Unknowingly overheated..now ripping into the motor - Page 3 - JeepForum.com
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Unread 08-17-2013, 08:20 PM   #31
Jeeperez
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Quote:
Originally Posted by AZ Jeff
I will add one other comment--damage like I saw in your photos generally needs an oversized bore with a matching piston to properly correct the damage....
My question is.. Will one oversized piston and 5 standard pistons run smooth?

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[QUOTE=daverubino;10133980]Sell your YJ???? Why would anyone do that. You dont sell YJ's you just keep them until they become parts heeps for your next one.[/QUOTE]
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Unread 08-17-2013, 08:28 PM   #32
BassMasterCHS
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I gave wrong info, sorry. You can replace just one piston.
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Unread 08-17-2013, 08:59 PM   #33
Jeeperez
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Would it be easier to just throw in a new motor?

I'm guessing to keep the current motor I'd have to make all 6 oversized..?
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[QUOTE=daverubino;10133980]Sell your YJ???? Why would anyone do that. You dont sell YJ's you just keep them until they become parts heeps for your next one.[/QUOTE]
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Unread 08-17-2013, 09:06 PM   #34
BassMasterCHS
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Quote:
Originally Posted by Jeeperez View Post
Would it be easier to just throw in a new motor?

I'm guessing to keep the current motor I'd have to make all 6 oversized..?
With this kind of failure, yes it would be. Call around to a bunch of shops on Monday and get some prices.
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Unread 08-20-2013, 09:25 AM   #35
Jeeperez
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Found a motor from a local shop. Going to look at it tonight. 137,000 miles out of a 98. Guess it ran beautiful. Wants $200
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[QUOTE=daverubino;10133980]Sell your YJ???? Why would anyone do that. You dont sell YJ's you just keep them until they become parts heeps for your next one.[/QUOTE]
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Unread 08-20-2013, 10:00 AM   #36
cbenez1
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$200 for a good running 4.0 is a bargain. If you can hear it run. If not it's a crapshoot unless they offer a warranty. I sell them for $500 but I leave them in the vehicle so buyers can hear/see it run before purchase.
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Unread 08-20-2013, 10:03 AM   #37
cbenez1
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On that note I have a 103k 4.0 in a 96 for sale but your a bit far away. Good luck with your project.
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91 XJ 4.0 5spd 5.5 on 32's, flat flares, sand camo'd. "Battle Wagon"
01 XJ 'Up Country' 3.5 on 29's former fire vehicle. Bright red. "Fire Wagon"
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Unread 08-20-2013, 06:29 PM   #38
Jeeperez
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Quote:
Originally Posted by cbenez1
$200 for a good running 4.0 is a bargain. If you can hear it run. If not it's a crapshoot unless they offer a warranty. I sell them for $500 but I leave them in the vehicle so buyers can hear/see it run before purchase.
Well 200 is worth the motor. I'm sure it'll run good, he was willing to install it for an extra 200 guaranteed to work. But we will see this weekend, it looks to be in good shape



image-3113069825.jpg
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[QUOTE=daverubino;10133980]Sell your YJ???? Why would anyone do that. You dont sell YJ's you just keep them until they become parts heeps for your next one.[/QUOTE]
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Unread 08-23-2013, 11:22 AM   #39
cbenez1
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For an extra $200 I'd have let them install it and saved myself the hassle. Hope it works out for ya.
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A nation that "forgets" it's defenders, Will itself be "forgotten". Semper fi
91 XJ 4.0 5spd 5.5 on 32's, flat flares, sand camo'd. "Battle Wagon"
01 XJ 'Up Country' 3.5 on 29's former fire vehicle. Bright red. "Fire Wagon"
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Unread 08-24-2013, 09:38 AM   #40
poppyseed
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^agreed
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Unread 08-24-2013, 07:48 PM   #41
AZ Jeff
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Quote:
Originally Posted by Jeeperez View Post
My question is.. Will one oversized piston and 5 standard pistons run smooth?
I know you are replacing the engine, which is an easy way to solve your VERY big problem, but I must answer your question here, because someone else answered wrong.

Using one oversized piston with all others of "normal" size is not a problem. In fact, the factory used to do that quite often in the old days before the machining equipment could make very consistent bore diameters and piston sizes.

It was NOT uncommon at all to find engines straight from the factory with oversized bores on one or two cylinders. They would mark it with special punch marks on a certain spot on the block (described in the FSM) that would clue the technician working on the vehicle to the other-than-standard bore diameters. This was also done for main and rod bearing sizes as well.

It's rare for this to happen nowadays, since the machining equipment at the factories generates MUCH more consistent dimensional parts.
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Unread 08-24-2013, 09:06 PM   #42
cbenez1
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^See above post for correct facts.^
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A nation that "forgets" it's defenders, Will itself be "forgotten". Semper fi
91 XJ 4.0 5spd 5.5 on 32's, flat flares, sand camo'd. "Battle Wagon"
01 XJ 'Up Country' 3.5 on 29's former fire vehicle. Bright red. "Fire Wagon"
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Unread 08-25-2013, 08:17 AM   #43
Kalali
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$200 for the engine and $200 for the R&R, with guarantee, is unheard of. Its a no brainer...Let us know how you make out.
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Unread 08-25-2013, 03:52 PM   #44
Jeeperez
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Ok guys, did the swap this weekend. Had to swap over most of the front of the motor because the engine I bought was not an A/C model. Also the flywheel had to be swapped out because it was not matching at all

All in all it's a success! The new motor purrs like a kitten, has no leaks or ticks. Took me longer than it should have but I'm happy it's done.



image-3749992061.jpg



image-3037446312.jpg



image-290401449.jpg
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Matt

[QUOTE=daverubino;10133980]Sell your YJ???? Why would anyone do that. You dont sell YJ's you just keep them until they become parts heeps for your next one.[/QUOTE]
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Unread 08-25-2013, 03:55 PM   #45
Jeeperez
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Also figured out why my last engine overheated...




image-1640854065.jpg

Because my water pump was almost non existant!
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Matt

[QUOTE=daverubino;10133980]Sell your YJ???? Why would anyone do that. You dont sell YJ's you just keep them until they become parts heeps for your next one.[/QUOTE]
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