Transmission temp and front cover

[deaner70]

Just installed a Genos front cover and it works great. I did notice that the transmission temp is reading around 165-170 with it closed up in the front. Normal? I am not sure what a good temp is for the transmission. I know towing the goose in the summer it would get up to about the same. With it open, it barely reaches 130

Thanks

 

[Ozymandias]

The Trans Temp is usually close together with the Water Temp with closed cover. Because of the Water/Oil Heat exchanger.
So it is.

 

[deaner70]

OK.. I looked at the gauge and mis spoke. It barely ever come off of 100, thats the starting point of the gauge. What temp should I start getting worried when towing/hauling

 

[p-Bar]

mid 200's especially if reading off the post side of the cooler

 

[cerberusiam]

mid 200's especially if reading off the post side of the cooler

Uhhh, that might be just a little high for trans temp.

Typically anything between 140 and 190 is acceptable for the long term, short term temps can easily exceed 200 degrees for a couple minutes with no issues. I wil depend on air flow and ambient temp what the readings will be.

 

[p-Bar]

Cerb wouldn't you say most trans temp gauges are post cooler so you really aren't getting what the hot temp is coming out of the tc. So you are really being fooled.

 

[cerberusiam]

Post cooler doesn't really have a meaning unless you tap into the return line for the gauge. The pan temp is a mix of hot fluid from the TC, more in fluid coupling less in lockup, but not all of the output from the TC is routed to the cooler. These is pressure valve that limits what goes thru the cooling system. The pan is also a mix of the fluid after is has been cooled and run back thru all the drums, clutch packs, bearings and thrust washers to cool and lube them. It is aggragte reading thta is easy to obtain.

The other easy place is a probe in one of the test ports. That is just reading heat soak in the tran. Test ports have no flow so they never see real fluid temp just heat soak from the whole trans.

Either place will dramatically affect the actual readings depending on load, ambient temp, driving style, etc. Typically they will read much lower than maximum fluid temp right out of the TC.

 

[p-Bar]

Sorry i meant pre cooler I monitor at that point find it to get pretty hot especially in reverse.

 

[cerberusiam]

Yes, pre-cooler is the absolute hottest point of the fluid at any time. Reverse will get way hot becasue it such an abnormal condition in the transmission and the ratio is not low enough. Reverse runs thru 2 planetaries to reverse the direction adn it takes massive amoints of TQ which just heats the fluid fast to push the weight.

Mid 200's is possible in extreme conditions like reverse and heavy loads as the TC does not lock, but, it should not be that high in forward gears. 220 at the most in fluid coupling, high ambient temps, a heavy load. Once the TC locks it should droip back to the 180-190 range with good air flow. If the temp starts pushing mid 200's frequently and not cooling down fast then it is time to worry.

Will never see those temps with a probe in the pan or test port in normal conditions. If you do, plan on a rebuild as it has cooked something badly.