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  #1  
Old 02-12-2007, 02:29 PM
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Question Rear Diff Sealant, hard setting or soft setting?

I am currently re sealing my rear diff. I have here some Permatex silcone gasket sealer in both the hard setting and soft setting varienties.

Which one should I use, or does it not matter? I cant find anywhere here or in the FSM that says one way or the other. Just to use silcone gasket sealant.

Thanks,
dd
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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
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  #2  
Old 02-12-2007, 02:36 PM
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I am a fan of a very light coat of Hylomar HPF.
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  #3  
Old 02-12-2007, 02:54 PM
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When I put the back cover on my diff I used a light coating of permatex copper (orange stuff). This worked well for me, I switch to the copper and seems to work very well.
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  #4  
Old 02-13-2007, 12:56 PM
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Quote:
Originally Posted by DieselBone View Post
When I put the back cover on my diff I used a light coating of permatex copper (orange stuff). This worked well for me, I switch to the copper and seems to work very well.
I guess if you have to stock only one silicone sealant, the copper is the one. but it is designed to be used in high heat applications. rear dif would be fine with ultra blue, or black even.
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #5  
Old 02-13-2007, 01:49 PM
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thanks for the responses.

so im still a little confused...here are the sealants i have lying around...which one would you use? im leaning toward soft setting.

Hard setting:
http://www.permatex.com/products/automotive/automotive_gasketing/gasket_sealants/auto_Permatex_Form-A-Gasket_No_1_Sealant.htm

Soft Setting:
http://www.permatex.com/products/automotive/automotive_gasketing/gasket_sealants/auto_Permatex_Form-A-Gasket_No_2_Sealant.htm

I have some of this too:
http://www.permatex.com/products/automotive/automotive_gasketing/gasket_sealants/Permatex_Hi-Temp_RTV_Silicone_Gasket_Sealant.htm

dd
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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
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  #6  
Old 02-13-2007, 01:55 PM
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of those three, I would go with the last one.
the first two are gasket supplements. not replacements.
John
neither would be my choice though. I would go with permatex Ultra Blue. Ultra black is OK too, but the black you have will work, it's just not as good, so be SURE you have cleaned both surfaces REALLY well, I mean after scraping, and wire wheeling, rub really well with acetone. GET VERY CLEAN! and let the goop partially dry after you put it on the Diff cover. then assemble loosely, and only torque after setting overnight.

John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #7  
Old 02-13-2007, 02:10 PM
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perfect - thank you. ill go out and grab the ultra blue variety tonight.
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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
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  #8  
Old 02-13-2007, 04:50 PM
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Quote:
Originally Posted by vstech View Post
of those three, I would go with the last one.
the first two are gasket supplements. not replacements.
To further clarify, they're also not "silicone." I dunno if Mercedes have any bolt threads that go into areas with oil or coolant, but if so, #2 is a good choice to use on those threads.
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