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Old 09-30-2004, 10:51 AM
ctaylor738 ctaylor738 is offline
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
I'm no pro, and I assume your mechanic has access to the same manuals I do.

The pressure relief valve is in the oil pump, so presumably it was replaced when the new oil pump went in?

The oil flow is straight to the oil pressure sender in the filter housing via a galley - it is conceivable (barely) that the galley could be plugged or cracked and causing reduced pressure at the sender. Flow to the guage could also be blocked. Beyond that I think the only place that would drive the pressure to zero would be the main bearings. And if that was happening I would expect some noise. No oil stream to the cam lobes would confirm it.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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