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Old 10-22-2010, 12:44 PM
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Where's my piston?

So I was driving when all of a sudden I hear a pit of a pop or something(not really sure, music was up) and lost all power everything, and (obviously) would not turn over. Tore the engine out, ripped off the head and this is what I found. Anyone seen this happen before or heard of it happening in a jeep?

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Old 10-22-2010, 01:02 PM   #2
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Holy Sh&$!!! Dude it MIA! No clue. Saw this once on a dirtbike but no with whole thing gone

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Old 10-22-2010, 01:24 PM   #3
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yep, on my buddy's 69 camaro. it just shut off on him, no pop or anything. there were chunks of piston laying in the intake and antifreeze in the carb. only difference was 90% of the cylinder wall for that particular cylinder was also gone.
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Old 10-22-2010, 01:55 PM   #4
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It has to be somewhere, or at least the pieces of it. Seems odd that the cylinder wall is not destroyed.
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Old 10-22-2010, 02:00 PM   #5
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Had that happen with a cj a couple of times. Had the 304ci. Either way my headers kept leaking and it was sucking cold air into the cylinder and burning up pistons. Only once was the whole piston gone though.
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Old 10-22-2010, 02:11 PM   #6
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Alright David Copperfeild, where did you put it?
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Old 10-22-2010, 02:21 PM   #7
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A VERY GOOD excuse for a stroker!
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Old 10-22-2010, 02:21 PM   #8
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Holy crap!..... Never seen that before
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Old 10-22-2010, 05:56 PM   #9
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Old 10-22-2010, 07:54 PM   #10
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O___O

This is scary to think about. How was the engine sounding before this happened?
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Old 10-22-2010, 08:00 PM   #11
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I had the opposite happen. My Mack cylinder liner dropped down and got smashed to pieces by the spinning crank. Heck of a rattlin' noise.
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Old 10-22-2010, 08:00 PM   #12
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Something's amiss!!!!!!!!!!!
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Old 10-22-2010, 08:01 PM   #13
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Jesus, how many miles is on it.... Was on it :-/
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Old 10-24-2010, 09:14 PM   #14
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Pull your oil pan, thats where you'll find whats left of your piston!
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Old 10-24-2010, 10:21 PM   #15
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Dude, someone stole your piston.
Go to the police and report it stolen, we need to protect ourselves from this piston thief.
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Old 10-24-2010, 10:24 PM   #16
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Pull your oil pan, thats where you'll find whats left of your piston!

Yea all 35 thousand pieces of it.

I've been workin on cars since I was 10 but I ain't never seen that before, without a hole in the block somewhere
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Old 10-24-2010, 10:27 PM   #17
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Wow! Lets see more pics of the carnage as you continue the tear down, thats crazy.
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Old 10-24-2010, 10:30 PM   #18
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That's not cool. Maybe you could superglue the pieces back together and smear the face of the piston with JB weld so you can get some good compression.

Seriously though, now would be a good time to build a stroker.

Oh and replace the oil pump. Hard telling how much metal it ingested.
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Old 10-24-2010, 11:22 PM   #19
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That's one hell of a piston assisted suicide.
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Old 11-03-2010, 09:40 PM
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Definitely going to be making this into a stroker, other forums I've read say I can turn it into a 4.6L by boring it out and getting a different crank, once the project is underway I'll be sure to keep you Jeepers updated. Kind of excited. One question I have is how deep is too deep of a gouge in the cylinder wall before the block is garbage?
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Old 11-03-2010, 10:53 PM   #21
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I had one decide to leave the block while I was driving down the hiway... pieces everywhere in the engine and a 6" hole in the side of the block.
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Old 11-03-2010, 10:55 PM
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I had one decide to leave the block while I was driving down the hiway... pieces everywhere in the engine and a 6" hole in the side of the block.
What? What do you mean leave the block? Like with a gouge in it?

Lucky I didn't punch a hole in the block, don't know how I didn't.
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Old 11-03-2010, 11:04 PM   #23
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Definitely going to be making this into a stroker, other forums I've read say I can turn it into a 4.6L by boring it out and getting a different crank, once the project is underway I'll be sure to keep you Jeepers updated. Kind of excited. One question I have is how deep is too deep of a gouge in the cylinder wall before the block is garbage?
Find a good machine shop in your area and take the block to them. They should be able to tell you if the block is good or not! Jeep's block can only be overbored 0.060 over. So if if the gouge is deeper than 0.030, then it's time to look for another block. If it is less than that ask them to magnaflux the block to check for cracks.
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Old 11-03-2010, 11:51 PM   #24
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Find a good machine shop in your area and take the block to them. They should be able to tell you if the block is good or not! Jeep's block can only be overbored 0.060 over. So if if the gouge is deeper than 0.030, then it's time to look for another block. If it is less than that ask them to magnaflux the block to check for cracks.
He is correct. I bored mine out .060" and that is as far as it could go before being scrapped. I also found that with mine that I had to get a 3 core radiator to keep it cool.
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Old 11-13-2010, 12:19 AM   #25
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Your block survived that? It didn't take out the lower part of the cylinder?
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Old 11-13-2010, 02:32 AM   #26
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how the heck did this happen and how to avoid it if i can..
damn this is scary..
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Old 11-13-2010, 07:46 AM   #27
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My best guess is a detonation in the cylinder without the engine being on, having never seen that before I am probably wrong, but its just a guess

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