Name that Leak - Please?

[hoyabob2003]

I've been struggling with fluid leaking from my car since not long after I got it back from the shop.

The patient is a 2004 S 6-Speed

Transmission was rebuilt by G Box less than 5000 miles ago
IMS, RMS, Flywheel and Clutch replaced by a very reputable shop 500 miles ago

200 miles ago I started noticing drips on my garage floor. Cleaned her up real good and it became clear that the leak was coming from the bell housing.

Joe Gibbs DT 40 and the Porsche transmission fluid smell a lot like each other and have the same yellowish color when new - compared them bottle to bottle.

So I got myself a 4 post lift and a transmission stand. Pulled the tranny and here's what I found:




Fluid pooling in the bell housing



Behind the flywheel appears to be dry.

Is there an obvious diagnosis or should I proceed to pulling the clutch and the flywheel? What say you experts who are smarter than I? Thanks for the help!

[hoyabob2003]

...and on further inspection, the inside of the bell housing is coated with an oily substance....if that helps. Thanks!

[BYprodriver]

I wonder if the throwout bearing guide collar inner seal was replaced? I would think G-Box would have done that. Have you talked to them ?

[hoyabob2003]

Just pulled the tranny today. I'll look at my receipt from gbox. Thanks!

[hoyabob2003]

just checked my gbox receipt. There are actually 2,500 miles on this rebuild that included the os-Giken lsd. The following seals were replaced: main shaft seal, differential side seal and shift arm seal.

[hoyabob2003]

Just spoke to GBox. They were very helpful. I was told that replacing the input shaft seal is pretty straightforward - pick the old one out - tap the new one in - just not too far or it will fall into the transmission. Does this sound about right to everyone? Any pointers?

[Gelbster]

GBox needs to give you the tech advice on this, not us !
For example, you need to examine the input shaft for wear/marking where the lip of the seal fits.If there is any discernible marking ,discuss with GBox because fitting a new seal may be futile.
If the marking is slight, can it be 'improved' ?
If it can, is it possible to fit the new seal to a slightly different depth ? GBox to advise.
Similar issues arise with the RMS and sometimes experts(not me) suggest setting the new seal to a different depth to avoid repeat leak problems.
Let us know what happens?

[Smallblock454]

Hello,

the OEM seal has these fine grooves. The after market one on the photos not. Besides material quality this difference in design makes a big difference in how good it can seal.

Regards, Markus