Leak free differential cover gasket - JeepForum.com
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post #1 of 19 Old 08-17-2017, 12:14 PM Thread Starter
cj7ole
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Leak free differential cover gasket

What is the best combo of gasket/sealant for a leak free AMC 20 differential cover? Kentrol stainless cover. I'm tired of it marking its territory. Changed the fluid last fall, used a cork seal and black RTV, now have a very slow drip, a few drips per day.


'84 CJ7, '07 5.3 LMG Chevy, D300, 4L60e, 33's, 4.10, rear Detroit Locker, FG Tub, HOK Tangelo Pearl
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post #2 of 19 Old 08-17-2017, 12:30 PM
82Laredo-7
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I don't use a gasket, just a nice bead of grey rtv, let it sit for 5 minutes or so, then put the cover on.

82 CJ7 Laredo 4.2L w/T5, Weber 38, 3:30's w/32's
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post #3 of 19 Old 08-17-2017, 12:42 PM
Blob
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Lubelocker - hands down IMHO. No fuss, no muss (or mess), and no leaks.
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post #4 of 19 Old 08-17-2017, 01:25 PM
80cj
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I use a cork gasket and glue it to the housing with Permatex Aviation form a gasket. Been leak free for about 10 years.
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post #5 of 19 Old 08-17-2017, 01:26 PM
fromme
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If that cover has a very smooth and slick mating surface, scuff it up before resealing.
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post #6 of 19 Old 08-17-2017, 01:59 PM
gunsanddaisys
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Know your torque values. Cork gaskets have no issues if both surfaces are flat and the proper torque values are used. They typically need no more than 9 ft lbs, though I don't know the exact value for a different cover. Too much torque lifts the gasket between fasteners and causes leaks.
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post #7 of 19 Old 08-17-2017, 03:44 PM
skizriz
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Lubelocker - hands down IMHO. No fuss, no muss (or mess), and no leaks.
Money well spent. Especially if you are in to them often, as I am.
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post #8 of 19 Old 08-17-2017, 04:08 PM
John Strenk
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Did they change through the years?

I think mine just had a rubber ring like an o ring.

No leaks.


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post #9 of 19 Old 08-17-2017, 07:28 PM Thread Starter
cj7ole
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Both the cork and rubber are available cheap (under $5) through most parts guys. The LubeLocker is in another whole world at $22. Hope it is worth it, I just ordered one. And bolt torque appears to be 20 ft-lbs. Thanks everyone for your input.

'84 CJ7, '07 5.3 LMG Chevy, D300, 4L60e, 33's, 4.10, rear Detroit Locker, FG Tub, HOK Tangelo Pearl
Build: http://www.jeepforum.com/forum/f22/ole-jays-cj7-5-3-chevy-swap-1287392/
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post #10 of 19 Old 08-17-2017, 07:47 PM
CSP
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Double check that the torque value isn't 20 inch-lbs.
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post #11 of 19 Old 08-17-2017, 07:47 PM
80cj
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Quote:
Originally Posted by John Strenk View Post
Did they change through the years?

I think mine just had a rubber ring like an o ring.

No leaks.
Yup, same as mine. Rubberized cork ring,
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post #12 of 19 Old 08-17-2017, 10:13 PM
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LubeLockers here as well

Ed
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
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post #13 of 19 Old 08-18-2017, 06:17 AM
keith460
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I use a cork gasket and glue it to the housing with Permatex Aviation form a gasket. Been leak free for about 10 years.
Same as me, and is always leak free.

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post #14 of 19 Old 08-18-2017, 07:45 AM
KevinCJ7Jeep
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Give Permatex the right stuff a try.
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post #15 of 19 Old 08-21-2017, 11:55 AM Thread Starter
cj7ole
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Just finished it. Drained and saved the almost-new fluid. Cleaned the diff surfaces with napha to degrease. Blasted the stainless cover with brake cleaner to degrease. Flattened the cover gasket surface on my 6"x48" stationary belt sander followed by 180 grit on a flat piece of hardwood. Used a screwdriver and putty knife to scrape old goop off the diff. Then flattened it (it was rusty) with the 180 grit-on-a-stick. Hit with with a small flap wheel on my drill. I noticed that the inner row of rubber on the LubeLocker didn't hit the surface, it overlapped the recess that the old cork gasket sat in and I could see daylight at the bolt holes. Not good, so I got a new FelPro cork gasket to fill that area and held it in place with Permatex anaerobic gasket maker. Then I installed the LubeLocker dry and torqued it to 20 ft-lbs in two steps. Filled it with a new quart of Valvoline Synthetic 75W-90 GL5 lube followed by 1.4 quarts of the saved and filtered lube. (Paint filter, 190 micron). If that doesn't fix the drip, I don't know what will.

'84 CJ7, '07 5.3 LMG Chevy, D300, 4L60e, 33's, 4.10, rear Detroit Locker, FG Tub, HOK Tangelo Pearl
Build: http://www.jeepforum.com/forum/f22/ole-jays-cj7-5-3-chevy-swap-1287392/
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