Recently my jeep cooling system went dry. It was not out of neglect. The large hose fell off the radiator and spilled the fluid. Anyway the 2001 grand cherokee overheated and died. After filling it back up with fluid I tried starting it. It idled at low rpm and very rough. Would also not go faster than 30mph. I took it into the mechanic. He said it has a cracked cylinder head and needs an engine replacement. Is it worth swapping the engine? Is it repairable or even recommended? What do you recommend I do at this point especially because I just dropped $800 on tires..? I really would like to get it running again as I love my jeep...
Jeep Grand Cherokee 2001
4.0 6 cylinder
Thank you for any input!!!
Gah - sounds like a Bentley owner. "I had to use my ashtray, where can I buy a new car?"
I seriously doubt you have a major problem with the block. I'm even dubious about the "cracked cylinder head" - where did he say it was cracked, and how did he test for it?
I've blown hoses on two different XJs with the 6-242 - the only thing I really had to do was change the thermostat (they fail if overheated, and "freeze shut,") replace the hose, and refill. It passed compression, so I didn't see a need to even do a leakdown.
Iron engines are incredibly tough. If it was an aluminum head on an iron block, I'd be worried about a warped head (which is more likely than a cracked heat,) but iron heads only warp rarely. Cracking one is horribly difficult.
@cirruslydakota - what you're referring to is the known issue with the #0331 heads through mid-2001, which isn't necessarily related to overheating. OP, the crack he's referring to happens on the top
surface of the head - and is immediately identifiable by looking down through the oil fill cap and seeing a "chocolate milkshake" from coolant & oil being mixed, and whipped by rocker arm action.
However, given my own history with engines in general (and AMC designs in particular,) I'd ask for proof of a cracked head.
If the head is
cracked, you probably don't need a new engine. Tear off the head and inspect (heat-related flaws in the cylinders tend to be visually obvious.) However, I think you'll find the "short block" (lower assembly) will be fine.
Ask him why he thinks the head is cracked, and where he thinks it's cracked - if he can't answer both
of those to your satisfaction, you should find another mechanic.