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Unread 01-23-2011, 09:27 PM   #1
chrisdzwle
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just bought a 2000 major motor problems need help

I just bought a 2000 sport with 4.0 and 127000 miles, ran great for about a week. i changed the oil and put in lucas oil stabilizer. then i got a very loud knock. brought it to my friends shop and he said i have a spun rod bearing and cracked cylinder head. what do you guys think i should do? thanks

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Unread 01-23-2011, 09:30 PM   #2
Bama1987
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4.0 or 2.5?
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Unread 01-23-2011, 09:31 PM   #3
chrisdzwle
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4.0
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Unread 01-23-2011, 09:33 PM   #4
Bama1987
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Sry didn't see sport up there buy a new head and fix the rod replace them all while ur at it. My buddy got a complete 4.0 fo 400 replace the whole thing if u can find a deal/ good junkyard find
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Unread 01-23-2011, 09:33 PM   #5
gixxerphil
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stroker
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can you get a good pic of your muff set up ?
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Unread 01-23-2011, 09:34 PM   #6
Bama1987
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Or trade with me I'll pull it out and put a 302ford in it. Haha
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Unread 01-23-2011, 09:36 PM   #7
Bama1987
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Or that. But idk hes an auburn fan
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Unread 01-23-2011, 09:40 PM   #8
chrisdzwle
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if i decide to fix it myself what year heads can i use on my 00 block?
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Unread 01-23-2011, 09:50 PM   #9
Bama1987
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Not 100% sure but I would imagine 97-02 i think. But it would probly be cheaper to pull the whole motor now that I think about it especially if you've never rebuilt an engine. getting a used head it will need to be machined 80-120$ plus gasket 50-100$ plus your rods if it were me and I wanted to keep the 4.0 I'd replace the whole engine. There are alot of grand Cherokees with 4.0s in our local junkyard.
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Unread 01-23-2011, 09:50 PM   #10
gixxerphil
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Or that. But idk hes an auburn fan


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can you get a good pic of your muff set up ?
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Unread 01-23-2011, 09:51 PM   #11
BomberJeep
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if i decide to fix it myself what year heads can i use on my 00 block?
I would shop around for a new head. IIRC I saw some in q-tec for about 450ish with all the goods installed on them. All you would basically have to do is pop the old head and put the new one on. No muss not fuss.
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Unread 01-23-2011, 10:22 PM   #12
wushaw
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Don't mess with it, just rebuild it or get a rebuilt motor or a "KNOWN" good engine. 127k is nothing for mileage the PO must have overheated it and the damage was done.
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Unread 01-23-2011, 11:28 PM   #13
2ACR
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Get a new engine and then learn how to rebuild the spare. That's my plan. Jeeps just aren't fun if you aren't learning something.


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Unread 01-23-2011, 11:41 PM   #14
baldeagle1
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sounds familar. I bought a 2000 TJ 4.0. Drove for 6 mths then piston hat broke off. I would do what was metioned. Buy a used 4.0 and rebuild yours.
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Unread 01-24-2011, 12:23 AM   #15
witness
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2000 4.0L have the 0331 head casting which is very well known for cracking. Mine went the other day, just turned 80k miles. I think my PO thought it was a head gasket and put a bunch of sealer in the coolant and patched it up instead of fixing it correctly.

Cracked head isn't a huge deal, you can get a head from Alabama Cylinder head for less than $500 shipped to your door, torque it down and hit the road. If the rod bearing truly is bad, then you need a rebuild. I think a lot of people jump to the bad rod bearing a little too quickly. Do some research, make sure you got the correct diagnosis before making any decisions. Motor swaps are a pain in the ***, then again so is a rebuild.
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