Zero Compression- Test Results

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12-25-2010 | 07:58 AM

#16

Beat-up Sport

Thread Starter

Newbie

Joined: Dec 2010

Posts: 19

Likes: 1

From: Indiana

Year: 1997

Model: Cherokee

Engine: 4L

so i get it all torn down and ready to pull the head.

and lo and behold piston #6

and then piston #3

so it's a total engine rebuild! Hey guys! DON'T RUN YOUR 4.0'S WHEN THEY'RE OVERHEATING!!!!
I am so lucky I have something else to drive while I put this thing back together!

Last edited by Beat-up Sport; 12-25-2010 at 08:32 AM.

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12-25-2010 | 03:08 PM

#17

gmullin

Member

Joined: Sep 2010

Posts: 123

Likes: 0

Model: Cherokee

opsi broke the pistions looks like my buddies saturn haha

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12-25-2010 | 04:21 PM

#18

Turbo X_J

CF Veteran

Joined: Sep 2009

Posts: 8,567

Likes: 19

From: ☼ Blackhole Sun

Year: My Jeep is a GMC

How many miles and whats the condition of the rest of the rig? Probably less expensive to slap a bone yard motor in it, versus brand new everything.

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12-25-2010 | 05:28 PM

#19

Diesel

CF Veteran

Joined: Aug 2010

Posts: 2,112

Likes: 4

From: Wantage, NJ

Year: 1995

Model: Cherokee

Engine: 4.0 I6

Quote:

Originally Posted by tjwalker

Head is going to have to come off.

When removed, take it to a reputable machine shop that specializes in this type of work.

They can do a thorough check of the head for straightness, cracks (magnaflux testing) etc. and the internals on that head.

Then install a new headgasket with a verified head.

You do NOT want to just replace the headgasket without having a shop checking that head over!

Magnaflux and Zyglo are never the way to go, pressure testing is the only way to be 100% sure its in working condition.

And sorry to hear about the engine

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12-26-2010 | 08:22 AM

#20

Beat-up Sport

Thread Starter

Newbie

Joined: Dec 2010

Posts: 19

Likes: 1

From: Indiana

Year: 1997

Model: Cherokee

Engine: 4L

Quote:

Originally Posted by Turbo X_J

How many miles and whats the condition of the rest of the rig? Probably less expensive to slap a bone yard motor in it, versus brand new everything.

You may be right, and i AM looking into that. I'm mulling the idea of buying my wife a newer daily driver, hijacking HER 99 Cherokee, and turning this one into my SHTF, off-road truck.
The rest of the truck is pushing 200,000k miles. This is the second motor it's seen, but I'm finding out that the mechanic who installed it is a complete con-artist. (that's a story for a different thread)
I've got a buddy who owns a machine shop, so my rebuild cost will be substantially lower than most, and the knowledge I'll gain will a bigger bonus. He's coming over this morning, and we're going to discuss options...

Thanks guys, I'll keep you posted!

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