Valve Cover Tightening Sequence and n/lbs - Mercedes-Benz Forum
 
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#1 (permalink) Old 12-01-2008, 07:45 AM
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Valve Cover Tightening Sequence and n/lbs

I'm going to replace a valve cover seal and I was wanting to know what the tightening sequence was for the bolts.

Thanks in advance!!!!!
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#2 (permalink) Old 12-01-2008, 06:59 PM
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Forgot to ask what nanos/pounds to tighten bolts. Any know?

Thanks in Advance...
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#3 (permalink) Old 12-01-2008, 07:11 PM
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It is 9 Nm for the valve cover and 8 Nm for the coils. WIS does not show a tightening sequence. At the dealer most people just use 1/4" air ratchets to tighten down the valve covers, I have yet to see a valve cover break. Are you going to re-seal the chamber on top of the valve cover while you have it off? That is usually the source of the leak and not the bottom gasket.
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#4 (permalink) Old 12-01-2008, 07:42 PM
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I didn't see any oil leaking out of the top chamber on the valve cover.
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#5 (permalink) Old 12-01-2008, 07:47 PM
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Thats good then, one less thing to worry about. Sealing the top chamber is what takes the most time and the other gasket is easy.
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#6 (permalink) Old 12-02-2008, 07:08 PM
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Rule of mechanics is to go in a spiral pattern starting in the center, going outwards. Clean both surfaces and remove all leftover material, Good luck
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#7 (permalink) Old 12-05-2008, 01:24 PM
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I see the specs above...which I didn't have :-(

Do not over tighten the bolts in the center of the cover (the long skinny ones). They break easy! Found out the hard way; dangit!
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