I'm not sure on the miles on the 90 motor as its already pulled from the jeep it was in and he don't have that jeeps particular body anymore. The block of my jeep has a hole about the size of a golf ball in the cylinder wall

 

Sorry to hear that. That happened to me Btw. #3 piston fell apart on a chevy 6, was in a (64), van where the engine is right between the seats, (has a middle seat on the engine housing). I could hear the knock pretty good since it was literally at arm's length. I put wood I found along side of the road on the front seats, a 4x4 across, the jack on that, and the tow strap over that and around the mounts, to lift the engine to get the pan off. Pulled the rod and wrist pin, (was still a little piston left), put the pan back, and drove home with the rockers there loosened.

If that guy with the 90 would let you pull the head and pan off that 90 to check it out that might be sweet. Doesn't take real long to check the ring ridges and plastagauge a few bearings. You are gonna swap heads anyway, and fresh rod inserts never hurt. I'm just rambling....

 

I'm planning on stroking it any way just as long as I can find a good block

 

When I read the title of this thread, I thought there was a rebuild in process and you were only able to come up with 5 new pistons.
Then I saw the pics and I literally said out loud
"How the <expletive> do you do that?!?"

Our 91 Laredo decided it didn't like its #5 so it decided to WEDGE it at a 45* angle in the bore.

ACTUAL AUTOPSY PHOTO


The shiny spot on the piston is from contact with the head.

It actually was running for 3 minutes after total internal failure. Just enough to get it into its parking space. Needless to say, the water-jacket was compromised and the entire contents of the cooling system is in the oil pan.

Picture was taken about 2 weeks after death hence the rusty-ness of the cylinder. We replaced the ENTIRE XJ, so there was ALOT of scavenging done.

From one survivor of a dead 4.0L to another, good luck on replacement.

 

Ouch What kind of oil where you use using? Also what kind of filter? Pennzoil & Fram ?

 

Wow yours is a little harder to explain lol. But I use castrol 5w30 and whatever filter jiffylube puts on

 

Visited the machine shop today and they said that they could sleeve my block even tho it has a huge gaping hole inthe cylinder wall if I'm planning to stroke it can I trust a sleeve?

 

Beyond my expertise, but I sure don't like it, stroked or not. I would think heat would need the opportunity to leave the sleeve equally, everywhere. Surprised they even want to bore past a hole.

All that money and trouble..I'd find another block myself.

 

Guys I'm in need is a new block help a fellow jeeper out if anyone has a 4.0 block laying around please sell it to me I am missing my jeep badly

 

Don't know your budget, but I'd look up ATK engines, Jasper engines, and Golen engines for a replacement. My JY here has a ton of older bodystyle XJ's but nonw of the newer, so I am in the same boat as you. Good luck.

 

If you do plan on stroking it any block will do and the renix blocks are considered by some to be stronger metallurgically speaking because of higher Zinc content and such. And I think the 3rd gen motors got some extra stuff the quiet it down a little and help with strength so the choice is up to you.

Bottom line it doesn't matter which block you use as long as you use all your external components you can use any block you want.

 

That's good to know bad thing is I can't find any block without having to drive to Ohio or farther

 

There has to be one around, can you try craig's list?

 

dang that sucks it messed up the block. We had one that threw a rod, we just removed the head, oil pan, dingleberried the bore, check the bearing tolerances/bore and threw another rod/piston and bearing in. Ran fine even with another bent rod (it was hydrolocked)

 

I live in a really small town and not much happening on cl around my area and not much for jeeps within prolly 200miles around my area