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Old October 29th, 2010, 12:39 AM   #1
bumpy
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so i got this 92 xj with a blown head gasket for $500... yep after removing the head and all its blown, for sure... also cylinder 2 looks like the piston blew before the gasket... sounded like a rod knock when it started, above like 2k or so no issues but below you could hear it. photo below is cylinder 2 and cylinder 3. looks like it melted somehow...



ive never done shit with the lower end of a motor before so i need advice.. repair with a new piston, rings and shit or replace the whole flippin motor before i send the head off to get checked, cleaned, honed, planed whatever and buy piston, rings and tools to finish?

i talked to a couple friends and since i need to replace the oil pan gasket and rear main as well it seemed simple to replace the piston and rings since everything was open but they both said the rod may blow out the side of the motor within 500-1000 miles, is this true?

hoping to have it at the mounds on turkey day on 31s but the plans/ideas are below if that doesnt happen..

i need basic advice.. this jeep will serve any and all 4wd duties i need this winter... trips to boyne, crystal mountain, the U.P. for snowmobiling, towing toys as well... it shouldnt leave me stranded with enough $$ in toys behind it to get jumped.. ive found several motors in junkyards for 450 or less... no idea on condition, but carpart.com has helped... needless to say this jeep will be getting a 5.5 or 6.5 lift come spring, 35's, 97+ mirrors, and be as murdered out as can be considering it is white, its already got 20% tint all around but will be limo and the windshield will be done too.

thanks in advance anyone and everyone..
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Old October 29th, 2010, 04:47 AM   #2
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with that damage to the side of the piston, there is likely damage to the cylinder wall. You would need to have the block bored and replace all of the pistons to do it correctly. For a $500 beater, I would be looking for a good used engine, or try selling the thing to make back some of your money.
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Old October 29th, 2010, 05:18 AM   #3
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i would say junkyard motor as well. so u got to spend a little more, but u will.know that it has a.better chance of not dieing on u...bottom end of the 4.0 is easy to work on. everything was pretty straigh forward when i worked on my wifes.
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Old October 29th, 2010, 07:44 AM   #4
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replace the whole engine and use the one you take out to build a stroker that way you know everything has been gone thru and fresh
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Old November 3rd, 2010, 12:19 AM   #5
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im in the process of doing what you said tomtom... thought about it for a day and its the way to go.
picked up a decent $100 motor today, got home and started cleanin it up and taking shit off and noticed a exhaust manifold bolt in the head was broke off so the list of shit to swap over will be below.. if anyone has something to add it'd be appreciated. i hope to have the old motor out wednesday and the new one in by sunday.

parts to swap:
head including mopar performance gasket
intake and exhaust manifolds
starter, alternator, compressor, idlers... any accessory that bolts on (the ones on prior motor were all brand new)
cap/rotor/plugs... distributor too? how hard is it to re-do timing on these?
water pump
tstat housing, new tstat
valve cover gasket, oil pan gasket, tstat gasket, rear main

whats the easiest way to pull the motor out, trans and tcase attached or just the trans? should i pull the front end off including radiator to make it a little easier or is it just that much more work that doesnt need to be done? does the hood need to come off too?

thats everything i plan on doing tomorrow/thursday as well as painting the valve cover and oil pan. degreasing the motor with oven cleaner as well.
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Old November 3rd, 2010, 01:03 AM   #6
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Dude, you can find running XJs all day long for $500.
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Old November 3rd, 2010, 03:15 PM   #7
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ehhhh whats the fun in that? i already have the old motor out, so its half done... i like this one cause its really clean and straight, 3 dents on the whole jeep and like 2 spots of surface rust.. its from tennessee so i cant argue and with all the reciepts of over 2800 thats been replaced on it in the past year and a half, it should be a good beater when the motor is done.
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Old November 3rd, 2010, 11:33 PM   #8
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new to me motor is fuckin toasty tooo what the fukc ?!?!>! ill post pictars of it too.. thinkin bored 30-60 over just new pistons n rings, rod bearings too i guess and itll be good and waiting for the 4.2 crank and shit to be a stroker.. dont really have the cash to make one now, but should i? are they simple? if im already replacing the pistons and rings with a bigger bore should i find a 4.2 crank and rods? i could always get a loan from my boss or somethin to make this shit happen but in the long run would it be worth it? i hate my job and want to quit like yesterday... so i dunno, anyone with cost experience in this field would be awesome to chime in.. pictures of 'new to me' motor below





picture 3 shows what was covered under the grease(the huge fucking weld) as well as how 2 bolts with huge flat washers covered the water jacket holes in the block, fucking pissed at this motor and the guy who i got it from but it might not be his fault for sellin a shitty motor..
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Old November 4th, 2010, 02:54 AM   #9
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dude are you blind? if your gonna buy a running motor listen to it actually run before you throw money out the window
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Old November 4th, 2010, 09:13 AM   #10
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want to sell the roller? i'll give you the $500 for it.
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Old November 4th, 2010, 01:28 PM   #11
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blind no, impulse buyer yes. thought it would be good and be able to get bolted in this weekend... whatever shit happens. couldnt find any 4.0s on here craigslist and the ones on car-part were far away. found 3 this week though and wlll hopefully pick up the next one within the next week or 2.
and sorry i dont want to sell the roller.
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