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So, I think I need a new head.

Old 06-07-2013, 12:13 PM
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Thumbs down So, I think I need a new head...nope, ENGINE.

Here's the situation...

2000 Cherokee
155k miles
Clean oil, no major loss of antifreeze that I can tell.... but there is the head 'ticking/knocking' and 10psi at idle and this under the cap:

So I'm thinking I should start looking for a new head..... Where should I start? Ebay.. specialty shop? Junkyard? What specific head should I look/ask for?

TIA
Attached Thumbnails So, I think I need a new head.-img_20130606_185324.jpg  

Last edited by Tony_SS; 06-08-2013 at 08:57 AM.
Old 06-07-2013, 12:25 PM
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10 psi at idle? sounds like it will take more than a head to fix that.
Old 06-07-2013, 12:27 PM
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"no major loss of antifreeze that I can tell" (?)

clarify that^

Borrow a cooling sytem pressure tester and see if the system holds.
Check the oil pressure with a mechanical gauge.

Regardless, a new head won't cure the oil pressure/knocking problem, thats what new engines are for.
Old 06-07-2013, 12:51 PM
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Well that's not good...

Ok, where does one start looking for a new engine.. or should I have this one rebuilt and put a new head on it?
Old 06-07-2013, 01:53 PM
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Originally Posted by Turbo X_J
"no major loss of antifreeze that I can tell" (?)

clarify that^

Borrow a cooling sytem pressure tester and see if the system holds.
Check the oil pressure with a mechanical gauge.

Regardless, a new head won't cure the oil pressure/knocking problem, thats what new engines are for.
^^Start here^^
Also do a compression test on each cylinder. When you say you only have 10 psi, Is the you oil pressure?
Old 06-07-2013, 07:22 PM
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Well, I wanted to see what the Jeep had so I stepped on from a stop and BAM! And then there was smoke.. I pulled over and shut it off... had it towed home. There's nice size hole in driver side of the block. My buddy said the wrist pins go bad... but I'm thinking that was my knock... now the whole block is toast.
Old 06-07-2013, 07:33 PM
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That was easy.

Last edited by Turbo X_J; 06-07-2013 at 07:35 PM.
Old 06-07-2013, 07:34 PM
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Solves your question. Time for a new motor. I have a good block in this 01 parts jeep in my garage.

Last edited by XJGunny; 06-07-2013 at 07:41 PM.
Old 06-07-2013, 09:09 PM
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Can I use *any* 4.0 engine in my 2000? or does it need to be specific to a 00-01 Cherokee?

I found another long block locally. Says there's a knock and it needs main bearings.. would it be worth it to pick that up and have it rebuilt? Price seems right at $175...
Old 06-07-2013, 09:35 PM
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I'm pretty sure you can use the block. Where are you?
Old 06-08-2013, 08:22 AM
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Originally Posted by XJGunny
I'm pretty sure you can use the block. Where are you?
Washington MO, about hour west of St. Louis.
Old 06-08-2013, 08:50 AM
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Originally Posted by Tony_SS
Can I use *any* 4.0 engine in my 2000? or does it need to be specific to a 00-01 Cherokee?

I found another long block locally. Says there's a knock and it needs main bearings.. would it be worth it to pick that up and have it rebuilt? Price seems right at $175...



There are entirely too many good 4.0's out there to get one that needs work right off the bat.
Old 06-08-2013, 08:51 AM
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Can use an engine from a 99?

Mine has the coil packs... so I"m thinking not.
Old 06-08-2013, 08:53 AM
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Originally Posted by xjsnake


There are entirely too many good 4.0's out there to get one that needs work right off the bat.
I hear ya.. I would have it rebuilt.

But everything I see has all kinds of miles and is at least $1000... so I dont want to spend the labor to drop in another high mile engine.... I want to put in a rebuilt one.
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