I'm going by Mercedes spec. If you measured 400 psi on one engine, the possibilities are:
1. your gauge is wrong
2. the engine has carbon buildup in the combustion chamber, thus raising the compression ratio.
Quote:
Originally Posted by vstech
in my opinion, none of those numbers are healthy. a warm engine should have over 400 on the pots.
it's possible that the valves need further adjustment. if they were tight, they could have damage that caused them to seat further after you drove it after the first adjustment. readjust the valves and try again...
good luck!
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