4104/spicer output shaft seal marking it’s territory

[Bountyflyer]

Good info thanks!!

My shaft is original. The nut came loose with my electric torque wrench. (That thing is awesome!) will try to buy a few today.
I use aero shell w80 in the tranny. Has lot of additives what is missing from synthetic oils, but again it's like the decision between Pepsi and coke...

Thanks again for the part number!

[dtcerrato]

I'm confused when you mention additives. The 4104 spicer doesn't like additives - that's why GM spec ed 50 wt aviation grade which is mineral oil w/o additives. I assume it has something to do with foaming among other things.

[dtcerrato]

By the way Bountyflyer you may want to confirm that nut torque during assembly because if you removed it with an electric impact - there probably wasn't enough torque on it which may be where your seal problem is. That output shaft bearing needs to be preloaded otherwise the shaft, bearing, & seal (among other things) will pay the price.

[Bountyflyer]

Im pettty good at confusing everyone. I meant to write that the aviation oil has no modern additives. I found aero shell w80 available so that's what I put in.

The Makita electric impact wrench has an incredible torque rating. I broke several bolts with it in the past. But now that you mentioned it, I did use a braker bar to get it loose. I can feel some output shaft looseness on bus#2 so a leak is understandable, but the one I just put together doesn't wobble at all just casually leaking.

I guess practice makes me perfect....

Did you use thread lock and sealant on the large nut? How did you torque it putting it on?

[dtcerrato]

Didn't use any thread lock during assembly. Used a large torque wrench on a 4 to 1 multiplier. I don't find the torque value for that nut in da book. Not certain what the torque is. I think I remember putting close to 1400 ft lbs on it to get it moving off. It would be wise to read through the transmission section of da book regarding the output shaft flange & nut.
You're running equivalent to a 40 wt oil. Some bus nuts run 30 wt in the tranny. Da book calls for 50 wt which is what we've always run.