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Old 06-19-2007, 01:28:49 PM   #1
transam617
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How to repair front pump seal and bushing TH350

Hey all,

I am a frequent poster over on www.thirdgen.org but have been reading posts on here for quite some time.

I have a turbo 350 that is leaking from the front pump seal and thought I would ask on here what all I should do to fix the leak.

I have gathered so far that replacing the seal itself is not a big deal once I have the transmission out but I am wondering if there is something else I should attempt to replace to make sure I dont have a leak when Im done.

Specifically I have read that a large clearance between the converter snout and pump front bushing can cause a leak through the front seal because the drain hole is small. Should I also look to replace the bushing while the trans is out?

I am not sure how much extra work is involved in changing this bushing. Do I have to remove the pump?

Thanks for any help.
James.
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Old 06-19-2007, 01:43:06 PM   #2
jakeshoe
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Yes the pump would have to be removed, seperated, bushing driven out, and a new one installed.

They are almost always worn. Check the sticky at the top of this forum for an idea of what you have to do.
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Old 06-19-2007, 07:55:21 PM   #3
transam617
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what parts and gaskets would I need to do this job? Do I need the pump gaskets and the bolt oring gaskets and thats it besides the bushing and seal?

Thanks.
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Old 06-19-2007, 09:44:49 PM   #4
jakeshoe
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Yes,
Pan gasket and filter. Pump o-ring and gasket, bolt seals, input seal, bushing, and fluid.
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Old 06-19-2007, 11:30:12 PM   #5
transam617
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Sweet - thanks for the concise help.
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Old 06-24-2007, 10:32:47 AM   #6
transam617
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Ok so I have everything apart (pump is out)

The bushing didnt really seem all that bad and the seal has good engagement all the way around.

I am beginning to think the leak was going around the seal where it fits into the pump. Is there any special kind of sealant I should put on the new one before I tap it in?

Thanks
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Old 06-24-2007, 01:57:17 PM   #7
jakeshoe
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Red Loctite or a very thin coat of RTV or aviation sealant.
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Old 07-08-2007, 07:19:25 PM   #8
transam617
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So when I got everything apart the parts seemed like they werent bad at all but replacing them seems to have done the trick and now theres no more leak!
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