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jason166
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 Posted: Wed Jun 28, 2006 8:00 pm |
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Joined: Sun Jul 31, 2005 10:32 pm
Posts: 96
Location: (s) Madison/La Crosse,WI and Rochester,MN
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This is a shortblock with 18,000 Miles on it, Take a look at these Pistons, Any guesses what would cause this? This shortblock been offered to me for 650 shipped.   Jason
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A923KGT
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Posted: Wed Jun 28, 2006 8:22 pm |
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Joined: Wed Aug 20, 2003 9:10 am
Posts: 1120
Location: Mount Horeb, WI
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most likely not a slipped timing belt. A valve would have to be bent to he77 to hit there. Could have a portion of a valve that broke off though.
Any damage to any of the other pistons?
What do the cylinder walls look like?
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G-ELL
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Posted: Wed Jun 28, 2006 8:36 pm |
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Joined: Wed Aug 13, 2003 1:18 am
Posts: 3153
Location: Lehigh Valley, PA
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Looks like damage from excessive amounts of knock or low oil pressure.
_________________ 06 Blue EVO 9
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jason166
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Posted: Wed Jun 28, 2006 8:36 pm |
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Joined: Sun Jul 31, 2005 10:32 pm
Posts: 96
Location: (s) Madison/La Crosse,WI and Rochester,MN
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I saw one other pistonthat had a very tiny nick on it compared to that big one, that's all I know, could particles left over from a spun bearing do this?
The owner told me that he had a spun bearing and then replaced his shortblock with this one and then took this one out when he put a built motor in, he was suprised to see this damage. He said he thought maybe the mitsu techs didn't replace the oil cooler. Sigh....
If so perhaps the bearings need to be replaced in this one, but atleast the crank would be in good shape ?
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G-ELL
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Posted: Wed Jun 28, 2006 8:39 pm |
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Joined: Wed Aug 13, 2003 1:18 am
Posts: 3153
Location: Lehigh Valley, PA
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The motor currently in your car is in better shape than that one.
Remember our talk the other night.
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440 4x4
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Posted: Wed Jun 28, 2006 9:34 pm |
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Joined: Mon Dec 01, 2003 9:56 am
Posts: 637
Location: Milwaukee
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I've seen a few motors with piston damage like that. They all had a chunk of "something" that had broken and bounced around in there, causing the damage. Ask him to take pictures of the matching heads, and look for similar marks....
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440 4x4
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Posted: Wed Jun 28, 2006 9:37 pm |
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Joined: Mon Dec 01, 2003 9:56 am
Posts: 637
Location: Milwaukee
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You've already had the heartache and expense of bearing failure - why mess around with something that has obvious damage?
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jason166
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Posted: Wed Jun 28, 2006 9:49 pm |
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Joined: Sun Jul 31, 2005 10:32 pm
Posts: 96
Location: (s) Madison/La Crosse,WI and Rochester,MN
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Thanks for the advice, I'm going to yield to the experts on this one 
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ttangel
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Posted: Thu Jun 29, 2006 7:21 am |
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Joined: Fri Jul 23, 2004 2:25 pm
Posts: 2502
Location: Green Bay
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hm. gonna agree with knock, -or- possible head damage (which the piston hit at TDC), just in that one spot. Usually when something gets loose in the combustion chamber, it will beat up the entire piston (and head). that looks to localized to be something loose in there, and bouncing around.
Was the block over bored way bigger than the pistons? could it be piston rattle? how does the cylinder look? Is it all mangled? I wouldn't even offer money until I or a machinist looked at the block completely.
_________________
Bad decisions make good stories.
Look at it! LOOK AT MY @SS AND TELL ME IT'S PRETTY!
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