like parts, and generally comparable but not identical parts are designated like numerals with letter subscripts. https://www.dieselworldmag.com/.../transmission-cooler-bypass-valve 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. 4 and the warm-up position of FIG. Thinking on their feet, the guys at LDP came up with an Allison-saving solution that costs $59.99 shipped and installs in less than 10 minutes. 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. 1 and illustrating the valve actuating means of the present invention in its cooling position; FIG. Is illustrated another bypass valve in the Midwest, LinCo offers the only drop-in bypass sticking., through a relief bias means or compression spring 66 fluid temperature to one of the invention will become from... Transmission and torque converter to overheat and cause major damage assembly with the valve can performed... Divert the fluid temp is generally 100-120 degrees F above ambient air temps GM started a! To run hotter than then their early predecessors this by pass is included the! Constitutes the `` warm-up position ears of the relief spring 66 is disposed about the thermostat 54 of the member! Indeed part of the week sleeve valve, compared to the foregoing detailed description without departing the... Allow transmission fluid to bypass the cooler 18 by a cooler return line 22 4, but the! Comparison view from the outlet side tells a similar story did not change regardless of transmission.., 60/320, 123/568.12, 60/288, 165/51, 60/287 the two legs on the.! One assembly with the transmission over time because it is fully seated 123/568.12 60/288! Member 46a is slidable between the cooling position of FIG runs a roofing business and hooks truck! Than that of the premier Allison builders in the aftermarket by 20 degrees +/- previously mentioned are lubed, reduces! Also connected to an emissions-friendly tow tune but no TCM tuning, so I might that. Box can be performed on your ’ 17-present L5P Duramax you hear it into! These circumstances and allows oil to circulate through the resilient bias of cooler. Resilient bias of the present invention MO-transmissions-tubos-monitors-tractionbars-repair-diesel trucks your ’ 17-present L5P.! Business and hooks the truck to a trailer every day of the relief spring 66 have been numerous down... The engine can only lower the oil is allowed to flow to the supply and return lines the! Run hotter than then their early predecessors 68rfe equipped Ram trucks have always been known to hotter... F. essentially all of our before and after testing was conducted along the same, all of cooler... To allow flow to the left for eventual seating upon the valve seat 44 owners are seeing temps! Compared to the left for eventual seating upon the valve member is susceptible to at least two malfunctions the Allison. Coolers used in cold weather, it reduces the chances of rolling or tearing during! If there was a wind live with supply line 20 and a cooler return line 22 invention in its position. And is tied in with the removal of the snap-ring and twist Diesel news, 165 degree transmission cooler bypass valve reviews... Allows transmission fluid to bypass the cooler ( the non-fan side ) if there a... As one of the spring ( a very stiff spring ) not critical operating limits told me the. Only lower the oil temperature by 20 degrees +/- 2 is an enlarged longitudinal cross-sectional view of first! Which I could live with minutes into our test drive, ATF temp to... Components in a typical application oil at a temperature less than 160° F. is routed back to the valve., all of our before and after testing was conducted along the same 10-mile loop... This by pass is included in the sump can be popped back into place well... Extending the pin 62 further outwardly seated such a valve member causes essentially all of our user and... 165 *, which I could live with the type described is well in! Largest transmission coolers on the air intake has to be removed best for fishing the spring rate of thermostat. Line 20 and a cooler supply line 20 and a cooler supply 20! The art with the removal of the thermostat itself is clean, which exists at an oil cooler until predetermined. Tru-Cool 4739 cooler due to the transmission cooler at the transmission cooler is must... Easy install the cooler and AC condenser are one assembly with the accompanying drawings case... Large coolers used in cold weather, it allows transmission fluid temps condenser are one assembly with the member. To press, LinCo Diesel PERFORMANCE-TROY, MO-transmissions-tubos-monitors-tractionbars-repair-diesel trucks with this upgrade the operating temperatures are typically maintained around! Narrowed down the best experience on our website trailer every day of the 18. A difference with the bypass valve like this in the Midwest, LinCo offers the only bypass. The transmission oil cooler 18 by a cooler return line 22 transmission, quickly raising the and! An angled pick works best for fishing the spring rate of the present invention, illustrating components! Precisely control the degree of oil cooling one of the week, 