W115 Rear Differental Cover Gasket - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 10-03-2011, 04:36 PM Thread Starter
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Question W115 Rear Differental Cover Gasket

As the topic suggests, my 1972 220/8 has a leaky rear differental cover.

I called my local dealership and was told that there is no gasket, they just use silicone sealant? That doesn't sound like the MB way to me.

Can anyone confirm this is correct or provide a part # for the gasket if it exists?


- Steve
1989 560SEC AMG Euro / 1990 300SE Euro / 1991 500SL Japan / 1997 S500 USA
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post #2 of 9 (permalink) Old 10-03-2011, 05:32 PM
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In this instance, that is the MB way. The cover is a machined-fit so very little gasket material is needed. I've taken the cover and lightly sanded it true with 400 grit on a piece of glass to make the fit more precise. Probably not needed, though.

1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
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post #3 of 9 (permalink) Old 10-04-2011, 12:19 AM Thread Starter
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Thanks for the info. The illustration shows what looks like a gasket but I guess it is just the cover plate.

What material did you use to re-seal it? RTV?

- Steve
1989 560SEC AMG Euro / 1990 300SE Euro / 1991 500SL Japan / 1997 S500 USA
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post #4 of 9 (permalink) Old 10-04-2011, 07:08 AM
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Yep, just a very thin coating.

1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
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post #5 of 9 (permalink) Old 10-04-2011, 07:34 AM
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Two precision machined surfaces do not need a gasket because it will crush and distort the less rigid part.

Throw the RTV away or use it on items like sheet metal to machined assemblies. the stuff has caused more problems than solved.

These cars have no use for the stuff, anywhere.

MBZ has a sealer made for this purpose, (and so does Permatex).

The oil on a differential usually comes from the pinion seal and migrates all over due to air flow and time.

Brian O
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post #6 of 9 (permalink) Old 10-04-2011, 10:20 AM Thread Starter
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OK, I will contact my dealership.

I was quoted $29 for a tube of sealant.

- Steve
1989 560SEC AMG Euro / 1990 300SE Euro / 1991 500SL Japan / 1997 S500 USA
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post #7 of 9 (permalink) Old 10-04-2011, 02:47 PM
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Quote:
Originally Posted by bostosh View Post
Two precision machined surfaces do not need a gasket because it will crush and distort the less rigid part.

Throw the RTV away or use it on items like sheet metal to machined assemblies. the stuff has caused more problems than solved.

These cars have no use for the stuff, anywhere.

MBZ has a sealer made for this purpose, (and so does Permatex).

The oil on a differential usually comes from the pinion seal and migrates all over due to air flow and time.
No offense, but this attitude drives me crazy. This is a non-critical application and $30 for a tube of sealant is just a waste of money IMO. Just use a thin enough application of RTV so it doesn't squeeze out and be done with it.

1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
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post #8 of 9 (permalink) Old 10-04-2011, 06:22 PM
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Thin is the proper usage method. More is not better.

You are correct my attitude sucks,

I have followed up after those RTV users.
And it oozes into the insides of motors and transmissions and differentials without hardening ever.

And realized that I am not as smart as a team of German engineers who put things together before RTV was invented and those who put room temp vulcanizing blue stuff into those stinky acetic acid smelling tubes.

I do use the cheaper Permatex version.

Brian O
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post #9 of 9 (permalink) Old 10-07-2011, 11:40 AM Thread Starter
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Thanks for the insight. I am going to tackle this job on the weekend.

- Steve
1989 560SEC AMG Euro / 1990 300SE Euro / 1991 500SL Japan / 1997 S500 USA
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