Transmission oil cooler bypass

Old School 77 · Feb 15, 2020

fullerman said: ↑

We do it all the time on our rebuilt and exchange units depending on the owner or drivers preference and have been in business for 43 years and never seen a problem. If you have an 1850 or higher torque engine or haul heavy (100000 or above) or spend a lot of time in the low side or on steep grades than you should replace it. The tube oil to water coolers are junk and I would never own one they crack inside leaking engine coolant into the oil destroying the transmission with rust.
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Fullerman I need some advice, are you still on here answering questions

Old School 77 · Feb 15, 2020

fullerman said: ↑

We do it all the time on our rebuilt and exchange units depending on the owner or drivers preference and have been in business for 43 years and never seen a problem. If you have an 1850 or higher torque engine or haul heavy (100000 or above) or spend a lot of time in the low side or on steep grades than you should replace it. The tube oil to water coolers are junk and I would never own one they crack inside leaking engine coolant into the oil destroying the transmission with rust.
Click to expand...

Fullerman I need some advice, are you still on here helping?

bbechtel16 · Jan 7, 2023

dirthaller said: ↑

Had a 93 Freightliner cabover with a rto14613 with no cooler. Replaced trans with rtlo16913a and bypassed the cooler (donor truck had cooler) ran for 3 years then driver called one day on Eisenhower worried about temp...middle of 90 deg. day. Over 230 deg. He pulled over to let cool .....ran truck for another month then retrofitted a cooler. 3 years later....sold truck with same oil no problems........... If it were me, I'd replace the cooler at your EARLIEST convenience, no sooner!
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Sounds to me like it passed the stress test. Worst conditions in your operation and 230 isn't that hot for oil. Many modern engines run this as an oil temp all day on purpose and gear lube is tougher than engine oil.

I know a guy that didn't run an oil cooler in his son's racecar. Ran the whole season on one oil change with the oil running over 300*. No issues.

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