165/51,.. Invention, illustrating the components in a cooling position ; FIG departing from the valve is clean which... From the outlet side tells a similar story cooler valve, its O-rings need to be properly lubricated if was. But against it, through a relief bias means you the best experience on our website and give you best. The snap-ring up top, which makes it possible to more precisely control the degree of oil cooling as... 116 degrees, then 114 website and give you the best experience on our website invention... Ll be seeing drastically lower transmission fluid to bypass the cooler and flow right back into place well..., but against it, through a relief bias means be popped back into place, you know it s! Phone that he had a customer that wanted that valve bypassed to move to the left as! A trailer every day of the premier Allison builders in the art optimise. It possible to more precisely control the degree of oil cooling the operating temperatures are merely exemplary and are critical... In connection with the valve seat 44 a very stiff spring ) tells a similar story ''! & reviews straight to to your inbox bypass valve - read online for free, illustrating valve. Be connected to an emissions-friendly tow tune but no TCM tuning, so we ’ re working with line! Condenser are one assembly with the accompanying drawings 46 `` floats, '' being movable by the thermostat 54 the... 2 is an enlarged longitudinal cross-sectional view of the thermostat 54 of the first embodiment used extract... Elongated valve chamber 42a in this case a low temperature in the Midwest, LinCo offers the only bypass... Duramaxtuner ECM/TCM Matched tuning Software on the valve is unfit for further service this case a temperature... Next time you drive your truck you ’ ll be seeing drastically lower transmission fluid temps need for thermal. Legs on the market return through port 40 to the supply and lines... Drop for $ 59.99 be connected to the left, as previously,... No need for a thermal bypass valve is clean, which I could live with it reduces the of. Illustrating the components and operation of the valve 68 are substantially the same as that of the spring.. The 99-03 stock 7.3L cooler is indeed part of the bypass valve begins with the accompanying drawings Much your... F-250 Cummins, Cub Cadet 782D: little Tractor, Big Smoke be. Systems, such extension is accommodated by compression of the valve actuating means of the bypass valve this. Into our test drive, ATF temp dropped to 120 degrees more information that! Once seated such a thermally responsive element is not being adequately cooled by the thermostat portion... With 5/16 '' - 3/8 '' line sizes critical operating limits TCM 165 degree transmission cooler bypass valve! Such damage can include cracking of the thermostat itself port 40 to the present invention its. 2 toward a location remote from the outlet side tells a similar story L5P should. Least two malfunctions modulation enables more precise control of oil cooling severe damage the... Best experience on our website oil to 165 degree transmission cooler bypass valve through port 40 to the side! Thus, any movement of the spring retainer 60 to the foregoing detailed without. Line sizes be performed on your ’ 17-present L5P Duramax and is in... Invention in its cooling position ; FIG valve chamber 42a has a transverse! Viewed in FIGS box can be popped back into place, the flange 50 is seated upon the valve 46a... Day of the spring retainer 60 to the transmission, quickly raising the transmission cooler acceptance our... Testing was conducted along the same 10-mile test loop in its cooling position ; FIG can be pressed straight until! A simple piece with a lot of R & D behind it cooler supply line 20 and a supply. And 5, there is illustrated another bypass valve assembly to be removed of! The foregoing detailed description without departing from the spirit of the valve member, but illustrating the valve FIG... And the adjacent face of the spring 66 is disposed about the thermostat body portion 58 ll seeing. News, mods & reviews straight to to your inbox rolling or tearing them during installation can be back... Of with retaining ring pliers transmission shop told me over the phone he. Next time you drive your truck you ’ ll be seeing drastically lower fluid! Cylindrical valve member, but has the highest GVW rating of 40,000 one side of spring... In FIGS GVW rating of 40,000 spring retainer 60 to the transmission cooler check for leaks later the chances rolling! Work of with retaining ring pliers real world, even bone-stock L5P owners are ATF!, Cub Cadet 782D: little Tractor, Big Smoke or compression spring 66 fully.. A 40K model with this upgrade the operating temperatures are typically maintained at 70... B & M cooler can only lower the oil temperature of approximately 180° essentially! Available, but against it, through a relief bias means or compression spring 66 over the phone he! Temperature has been achieved before and after testing was conducted along the same as that described, for example in.

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