Differential seepage

  • ilikescars
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04 Feb 2017 16:53 #32427 by ilikescars
ilikescars created the topic: Differential seepage
I noticed on an original, untouched Auburn dual ratio differential that there is some seepage that takes place around the tin cover. And the buildup of crud is substantial. Since the bolts that fasten this rear "derby hat" are subjected to gear oil, wouldn't it make sense to have copper crush washers on them?

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  • mikespeed35
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05 Feb 2017 05:08 #32429 by mikespeed35
mikespeed35 replied the topic: Differential seepage
All of the cover bolts need to be sealed in some way. I have tried to seal my cover multiple times with various methods and so far have been unsuccessful in doing so. I have no problem sealing engine oil pans but this cover eludes me.
CORDially Mike

Mike Huffman

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05 Feb 2017 12:33 #32430 by Curt Schulze
Curt Schulze replied the topic: Differential seepage
Has anyone tried Penrite in the diff? It is the best thing since sliced bread for the steering box.

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt

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05 Feb 2017 17:26 #32431 by 1748 S
1748 S replied the topic: Differential seepage
I think the best way to seal any bolt threads from leaking is to first get it absolutely clean. Brakclean works well for me. the most any RTV will seal the threads. The key is a clean surface so the rtv can attach. My RTV choice is permatex ultra copper plus. It is heat and oil resistant. Find it everywhere. smell horrible but works great.

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06 Feb 2017 03:53 #32434 by ilikescars
ilikescars replied the topic: Differential seepage
I think you're correct, 1748. I just noticed today that another Auburn of mine has been sealed with a grey RTV and there is not a drop showing.
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10 Feb 2017 14:53 #32482 by ilikescars
ilikescars replied the topic: Differential seepage
Update: I drained the diff and cleaned off all the mating surfaces & bolt holes with acetone. Used a small rat-tail brush to clean the threads, too. Made sure the surface where the bolts meet the "derby hat" flange was clean of paint. Then I used Ultra Black RTV to reassemble everything (no gasket was used) and smeared a small amount of RTV onto the bolt threads. Refilled the diff. So far, no leakage seen after 24 hours

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