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  #1  
Old 04-08-2002, 09:47 PM
Adrian Johnston
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Silicone in Valve Cover

81 300 SD 150000 mi. There is black silicone all over valve cover gasket & inside cover. Do you use silicone on gaskets?
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  #2  
Old 04-08-2002, 09:53 PM
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By no means should you use silicone on mercedes valve covers. I have had people put silicone on the gasket for the front pumps also and cause big problems in the valve body. Just imagine it in your motor. Gives me chillllllllllllssssss.
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  #3  
Old 04-08-2002, 10:04 PM
Adrian Johnston
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Thanks it didnt look right. How about sheet metal box inside valve cover should that be sealed with black silicone ?
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  #4  
Old 04-08-2002, 10:42 PM
Adrian Johnston
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here is a pic of silicone around box is this supposed to be sealed?Or did it get sucked into place?
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Silicone in Valve Cover-dscf0044.jpg  
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  #5  
Old 04-08-2002, 11:25 PM
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Somebody sealed that to keep oil from getting in the air filter housing . This is normal nothing to really worry about .
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  #6  
Old 04-08-2002, 11:42 PM
Adrian Johnston
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should I reseal it? I pulled a little of it off cleaning it. thanks for your help.
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  #7  
Old 04-09-2002, 12:19 AM
Dan Rotigel
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I can't help you with the to seal or not to seal question, but I can tell you that the black stuff might not be silicon at all. To my understanding, there is a product made by loctite called 'loctite 5900' that MB uses to seal flange surfaces, and it resembles black silicon. It is safe for oil pasages, and gives a very good seal. It was discussed a time or two on the forum. I purchased some for about 25 dollars, and have found use for it here and there.

Regards,

Dan
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  #8  
Old 04-09-2002, 10:52 AM
moedip
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WARNING TO THE WISE: NEVER NEVER use silcone to seal valve cover gaskets. Most people put it on too heavy and bits and pieces come off on the inside and go down into your oil sump. I had a VW diesel that a guy brought to me with a weird problem. The oil pressure FELL when he revved the engine and went UP when he let it idle. After removing the oil pan I found the oil pump intake screen was almost completely plugged with bits of silicone from a valve cover job. The suction of the oil into the pump held the particles onto the screen and nearly ruined the engine. Took almost 2 months for the silicone to break off and make it's way to the pump screen. PROPERLY TORQUED VALVE COVER GASKETS IN GOOD CONDITION DO NOT NEED SILICONE!!
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  #9  
Old 04-09-2002, 11:24 AM
Potomac German Auto
 
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Location: Frederick, MD
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Post Silicone

I would tend to agree w/ everyone else. I would suspect that there should be any silicone applied anywhere to the top end like that. Although I have seen a hack job on a 104 engine where someone put silicone around the valve cover gaskets b/c they couldn't get it to seat properly. HACK !!!
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  #10  
Old 04-09-2002, 12:52 PM
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many many engins have been ruined by the injestion of silicone.Hylomar is the only thing to use if you need a sealer.
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  #11  
Old 04-09-2002, 01:03 PM
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Plus it gives off fumes captured by the PVC system that ruins the O2 sensor. [ if so equipped]
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  #12  
Old 04-09-2002, 01:43 PM
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not to be contrary here but sealants have come a long way since your old tube of blue permatex (had one in my toolbox that was 15 yrs old). quite a few manufacturers now use sealants like permatex "Right Stuff" and the MB approved loctite 5900, even on valve cover gaskets. the newer sealants are O2 sensor safe. you should specifically check the packaging for this if you plan to use it.

my last car was a Passat with the Audi V6. it had a pesky valve cover gasket leak - the dealer changed the gasket 4 times and never resolved the problem, even with a factory rep supervising the repair. i maintain it had to do with the design of the valve cover because it had curved surfaces to seal unlike traditional designs which just lay flat on the head. i was ready to seal it myself with Permatex "Right Stuff" until i decided to just give it up until the next car. the last year i had it, my engine bay was consantly smoking with burnt oil...
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