Oil at pinion/ driveshaft flange - Alfa Romeo Bulletin Board & Forums
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post #1 of 10 (permalink) Old 08-16-2019, 05:52 AM Thread Starter
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Oil at pinion/ driveshaft flange

On my 1974 GTV, I separated the rear driveshaft flange at the differential input pinion flange in preparation for a new pinion seal. When I separated these flanges about a half cup of gear oil ran out. I am assuming its is gear oil anyway. I did not expect to find oil in this area and wonder if it is migrating up from the differential by way of the pinion threads or something else? Anything special to do on reassembly? I think my car may have been leaking oil at the Pinion/driveshaft flange in addition to the pinion seal. Maybe some RTV sealant on this flange at reassembly?

Rockiemosley--Currently 1974 Alfa Romeo GTV 2000 sunday driver and a Ford F-150 sport truck!
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post #2 of 10 (permalink) Old 08-16-2019, 05:56 AM
Richard Jemison
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Oil

Yep, it needs a bit of sealer on the splines & threads. Same with the output flange on the transmission.
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post #3 of 10 (permalink) Old 08-16-2019, 06:05 AM
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I wouldn't use RTV. I prefer Permatex #2.

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post #4 of 10 (permalink) Old 08-16-2019, 06:07 AM
Richard Jemison
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Sealer

I use the high torque Permatex Ultra Grey.

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post #5 of 10 (permalink) Old 08-16-2019, 07:03 AM
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I use the high torque Permatex Ultra Grey.
Is that what you use on the case joints as well?

ALFA ANDY
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post #6 of 10 (permalink) Old 08-16-2019, 10:36 AM
Richard Jemison
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Sealant for Trans cases, engine , and Diff housings

Is that what you use on the case joints as well?

I use it exclusively. It isn`t a deteriorating RTV sealant. Jim Steck seals his manifolds to the heads with this stuff (no gaskets)

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post #7 of 10 (permalink) Old 08-17-2019, 04:56 AM
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@Alfar7, I too use it on my transmission and differential cases. Intake manifolds? Really? The product manufacturer states not to be used in contact with gasoline.

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post #8 of 10 (permalink) Old 08-17-2019, 07:24 AM
Richard Jemison
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Ultra Grey and gasoline

I use only Ultra Grey exclusively on the gaskets I make for mounting Large Webers (48s & 50 DCOs) to my manifolds and have never had any deterioration AT ALL. My large ported and raised manifolds as well require custom cut gaskets which are bonded to the manifolds with Ultra Grey. Areas like the bottom pan, front covers and the front cover area of head gaskets gets the same sealant. This is a similar product to Yamabond and quite unlike typical silicon/RTV sealants.
It is a high torque sealant.

They make a Grey sealant that is "fuel" proof but it is a thin, slimey compound and I didn`t use it after buying it.

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post #9 of 10 (permalink) Old 08-17-2019, 08:18 AM
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@Alfar7, on the oil pans, upper or lower, and the front cover, do you use the supplied gasket AND the Ultra Grey, or just Ultra Grey?

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post #10 of 10 (permalink) Old 08-17-2019, 10:19 AM
Richard Jemison
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Gaskets

I use a thin film of Ultra Grey on the large thick upper pan gasket, and only Ultra Grey on the bottom pan, front cover and anywhere a thin paper gasket was once used.

Richard Jemison
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