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fastblackmerc
10-22-2014, 07:29 AM
Going to change out my rear end cover when I upgrade to 31 spline axles, spider gears, "S" spring and carbon clutches. Any recommendations for a sealer I can apply to the inside of the new aluminum cover? Obviously it will need to withstand oil and some heat.
martyo
10-22-2014, 08:05 AM
Clear Powdercoat or anodize.

For my money, I would clear powder coat it.
fastblackmerc
10-22-2014, 09:36 AM
Clear Powdercoat or anodize.

For my money, I would clear powder coat it.

Didn't think of that. Will check it out.
SOSA03
10-22-2014, 11:21 AM
Theres a sealent thats just for diffs
fastblackmerc
10-22-2014, 12:00 PM
Clarification.... I'm looking for something to seal the aluminum, not to make a gasket.
Marauderjack
10-22-2014, 02:37 PM
Why do you need to "seal" aluminum Jim??:confused:
fastblackmerc
10-22-2014, 02:45 PM
Why do you need to "seal" aluminum Jim??:confused:

The current aluminum cover is seeping.
Marauderjack
10-22-2014, 03:07 PM
Wonder why??:eek:

If it's that porous I'd replace it since the strength cannot be all that great??:confused:
fastblackmerc
10-22-2014, 04:17 PM
Wonder why??:eek:

If it's that porous I'd replace it since the strength cannot be all that great??:confused:

That's why it's being replaced.
SOSA03
10-22-2014, 08:37 PM
So there there is a crack
MOTOWN
10-22-2014, 09:20 PM
since its the inside of the aluminum diff cover you are concerned with sealing I would use POR15
Zack
10-22-2014, 09:55 PM
Por15 does not adhere well to anything other than rusty surfaces....from my own experience
MOTOWN
10-22-2014, 10:25 PM
Ive used it on many floorboards with no rust and its still intact , ive only been using it over 20 years!
J-MAN
10-23-2014, 02:41 AM
A difference in opinion from knowledgeable people. Who would have guessed. Life goes on, no hurt feelings.
Marauderjack
10-23-2014, 02:48 AM
Why would any company manufacture a quality piece of cast aluminum that requires sealing before use??:confused:

Sounds like you just got a bad one before Jim!!:argue:
fastblackmerc
10-23-2014, 04:24 AM
Por15 does not adhere well to anything other than rusty surfaces....from my own experience


Ive used it on many floorboards with no rust and its still intact , ive only been using it over 20 years!

I believe POR15 would stick to anything that is rough or porous like an aluminum casting.


Why would any company manufacture a quality piece of cast aluminum that requires sealing before use??:confused:

Sounds like you just got a bad one before Jim!!:argue:

Very possible!
Zack
10-23-2014, 07:16 AM
The inside of the diff cover is rough cast?
Thats odd, they are usually smooth (finished)

POR15 will stick to cast aluminum no doubt.
JohnE
10-23-2014, 09:29 AM
Don't put any coatings on the inside of the cover that could flake off. There is a lot of velocity of the gear oil when running fast down the road. Most paints would just be hydro-blasted off of the cover. And then you'd have paint getting into all of the bearing and gear surfaces. Not good.


Just replace the cover and properly seal it with RTV.



*Also check to make sure you don't just have a front seal leak, causing the rear to be coated with oil.