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Old 02-21-2002, 06:38 PM
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silicone sealant?

I have a very slight head gasket leak. One mechanic has suggested, as a first step, to re-torque the head bolts and then apply to the leak area a high-temperature silicone sealant. I saw one sealant advertised as being impervious to oil, and which will withstand temperatures to 400 degrees F. Other than the small leak, there's no reason to pull the heads, etc. The leak is only to the outside of the engine block. There's no mixing of oil and coolant.

Has anyone tried these sealants? The mechanic believed this would most probably fix the leak.
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Old 02-21-2002, 07:06 PM
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I personnaly would not entertain very high hope on this proposed solution but since the cost is probably very low, why don,t you give it a try. Keep us posted. if this thing works, maybe us, The leaky Mercedes community, can invest some money in a silicone Company.
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Old 02-21-2002, 07:48 PM
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Join Date: Jul 2001
Location: Western Michigan
Posts: 1,080
My 1990 300E (sold now) had a bad leak around the timing cover (enough to see drips on the garage floor overnight). I used a liquid rubber product (got it from Pep Boys) to spray around that area and the leak was very minimal after wards. I first cleaned with brake cleaner and then sprayed the liquid rubber. After a year, I cleaned the area again and re-applied.
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Old 02-21-2002, 10:23 PM
Fimum Fit
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Rather than silicone

Get a product called "Permatex Form-a-Seal Leak Repair." Then follow the directions on the spray can exactly. Don't expect it (or anything else) to hold against any serious oil pressure, though.
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Old 02-21-2002, 10:28 PM
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Join Date: Jul 2001
Location: Western Michigan
Posts: 1,080
Fimum Fit:

That is the product I used.

It works pretty well but it is not a permanent fix.
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Old 02-22-2002, 08:36 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
External oil leaks on cylinder head areas SHOULDN'T blocked off! These leaks are due to HIGH oil pressure trying to go somewhere earier than going thru the engine. ON this type of leak the oil will find other places to go & that CAN be into the combustion chambers.
Have seen this happen on several engines & one 1991 350sdl bent a ROD on cylinder due to this!!
Also the head bolts SHOULD never be retorqued as they are STRETCH(torque to yeild) bolts & IF they are loose then the engine has been OVERHEATED.
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Old 02-22-2002, 09:16 AM
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I should have mentioned my car is a 73 450sl. I don't think the stretch head bolts were used until later.
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