Posted by Bob M on June 12, 2012 at 19:47:00 from (69.207.87.163):
In Reply to: Super H Oil Pressure posted by Global Warmer on June 12, 2012 at 18:40:42:
A good SH engine should carry 55 - 60+ psi cold. Most likely the problem's a worn or warped oil pump cover. But it could also be worn crank/camshaft bearings. (It's NOT caused by the non-detergent oil.)
I recommend this: Drop the pan and remove the cover from the pump. If you find wear grooves from the pump gears, if the cover is not absolutely flat or if the gasket is blown out you've found the problem. But if the oil pump is OK you'll need to get inside the engine to service the bearings.
If you determine the problem is the pump cover, grooves or a minor warp can be removed by carefully working the cover on abrasive cloth laid on an absolutely flat surface (machine table or sheet of plate glass).
While the pump is apart check the pressure relief valve to make sure it's not stuck partially open. Use a NEW gasket when replacing the cover (be careful - it's very thin and tears easily!). Then torque the capscrews evenly and equally so you don't warp the cover/pump body.
Tip: Switch to 15W40 oil. It will give better with oil pressure when hot, and it won't promote sludge accumulation as does non-detergent oil.
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