Rear main seal
Senior Member
Joined: Oct 2009
Posts: 537
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From: NW Florida
Year: 1999
Model: Grand Cherokee
Engine: 4.0
Oil pump you mean? No, it's not an absolute necessity, I just did since I was already in there and was sitting at 175K miles. It's a mechanical pump and really isn't much that can go wrong with it (from what I understand, but could be wrong
).
).
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 2,613
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From: Summerville, South Carolina
Year: 99
Model: Cherokee
Engine: 4.0
Originally Posted by 4Doors
Oil pump you mean? No, it's not an absolute necessity, I just did since I was already in there and was sitting at 175K miles. It's a mechanical pump and really isn't much that can go wrong with it (from what I understand, but could be wrong
).
).
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 2,613
Likes: 0
From: Summerville, South Carolina
Year: 99
Model: Cherokee
Engine: 4.0
Originally Posted by 4Doors
Oil pump you mean? No, it's not an absolute necessity, I just did since I was already in there and was sitting at 175K miles. It's a mechanical pump and really isn't much that can go wrong with it (from what I understand, but could be wrong
).
).Senior Member
Joined: Oct 2009
Posts: 537
Likes: 2
From: NW Florida
Year: 1999
Model: Grand Cherokee
Engine: 4.0
Nah, nothing you can really do with it. Just make sure the screen on the pickup tube isn't filled with gunk and you're good to go. I said in my previous post that there isn't really anything that can go wrong with it and that's not exactly true, they do wear out eventually, but I think most of that would be due to neglecting oil changes.
And you're certainly welcome, God knows how much I've leaned on forums for help since moving off to college in '98. I had basic tools, I had basic manuals, but sometimes you just need someone with some experience to help out! My wife used to bug me about being so active in different vehicle forums even when we didn't have a problem, but now she understands that I'm fairly competent because I read a lot and I've saved a ton of money that we couldn't have afforded to spend on mechanics.
And you're certainly welcome, God knows how much I've leaned on forums for help since moving off to college in '98. I had basic tools, I had basic manuals, but sometimes you just need someone with some experience to help out! My wife used to bug me about being so active in different vehicle forums even when we didn't have a problem, but now she understands that I'm fairly competent because I read a lot and I've saved a ton of money that we couldn't have afforded to spend on mechanics.
Maybe past it now, ive done a few of these and to much droop can be an issue. the cherokee i have now has a 6.5 lift on it and it was the hardest pan to get off. my wj with 4 inches it fell out. I use a small flat screwdriver to start the old seal, u got to hit the metal center of it anyway. Once out of the other side, i take a dry blue terry wipe and press it on the seal and slide it right around, the dry towel gets a good grip on it. going back i oil it up good and use another dry shop towel to get a grap of it. lay it flat on the crank where it goes and just spin it into place.
Hope u get it
Hope u get it
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 2,613
Likes: 0
From: Summerville, South Carolina
Year: 99
Model: Cherokee
Engine: 4.0
Originally Posted by dbcox
Maybe past it now, ive done a few of these and to much droop can be an issue. the cherokee i have now has a 6.5 lift on it and it was the hardest pan to get off. my wj with 4 inches it fell out. I use a small flat screwdriver to start the old seal, u got to hit the metal center of it anyway. Once out of the other side, i take a dry blue terry wipe and press it on the seal and slide it right around, the dry towel gets a good grip on it. going back i oil it up good and use another dry shop towel to get a grap of it. lay it flat on the crank where it goes and just spin it into place.
Hope u get it
Hope u get it
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 2,613
Likes: 0
From: Summerville, South Carolina
Year: 99
Model: Cherokee
Engine: 4.0
Wow. Never thought this thread would hit 112 post! Thought it might be like 20 tops! Cool, hopefully this helps many people for a long time! Good job guys
Last edited by zombie jeep101; Nov 21, 2011 at 07:47 PM.
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 2,613
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From: Summerville, South Carolina
Year: 99
Model: Cherokee
Engine: 4.0
Nope. Not yet. Still need to get the upper seal out on throw the new ones in! Try to get a time where I can steadily work on it and when I'm not dead beat tired! Doesn't happen to often...
CF Veteran
Joined: Jun 2010
Posts: 1,220
Likes: 5
From: Arkansas
Year: 1987 & 1996
Model: Cherokee
Engine: 4.0
I've only had one oil pump fail.
It was a 351M Ford, and it locked tight and sheared the roll pin in the distributor and killed the engine with no damage.
Its easy enough to open the pump and use a feeler gauge and make sure the clearances are in check, and there is no excessive wear on the bottom plate.
Then fill it with vaseline when you put it back together that way its primed and will start pumping instantly. The Vaseline will dissolve in the heat of the engine and mix with the oil with no issues.
It was a 351M Ford, and it locked tight and sheared the roll pin in the distributor and killed the engine with no damage.
Its easy enough to open the pump and use a feeler gauge and make sure the clearances are in check, and there is no excessive wear on the bottom plate.
Then fill it with vaseline when you put it back together that way its primed and will start pumping instantly. The Vaseline will dissolve in the heat of the engine and mix with the oil with no issues.
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 2,613
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From: Summerville, South Carolina
Year: 99
Model: Cherokee
Engine: 4.0
Originally Posted by JamDeeper
What all have you tried? Be sure not to scratch ANYTHING. Have you been tapping or pushing?
Iv been tapping with a hammer and punch. It's not budging!
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 2,613
Likes: 0
From: Summerville, South Carolina
Year: 99
Model: Cherokee
Engine: 4.0
Originally Posted by UsmclovesXJ
What happens if u scratch?
The block or mess up the shaft. And that's def not good...!


