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Old 08-30-2018, 11:52 AM   #1 (permalink)
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Is a 4.0 a 4.0?

I know diddly about jeeps other than the 4.0 is a very reliable engine.

My son has a 2001 Cherokee that he got smoking hot. Bad part is truck still has a note at the bank against it (struggling teenager) and its his only means of transportation.

I could yank the engine, and give it a back yard overhaul. This is the cheapest option other than finding a decent take out and throwing it in IF his head isnt cracked which seems to be an issue.

I was looking for a used motor and found one that is out of an 89 for $200 but it has a flat lobe on the cam. Supposedly a low mile total rebuild.

My question is will a 89 block and head have all the odds and ends it needs to slide into his 2001 and go to work after a cam/lifter swap and inspection of bottom end?

Does the head come off for lifters or can they be changed with the cam out and pan off?

Thanks all!!!!
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Old 08-30-2018, 12:02 PM   #2 (permalink)
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They're similar but not the same.

The intake ports on the head of an 89 (Renix) are lower than on a later (HO) head. You can bolt it together, but it's not ideal. The head also doesn't have the bosses to hold the coil packs, but you can work around that. The cam is also a different spec, again not sure if you care. If he has a manual tranny (rare in later years) the pocket in the crankshaft for a pilot bearing is a different size, and you will need a 70s CJ pilot bushing to make it work.

There's likely many other small differences.

If the engine comes with a flywheel/flexplate, do not use it, it won't run (crank position sensors works off the flywheel/flexplate).
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Old 08-30-2018, 12:06 PM   #3 (permalink)
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too big of a swing in years. I mean the physical size is the same but many of the bosses for mounting important stuff is in different places.

You could swap the head onto the older block. Problem is the new head is probably warped now.

Id look for 97 and up.
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Old 08-30-2018, 12:12 PM   #4 (permalink)
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Originally Posted by ky scrambled View Post
too big of a swing in years. I mean the physical size is the same but many of the bosses for mounting important stuff is in different places.

You could swap the head onto the older block. Problem is the new head is probably warped now.

Id look for 97 and up.
If it's an 0331 head and he got it hot, it's cracked, just that simple.

TUPY head, it's probably okay. They don't warp that easy anyways.

Watch out for buying ANY 99+ engines, lots of them with the 0331 head on them that is either cracked or will crack.
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