AMC V8 --NO oil pressure with new water and oil pumps - Page 2 - JeepForum.com
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post #16 of 30 Old 01-14-2013, 06:07 AM
Matt1981CJ7
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I'm guessing the oil pressure bypass valve is missing, or installed backwards, in the new pump.

Also, I recommend checking the pressure plate to pump gears tolerances with plasti-gauge.

Matt

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post #17 of 30 Old 01-14-2013, 07:34 AM Thread Starter
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Quote:
Originally Posted by DuMatt1981CJ7 View Post
I'm guessing the oil pressure bypass valve is missing, or installed backwards, in the new pump.

Also, I recommend checking the pressure plate to pump gears tolerances with plasti-gauge.

Matt
Really helpful pictures. The valve is set up right, so I guess i'm left with rechecking clearances and pulling the oil pan to see what's going on.

Really appreciate everyone's help. I'm about at my wits end.
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post #18 of 30 Old 01-14-2013, 07:45 AM
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JD,

One other thing. Check that your bypass valve isn't stuck. You should be able to hear it sliding back and forth inside the housing.

I had to scrub the housing with a small wire brush (12 gauge shotgun cleaning brush), and lacquer thinner, to remove the build up inside and allow the valve to slide freely in the housing.

Matt
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post #19 of 30 Old 01-14-2013, 07:57 AM
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Good pics Matt!
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post #20 of 30 Old 01-14-2013, 01:38 PM Thread Starter
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Originally Posted by Matt1981CJ7 View Post
JD,

I had to scrub the housing with a small wire brush (12 gauge shotgun cleaning brush), and lacquer thinner, to remove the build up inside and allow the valve to slide freely in the housing.

Matt
The valve didn't slide freely at all, so I cleaned the tube using your 12g cleaning brush and it's pretty smooth now. More success with the drill this time. Still pretty low pressure.

I matched up the gears with another brand new set and the points of the teeth (where the gears mesh) are slightly shorter than the newest set. Almost like they've been sanded down a bit. Any last precautions I should take before I installing this new set?
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post #21 of 30 Old 01-14-2013, 01:56 PM
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The gears have enough play to press against the pressure plate. I think years of spinning against the plate will wear the gears some.

Maintaining the proper tolerance between plate and gears is critical to maintaining good pressure.

Matt
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post #22 of 30 Old 01-14-2013, 02:14 PM Thread Starter
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The gears....

Matt
Starting to look like I just wasn't careful enough with measuring clearances, but I don't have the heart to take it to a shop. I'll post with the new results soon. Thanks for everyone's help this far
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post #23 of 30 Old 01-14-2013, 02:23 PM
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JD,

If you don't have the proper tolerance, it's not difficult to create it. If memory serves the spec is .004-.006.

The Hammer did a nice write-up on this.

Matt
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post #24 of 30 Old 01-15-2013, 02:45 PM Thread Starter
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Installed new gears using hammer's writeup and it's looking good! I can get up to 20psi with my 18v power drill for a few minutes before the battery dies. Is there a necessary psi level/ duration for a good prime?
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post #25 of 30 Old 01-15-2013, 03:54 PM
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Not from what I observed on my 2 dyno sessions. Dyno guys spun her up to pressure for a few seconds, then fired her up.

I think the key is just getting some circulation thru-out the engine before you fire it. If I'm wrong, someone please correct me.

Nice job on the pump re-build, BTW.

Matt
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post #26 of 30 Old 01-15-2013, 05:29 PM
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With the problem that you are having I believe that I would remove the valve covers to verify good oil flow through the push rods with the drill.
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post #27 of 30 Old 01-15-2013, 05:59 PM Thread Starter
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With the problem that you are having I believe that I would remove the valve covers to verify good oil flow through the push rods with the drill.
I agree. I'll have to rent a higher powered drill.
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post #28 of 30 Old 01-15-2013, 08:26 PM Thread Starter
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Success!

I found an industrial drill that was able to prime the rods and give good pressure. Engine runs smooth again.

I'm glad I asked for help on the forum. Thanks, everyone who posted!
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post #29 of 30 Old 01-15-2013, 08:45 PM
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Oil problem

Quote:
Originally Posted by JDChris View Post
Success!

I found an industrial drill that was able to prime the rods and give good pressure. Engine runs smooth again.

I'm glad I asked for help on the forum. Thanks, everyone who posted!
I am glad you solved your problem,this Forum is awesome there is a lot of good people in here,I call it the brotherhood of JEEPS, :0)
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post #30 of 30 Old 03-05-2013, 05:53 AM Thread Starter
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Playing with pictures now. Hopefully nobody's still subscribed to this!
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