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Old 03-17-2003, 09:15 AM
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Had the same problem on my 560 sel - drove me nuts for many months and several valve cover gaskets later - no cure. Problem? Warped valve cover! Put your valve cover minus gasket on a perfectly flat surface. If it can be rocked back and forth a little bit, it is warped. Overtightening the four cover bolts will warp these aluminum covers. Cure? Two choices. Buy new covers or do what I did - take the cover to a machine shop that can mill valve covers. They had to take off 7 mils from mine to get it flat again. Re-installed -MAKE SURE YOU DO NOT OVER TORQUE COVER BOLTS. Problem is gone. Cost was $70 Cdn. for the milling. Be sure to use new compession copper gaskets on the bolts when re-installing. Never over torque bolts - trust me!! Hope this helps. The puffing smoke is embarressing isn't it?

Last edited by moedip; 03-17-2003 at 09:21 AM.
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