[W126 Coupe] (no subject)

[Dick Spellman]

Correction as per Dan Landiss:  2.0 to 2.5 ft lbs.  A really torque.  
You can adjust it accordingly if you still have some seepage.  The point 
being, if you over do it you'll defeat the purpose of the gasket.

Dick

Dick Spellman wrote:

> How are you securing the cylinder head cover?  Are you using a torque 

> wrench to 20-25 ft lbs (as I recall the spec is right in this range) 

> or are you just cranking these cover bolts down until they bottom out 

> so to speak?  Over tightening of the covers could have resulted in a 

> warped or cracked cover.  Try placing the cover on a known flat 

> surface to see if it's got a significant lift or uneven surface.  

> Personally, I'd reinstall the gasket using a torque wrench and do 

> cross bolt tightening from inside to outer where you say this is 

> definitely a valve cover gasket issue.  No need to stage torque just 

> go to 20-25 starting at a center cover bolt going criss-cross until 

> all are torqued to spec.  If you still have a leak then with caution 

> proceed with a gasket maker brush on application to the head and base 

> of rubber gasket in the trouble spot only.

>

> There is no need nor does MB recommend  any kind of sealant on that 

> rubber cover gasket.  You could use a brush on gasket maker as a last 

> resort but, do not use any kind of high temp silicone.  If that 

> sealant were to bead up to the inside of the rubber seal and break off 

> you could have more serious problems than a small oil leak.

>

> Are you certain the valve cover has no cracks of any kind?  Does the 

> mating surface on the head have any kind of indentation or blemish on 

> the surface?  And using a spray cleaner (like brake cleaner) and then 

> observing the area a while later you are absolutely certain it's the 

> rubber seal and not the head gasket that's the next mating surface 

> down from there where head and block meet?

>

> Dick

>

> JohnJayKimrey1 at aol.com wrote:

>> Dear bellamy:

>> No, it is the valve cover/gasket. I have removed and reinstalled two 

>> new gaskets and still have the leak between the rubber seal and alum. 

>> head.

>>

>>

>>

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