915 input shaft seal leak-questions

[dweymer]

I rebuilt my trans, and was happy with the improvement, until I found my mystery oil leak was not my flywheel seal, but the input shaft seal(NOT the shift shaft seal). I rotated the shaft and the seal spins with the shaft. I would assume the seal should stay while the shaft turns. I am ordering a new seal, but was wondering what may have caused this so I don't repeat the issue. Also, would it hurt to leave that one in, and put the new one in almost as deep?

[DaddyGlenn]

Donnie,

Does this thread help?

[Porsche_monkey]

That shouldn't happen. How much force did it take to get the seal in during rebuild? Did it go in with finger pressure alone?

[dweymer]

I don't remember, yes Glenn that helped as did a search!

[Porsche_monkey]

The seal should require some force to insert. I would say you need to do some investigation and se if the bore is oversized for the seal.

A sealant MIGHT work, i.e. silicone.

[dweymer]

i just pushed the seal into the trans with VERY light pressure. The trans is coming apart tonight.

[Porsche_monkey]

If it is any consolation my Volvo camshaft seal is exactly the same. I pushed it in with finger presure, and now I'm praying it doesn't pop out. Of course it is easier to get at.

In the past I have successfuly installed a 0.005" 'shim' with red loctite in a similar situation, but is very difficult to do.

Options:
1) dis-assamble and have a machine shop bore the OD oversize and change the seal to a bigger size or press in a sleeve

2) using a center punch around the bore to give the seal some grip and then using a sealant

3) sealant only and instal the secondary seal

I would suggest #2.

[dweymer]

I think I may have excessive end play on the mainshaft....

[Porsche_monkey]

How does that make the seal loose? Did the seal slide forward?