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Old 01-02-2006, 10:23 AM
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TH350 oil pump sheared

While testing today I ground to a halt, no drive from my reconned TH350 box with manual body.

I took the box out and the two lugs on the oil pump drive cog have sheared off. It's only had 3 hours use. I haven't stripped it any further yet but wondered if anyone knew why this would happen?

I did overfill it by mistake, about a pint too much, other than that I can't see I have done anything wrong.

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Old 01-02-2006, 07:25 PM
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I would guess that the torque converter was not aligned with the oil pump gear when the trans was installed. If the slots on the torque converter don't line up with the pump, it causes damage to the pump gear. Inspect the torque converter hub, repair the pump and reinstall. Make sure the torque converter is in all of the way before you put the trans in. The quick method for this is to try and put your fingers behind the torque conv. (between it and the pump). If you can get your fingers in there, it is NOT installed all of the way, rotate and work it around until it goes in all of the way.

Good luck,
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Old 01-07-2006, 02:18 PM
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Thanks Rick

Repaired and reinstalled. The torque converter clearance was a 1/16 which I think must have been the problem. I made a shim between the engine and gearbox to give just over an 1/8 clearance.

So far so good.
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