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Unread 07-15-2013, 02:11 PM   #1
pushrodswhy
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Oil pump sucking air?

Hi,
I just put in a 1998 Cherokee engine into my 01. I put a melling oil pump / screen in with the paper gasket and now every 40- 60 seconds I hear it suck air then the lifters tap for a couple of seconds (that's what it sounds like anyway). I let it idle for quite a while and so far oil pressure is good but it isn't going away. I did prime the pump with a drill before I started it up.

I'm going to pull the pan again and take a look, is there any trick to getting these screens/pumps to seat properly? I know if you take the screen out again you have to get a new one since its an interference fit. (couldn't they just use a bolt to hold it on like everyone else?)

Also gasket or no gasket?

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Unread 07-15-2013, 09:52 PM   #2
79chiefs
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IIRC the engine changed in 01. What pump did you use? What engine did the parts come off of? Did you reuse parts from your 01 in the 98?
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Unread 07-16-2013, 05:41 AM   #3
cruiser54
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Some of the oil pumps interfere with a block casting, and feel tight when they're actually not fully seated. Worth taking a look.
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Unread 07-16-2013, 06:27 AM   #4
CCKen
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This may be what cruiser54 is talking about:

http://www.jeepstrokers.com/forum/vi...hp?f=34&t=2671
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Unread 07-16-2013, 06:40 AM   #5
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Quote:
Originally Posted by CCKen View Post
This may be what cruiser54 is talking about:

http://www.jeepstrokers.com/forum/vi...hp?f=34&t=2671
That's EXACTLY what I'm referring to.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 07-16-2013, 03:22 PM   #6
pushrodswhy
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I used a brand new Melling pump and screen for a 1998 engine. Should be the same parts though. I have seen that post and checked when I installed it. Looked plenty tight to me but I used the gasket which would raise it up a bit. I'm leaning towards the gasket or the pickup screen being the culprit. I'm going to get it all apart and try to stick feeler gauge in there w/out the gasket. I'm worried that the pickup screen is leaking because I had to turn it slightly to get it under the pan and line the bolt up (which doesn't line up properly).
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Unread 07-17-2013, 06:13 AM   #7
cruiser54
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Brand new or not, I'd be looking for the interference at the mounting area.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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