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KTL KTL is offline
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Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,413
I agree that if the oil pressure was fine prior to disassembly, it would seem reasonable to reinstall the same set of parts in the way it came apart. However the factory oil pressure gauge is a bit hard to obtain detailed before & after information since it's gradations of bars make it difficult to notice a difference in incremental pressures.

A mechanical gauge would be very helpful to use in testing the before and after. A mechanical AutoMeter or VDO gauge, an adapter fitting for the case, and a length of AN-4 hose is all you need and the whole assembly is not very expensive at all. You could plumb the mech gauge in a test-only way by just laying/hanging it in the engine bay temporarily. I've got all the pieces you need if you want to copy it or even borrow it.

The stuck piston is easiest, of course, when the case is apart. You can gently push it into the center of the case, to avoid scratching the bore. If the case is assembled, you can try a very strong magnet to grab the piston and pull it toward the threaded/exterior end of the bore.
Kevin L
Present: '86 Carrera, 89 Corvette Z51 6spd
Past: '87 Carrera, 79 911 SC widebody racecar
Old 10-24-2012, 08:31 AM
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