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Old 09-26-2012, 02:44 PM
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TH 350 cooler line oil flow

TH 350 gurus, i need your help, while i was working on the fluid cooler lines, i didn't remember what was the cooler feed oil/out for the cooler so i started up the engine to see from where the fluid is supposed to come out , ATF was coming out from both lines!, way more from the lower port (wich is supposed to be the right one) but also a little bit from the "return line".
Transmission was in N, don't now if this weird flow happens also with the shifter in that position , i have to try in P but now i'm concerned about something wrong in the oil pump assembly, may be that i forgot a checkball in somewhere during the rebuild?
Trans is freshly rebuilt and got a TransGo shift kit on it.
Any help will be apprecciated.

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Old 09-27-2012, 06:14 AM
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The Bottom line is the Feed/Out which has pressure.
The Top line is Return/In, it doesn't have suction so some fluid may flow out there.

Radiator with side tanks:
Bottom = Feed/In from bottom Trans line.
Top = Return/Out to top Trans line.
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Old 09-27-2012, 07:29 AM
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Quote:
Originally Posted by SSedan64 View Post
The Bottom line is the Feed/Out which has pressure.
The Top line is Return/In, it doesn't have suction so some fluid may flow out there.

Radiator with side tanks:
Bottom = Feed/In from bottom Trans line.
Top = Return/Out to top Trans line.
Thank you, that's what i've thought so i put my finger on the return/in line to see if it has any pressure but i can easily stop the flow, in the other line has a little bit more pressure , i hope that's enaugh to create a flow in the circuit cooler otherwise it's a problem.
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Old 09-27-2012, 08:37 AM
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Quote:
Originally Posted by jeepers creepers View Post
Thank you, that's what i've thought so i put my finger on the return/in line to see if it has any pressure but i can easily stop the flow, in the other line has a little bit more pressure , i hope that's enaugh to create a flow in the circuit cooler otherwise it's a problem.
The bottom cooler line from the tranny going to the cooler should have around 20 psi cold at idle speed. Up to 45-55 psi revving it up.

You can check the pressure before and after the cooler(s) to see if there's excessive pressure drop.
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Old 09-27-2012, 06:17 PM
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Design of the trans pump , stator and input shaft... With wear on the bushings and shaft, the oil takes the path with least resistance, so oil flows out each port with nothing attached.


With a cooler and lines installed , the oil is pushed the correct path.
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Old 09-28-2012, 12:41 AM
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Originally Posted by Crosley View Post
Design of the trans pump , stator and input shaft... With wear on the bushings and shaft, the oil takes the path with least resistance, so oil flows out each port with nothing attached.


With a cooler and lines installed , the oil is pushed the correct path.
You made me an happy man for today, thank you!
By the way , tranny has been freshly rebuilt and i changed as weel all the bushings.
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