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Old 04-02-2003, 11:12 AM
mikaelw2001 mikaelw2001 is offline
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Join Date: Oct 2002
Location: Vanersborg, Sweden
Posts: 99
1984 500 SEL Compression results strange

Hello again Friends,

I just did a compression test on my 1984 500 SEL. On the right bank every cylinder showed values of 180-185 PSI but on the left bank they were all 140-145 PSI.

When I added oil the values went up with 20 PSI which looks kind of normal to me.

What I think is a bit strange is that the higher values are on one side and the lower on the other.

Does anyone have any thoughts of this is normal.

I kind of suspects that maybe the valvetiming is NOK on the left side. I did change the cam chain and the tensioner and guides a couple of months ago and the timing marks did not line up as the should (when the cam timing marks lined up, the crank showed 14 BTDC degrees). Before I changed the tensioner etc the crank showed 28 BTDC degrees. I tried to offset the timing with one tooth and then the timing at the crank showed about 5 ATDC degrees but the engine hardly ran and was making a lot of valvetrain noise so I set everything back as it was timed before the parts exchabge.

Please advise.

Mikael Westerberg
1984 500 SEL
Vanersborg, Sweden
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