Date registered: May 2007
Vehicle: 1979 280SL, 1984 280SL
Location: Northwest Connecticut
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SOunds a little sketchy to me. What is your oil pressure gauge reading on start-up?
These oil pumps produce pressure instantly, and I can't imagine the split-second it takes to pressurize the galleries etc to have that effect. Also, there is always (well, on shutdown) a film of oil that forms the essential boundary layer btw the moving parts of your engine, regardless of pressurization.
You're right, the timing cover at the front is a royal pain to remove. I'm still an advocate of swapping in another tensioner before you do anything else.
Get yourself a stethoscope. Check out the water pump, belt tensioner, etc and try to better isolate the noise.
Erstwhile 107, 123, 124, 126, 210 owner
Current 107 280SL
Last edited by ChiefRider; 03-26-2012 at 04:17 PM.