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Jeep Need suggestions for replacement 4.0 for a TJ

Greg

Greg

I run a tight ship... wreck
Admin
Location
Grand Junction, CO
Think the head can reused?

I've found a few options, long and short blocks.

https://www.mabbcomotors.com/catalo..._CORE_REQUIRED_-_90_Day_Limited_Warranty_/645

https://www.4wd.com/p/atk-replacement-engines/5564

https://www.ebay.com/itm/Remanufact...d=260704473356&_trksid=p2047675.c100005.m1851


This one looks pretty good, but they require a rebuildable core or $350 core charge. Looks like a quality build with a bump in compression. -

http://www.titanengines.com/remanufactured-high-performance-jeep-4-0-242-engine/
 
Hickey

Hickey

Burn-barrel enthusiast
Supporting Member
Location
Grantsville, Utah
Greg said:
Think the head can reused?

I've found a few options, long and short blocks.

https://www.mabbcomotors.com/catalog/Auto/National_Short_Block_Program_-_NO_CORE_REQUIRED/Jeep/Jeep_4.0_242_Short_Block_1999-
gijohn40 said:
if you need a core I have a couple.
Click to expand...

2006_#327AB-328AB_-_NO_CORE_REQUIRED_-_90_Day_Limited_Warranty_/645

https://www.4wd.com/p/atk-replacement-engines/5564

https://www.ebay.com/itm/Remanufactured-4-0-242-Jeep-Short-Block-1999-2001-449AA/251171919692?_trkparms=aid=222007&algo=SIM.MBE&ao=1&asc=41376&meid=95af36f078ca477ea895d7b437a3bfd9&pid=100005&rk=3&rkt=6&sd=260704473356&_trksid=p2047675.c100005.m1851


This one looks pretty good, but they require a rebuildable core or $350 core charge. Looks like a quality build with a bump in compression. -

http://www.titanengines.com/remanufactured-high-performance-jeep-4-0-242-engine/
Click to expand...
That Titan engine looks like a pretty good deal, and I think the core charge is gonna be there for any engine we look at.
I think the head is still fine. Pretty sure it was just a rod that snapped. The oil is still very clean, and she still runs... Mostly. I'm surprised how very little oil came out of the hole. Maybe a tablespoon.

gijohn40 said:
if you need a core I have a couple.
Click to expand...
Thanks John. That may come in handy.
 
Last edited:
UNSTUCK

UNSTUCK

But stuck more often.
Any idea as to what cause the break? This is one we don’t see very often. Over reved?
 
Hickey

Hickey

Burn-barrel enthusiast
Supporting Member
Location
Grantsville, Utah
UNSTUCK said:
Any idea as to what cause the break? This is one we don’t see very often. Over reved?
Click to expand...
All I can do is make assumptions at this point.

This Jeep had a rollover many years ago. It hasn't been daily driven since that time, which is why it only has 33k miles on it. I'm guessing a little oil leaked into the cylinder at the time of the rollover and slightly bent/damaged a connecting rod, and it's just taken a while to rear it's ugly head.

Shit happens, and no one expected this to happen. I don't blame Carl or any one else for this. He couldn't have known this was gonna happen. Anthony doesn't drive it hard or over rev the motor, and it wasn't a cold motor when it happened. He had been on the road for over an hour when it let go. He still loves the Jeep and can't wait to learn how to swap a motor this weekend.
 
Hickey

Hickey

Burn-barrel enthusiast
Supporting Member
Location
Grantsville, Utah
gijohn40 said:
He over tightened that oil pan bolt... thats where the crack started! lol
Click to expand...
LOL, the whole bottom left corner of the block is only held in place by the Trans and the oil pan.

I'm thinking of making a video tomorrow with my gopro and some good lighting. Fire that sucker up and pin the throttle while the gopro is pointed at the hole in the block.
 
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