OM EGR gasket.

[ALFAitalia]

I'm replacing the leaky gasket on my OM642 EGR valve.....its leaking coolant both internally and externally. My fault as I re-used it which I can normally get away with on steel gaskets....!

Anyway its not a great design due to how little metal there is between the various holes. So I was just wondering if anyone uses any sort of sealant top make sure it does not leak again. Ok you could argue that it did not leak before I removed it and so the new one (which is a genuine MB one) so it wont leak now......but is there a sealant I could use as well? I'm guessing that due to the heat an RTV silicone based one would be a no go.... how about a smear of Blue Hylomar?

Note how little metal there is between the small coolant hole and both the fixing bolt hole and the valve aperture.

 

[BlackC55]

I use the genuine MB sealant. Its excellent. Its made by Loctite I think. I call it my insurance policy as I do tend to use it in some applications as well as the gasket. Certainly on a EGR gasket.

 

[ALFAitalia]

Thanks. Do you know what sort of sealant it is?......Silicone, non setting, etc

 

[BlackC55]

Silicone. A003 989 982 010

 

[ALFAitalia]

Thanks......

 

[BlackC55]

Silicone. A003 989 982 010

There is a method on applying it.

When applied you must let it go from shiny to matte. That's the solvent evaporating. Not many people know that.