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post #1 of (permalink) Old 09-20-2005, 05:34 PM Thread Starter
Can't Get Enough
jeeperjohn's Avatar
Join Date: Sep 1999
Location: The Plywood State.... Florida
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Oil pump failures.

How common are they? Who has a for real oil pump failure? What symptoms did you have?
My example:
1988 YJ
New bearings rings and oil pump 1 year ago (ran fine in truck indicated middle of scale on oil pressure gauge when pulled out)
High volume oil pump
Otherwise stock
Holley oil pressure switch was shutting electric fuel pump off at idle (Holley indicates it should switch off at 6 PSI)
Jeep OP gauge was showing ~30 PSI hot at idle
Mechanical test gauge showed 5 PSI hot at idle [img]/ubbthreads/images/graemlins/thud.gif[/img]
Externally pump looks undamaged, shaft turns free
Pulled cover plate off oil pump, rotors look good but the relief valve is stuck ~1/3 open.
installed new oil pump 45 psi hot at idle. [img]/ubbthreads/images/graemlins/burnout.gif[/img]
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