Question about 1994 Jeep Grand Cherokee

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Process on changing an oil pump on a 4.0L 1994 jeep cherokee

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If you want to replace the pump due to low oil pressure, be aware that 99% of the time the pump isn't bad. Oil pressure loss is most associated with pressure bleed off at the crankshaft rod and main bearings due to wear. The pump is the first thing that gets oil and the last to not get it. If the engine runs out of oil there is far more damage than just the pump.
replacing the pump may seem to help for a few days but the problem will shortly return. That said, the only other reason to get to the pump is if there is hard carbon debris on the pickup screen causing an obstruction that cannot be dissolved using chems made for that (Amsoil engine flush, Rislone or even Marvel oil).
Good instructions for pan removal can be found in either chiltons or haynes manuals. The basics are: Jack up the vehicle form the body so the suspension is fully extended (You can get a bit more extension if you unbolt the shocks if you need to), remove anything in your way (starter, exhaust etc) Unbolt the pan and lower it. Unbolt the pump, put the new one on and clean all gasket surfaces. Replace gasket and reverse process to re-assemble.

Posted on Apr 24, 2010

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