1999 Jeep Cherokee Logo
Posted on Dec 16, 2010
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Primer on an oil pump for a 1999 jeep ? put new oil pump on but its not priming and not sure what to do

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  • Jeep Master 6,982 Answers
  • Posted on Dec 16, 2010
Anonymous
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Best way to draw a prime is to put a long screwdriver blade (no handle) attached to an electric drill down into the oil pump drive slot (distributor removed). I actually use a distributor that has the top cut off without the cam gear, and just attach the drill to the shaft, but the screwdriver works pretty well too.
Only other option is to pack the inside of the pump with light grease, but that would require pan removal and I doubt you want to do that!!
Many pumps are replaced because of low pressure but the cause is generally a bad bearing...If that's the case you may find it difficult to prime.

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Had the pressure bypass valve malfunction on my 2.5 jeep put new oil pump in and with 45lbs. Oil pressure motor still sounds dry of oil,what gives?

it's not priming.
that grease trick helps.
is this some china pump off fleabay or a real jeep pump..???
did you do the below.:
1: the grease sure. and then prime the filter and the gallery behind the
filter.
2: With fuel and spark defeated, and spark plugs removed then with pressure gauge attached to sender port, did you crank it to get max pressure (my guess is this is the step you are posting on.)
i never start any engine, (after majors) unless i get #2 to work first the number 3, which is top end oil checks.

the pump is no priming.
In pro shops they make up a priming tool. so new engines are never
started, 1st time dry, ever.
one way is just a tank full of oil and shop air, and 2 valve.


maybe the new pumps relieve valve is stuck open, fully.
i rebuild my own classic engines, after all that work !!! i never
ever, skip these steps.
and for 100% sure, good pressure, and top end oiling on any major work.
one of the top brand pump makers. VIDEO
http://www.youtube.com/watch?v=tOYLlr8uQ8k
NEVER !
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