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Old 08-28-2006, 03:34 PM
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TH 350 leaks and can't find where...

how can I find where the oil is coming from? the pan gasket is not, the link shaft seal is not either, the pump's definitelly not, could there be a crack in the case? is this possible? I also suspect of the vent, how could the oil come out the vent if possible? I don't think is overheating.
thanks
Augusto.

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Old 08-28-2006, 03:47 PM
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Th350

some of the old th350 Alu cases had a problem with case porosity fluid bleeds through the case because of the casting process (there was a fix in the 78 service manuals to clean the case and coat with two part epoxy) Not a transmission expert just something I read while in the service manual) Hope that helps.
BarryH
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Old 08-28-2006, 04:11 PM
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I just went thru a similar problem with mine. I was just about ready to pull the tranny and do a reseal when I noticed an unused pressure switch next to the dipstick tube. I removed it and used a pipe plug in its place, leak fixed. Mike
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Old 08-28-2006, 05:59 PM
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do you put the epoxy in the outside of the case?

I don't have the switch.

Augusto.
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Old 08-28-2006, 06:56 PM
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Case Porosity repair

here is the section from the service man.

Hope this helps! I've never done this myself just remembered reading the problem fix mya. I didn't like getting under it while running and test bit Be really careful with that.
BarryH
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Old 08-28-2006, 08:26 PM
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350 leak.

Check to see if there is a small hole in the center of output shaft U joint. I mean small (.030) Some have a vent and some have a small hole! Took me a while to find my leak. Good luck.
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Old 08-29-2006, 10:40 AM
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thanks for the instructions,

I've heard of the hole before but could not remember until now, thanks for the tip.

Augusto
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