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Unread 02-01-2006, 12:08 AM   #1
dirtbagofva
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Blown motor

if an engine over heats and locks up how difficult is it to repair? not sure if it a 4 cylinder or 6. Also not sure how it over heated. (My buddys 97 TJ) heard he blew it up from his mother.

Might offer him some help fixing it/swapping a new motor. Thanks for the help all.

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Unread 02-01-2006, 01:44 AM   #2
Matt Gertsch
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Is it an auto or a manual? Start by pulling the spark plugs and flooding the cylinders with penetrating oil.
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Unread 02-01-2006, 10:00 PM   #3
bobjp
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You may be able to get it unlocked by doing what mgertsch says. But if you do get it unlocked, you will probably experience oil burning and/or knocking and/or low compression and the engine won't last much longer. To repair it you would have to remove the engine and completely rebuild it purchasing all new gaskets, bearings, maybe cam/lifter, and piston rings. You will also have to have machine work done. It is hard to say without pulling it apart.
If it turns out that it is locked up, I would just buy a used low mileage engine from a junkyard and swap it in. It will be cheaper more than likely and definitely less time consuming.
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Unread 02-03-2006, 09:47 AM   #4
98JEEPTJ
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If it just over heated and quit then the motor isn't blown. If it over heated and went poof and oil and parts went everywhere then its blown...

I would drain the fluids and inspect them for contamination of oil or antifreeze in either or. You could just put a breaker bar on the crank and roll it over. Drop the pan and see if there is any visible damage if you don't feel anything rolling it over or see and damage I would fill it back up and crank it over and see if it starts...Hell you mights just have a bad oil pump. Youcan run it for a little bit before it heats up to casue damage and by then you can usually figure it out...
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Last edited by 98JEEPTJ; 02-03-2006 at 10:10 AM..
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Unread 02-03-2006, 11:29 AM   #5
Fullsize_CJ5
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If the engine got hot enuff to seize up there could any number of problems. Cracked or warped head, If it hydro-locked (from liquid in the cylinders) it could have broken rings, bent or broken connecting rods. I'd check that engine very close before i put any money in it. It could be fine and dandy, just fix why it overheated in the first place and drive on. But you never can tell without a good inspection.
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Unread 02-04-2006, 09:14 AM   #6
dirtbagofva
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thanks for all your input...will try and check the Jeep out this week.
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Unread 02-13-2006, 08:01 AM   #7
jwicker
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I have an 87 258 just pulled from my YJ is great working order for sale.
It was rebuilt aprox 5000 miles ago.
Holds great oil press. and runs fine.
PM for more info if interested.
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