2001 xj piston damage at 60k? - JeepForum.com
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post #1 of 4 Old 11-13-2019, 03:20 AM Thread Starter
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2001 xj piston damage at 60k?

Im just doing a head replacement on my 01 xj (0331 cracked) and while cleaning the old head gasket off the block I noticed a small chip in the top side of piston 3 and some scoring down both sides of the bore on cylinder 3 and 4.
It looks like it could be piston slap? But there's barely any wear (can't feel a step with my finger nail) on any of the bores. (As you would expect on a low milage motor).
Are these pistons prone to failing?
I feel like I need to now remove all the pistons and do a closer inspection.
Am I being ott?
What would cause piston slap so prematurely?
I've never done any bore honing before so not quite sure what I need to do?
Will I need replacement oversized pistons?

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post #2 of 4 Old 11-13-2019, 05:20 AM Thread Starter
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Here are some pictures.
It looks like it's been starved of oil and I have half a mind of just leaving it and fitting the head.
But has too much damage already been done?
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IMG_20191113_120629_1573647218323.jpg   IMG_20191113_120750_1573647297398.jpg   IMG_20191113_120635_1573647389904.jpg   IMG_20191113_120933_1573647510921.jpg  
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post #3 of 4 Old 11-14-2019, 04:43 AM Thread Starter
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Wow, nobody has any advice to give.
Glad I signed up to this forum...
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post #4 of 4 Old 11-19-2019, 05:12 PM
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There are good days & there are not so good days when it comes to the subject of responses to queries. I am not a machinist but I have rebuilt a few engines in my days. The scuffing at the top of the cylinders is unusual. I would expect to see a carbon ring around the top of the cylinder but not this type of wear. Piston failure is uncommon but it does happen. If it was mine, I would at least pull the suspect pistons & see what is found. Pictures I have viewed of pistons that have failed in the 4.0 have lost pieces down low on the piston skirt which creates the piston slap noise but the engines continue to run. Have you the pan off of the engine? Any sign of metal debris in the pan, perhaps a chunk of aluminum perhaps?
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