Motor blew
07-23-2020, 05:27 PM
#1
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Year: 1999
Model: Cherokee (XJ)
Engine: 4.0 I6
Motor blew
My motor decide to take a **** and I’m in the process of swapping it out with an identical motor “99 4.0 I6”. my question is am I fine with the Ecu I have or am I going to have to program it?
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Chased0203 (07-23-2020)
07-23-2020, 07:14 PM
#5
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Yeah, how do you blow a Jeep 4.0?
My last project knocked like a cement mixer, the rod bearings were 0.020 thinner in the middle.
I've seen them so worn out and abused that after pulling the head, you can more the piston around in the bore with your fingertip.
But, I've never seen one blown.
My last project knocked like a cement mixer, the rod bearings were 0.020 thinner in the middle.
I've seen them so worn out and abused that after pulling the head, you can more the piston around in the bore with your fingertip.
But, I've never seen one blown.
07-23-2020, 09:55 PM
#6
Old fart with a wrench
A sudden loss of oil pressure does wonders! Ask me how I know.....
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07-23-2020, 10:16 PM
#8
Old fart with a wrench
No, sheared oil pump drive tangs with no apparent reason. Brand new Melling pump from Pep Boys who kindly lost all the paperwork so Melling disavowed any claims. Needless to say, I was very upset and would like to forget the whole situation. Melling has the pump and couldn't find any thing wrong with it other than the sheared drive. On rebuild I replaced the cam sensor drive unit just in case it had anything to do with it.
The motor stayed together, but the crank was toast.
Last edited by dave1123; 07-23-2020 at 10:21 PM.
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