Author Topic: Powerglide fluid leak  (Read 3221 times)

Offline 32bantam

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Powerglide fluid leak
« on: September 05, 2016, 08:00:33 AM »
NOT mine !!!!!  lol
A friend's race PG leaks at the pump area. Not when it is running...after it has set for a day. I mentioned about the pump bolts you seal just to be sure...but they were dry. Around the pump looked dry.
The engine has been line bored a couple of times...could the convertor be too high from the crank moving up in the block and cause the leak? It wasn't moved up enough to cause any gear drive issues.....so it can't be up much.
So our question is....could the convertor seal leak at rest and not when running?  Could the outside pump o-ring leak only at rest?
Happy Holiday !!!!
Steve Walczak

Offline bikeguy307

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Re: Powerglide fluid leak
« Reply #1 on: September 05, 2016, 10:34:14 AM »
Pump seal is most like not to leak at rest, there is drain back passage behind it and with no pressure at rest the area behind the seal will drain below the level of the seal. I do not believe the drain back is clogged/restricted as that would show a leak while running as it would be unable to relieve the pressure properly. There would also be a noticeable trail of fluid running down the pump. Now the o-ring how ever can leak at rest as the converter drains off during rest the level in the trans can rise above the bottom of the pump bore and seep past the o-ring. With more and more of our parts being made abroad the quailty is getting worse, I have seen seal and O-ring come in that were not completly molded. I would replace that as well as putting sealer on the threads of the bolts at 5 and 6 o'clock in the pump.

Offline 32bantam

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Re: Powerglide fluid leak
« Reply #2 on: September 06, 2016, 01:21:10 PM »
THANKS Dan................I will pass along the info.
Steve Walczak