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Unread 10-08-2013, 09:05 AM   #1
stukimurray
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1997 ZJ 
 
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Piston skirt failure 97 ZJ 4.0l

Well I have been under my jeep today pulling the sump . My jeep started knocking badly a few days ago and I read up on here the conclision was a skirt failure on one of the pistons. After a struggle to get the sump or oil pan off as you call it. My fears were realised. In the bottom of the sump was lots of metal. #2 piston had exploded. I am not smart enough or have enough time to strip the engine and rebuild it and I am not rich enough to buy a recon one which leaves me two options. Scrap it or buy a second hand engine. My thought is If I buy an old one what's to say that piston won't explode as well leaving me worse off. What I am asking is how common is this problem and what mileage do they normally go at???

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Unread 10-08-2013, 03:12 PM   #2
Kevinyj95
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not common in the I6 is in the l4. I6s can be found cheap paid 300$ for the last one i bought. bought a gasket kit for 100$. Never actually seen one on a I6. Ive blown piston rods thru the side of the block and pan always in water or in real deep nasty ****. but ive seen them at 300k and still going.
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Unread 10-08-2013, 03:14 PM   #3
Kevinyj95
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most of the time the piston will destroy the sidewall so rebuild most likey is not an option.
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Unread 10-08-2013, 04:33 PM   #4
CatSplat
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The piston skirt failure is definitely known to happen with high-mileage 4.0Ls, but it's not what I would call a common occurrence. In your situation I would probably go with a used motor - your block is probably pretty thrashed anyway.
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Unread 10-13-2013, 09:48 AM   #5
holliewood61
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Pulling the head to see what's going on isn't a terribly difficult task you may be able to get away with putting a piston in it. I recently had a skirt let go in my tj and it didn't tear up the cylinder. New piston, rings, and head gasket and she was back on the road

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Unread 10-13-2013, 10:39 AM   #6
xcaliber81
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Anything in particular that can cause this other than a high mileage engine as I have a high mileage zj that i dont currently beat the snot out of.
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Unread 10-13-2013, 10:49 AM   #7
Martin600
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Quote:
Originally Posted by xcaliber81 View Post
Anything in particular that can cause this other than a high mileage engine as I have a high mileage zj that i dont currently beat the snot out of.
Neglecting oil changes perhaps? lubrication failure, hot spots then BOOM!

I thought these engines were pretty much bomb proof if you look after them.
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Unread 10-13-2013, 10:54 AM   #8
holliewood61
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Not real sure what causes it mine was relatively low mileage for a 14 yr old rig at 105k when it busted and I'm not hard on it.
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