spark plug hole stripped! help!
Thread Starter
Member
Joined: Sep 2011
Posts: 125
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From: Indianapolis
Year: 1995
Model: Cherokee
Engine: 4.0 HO inline six
Ok so I try to loosen it and it gets tighter? Wtf the hole is cross threaded! What do I do. Do I have to get a new cyl head?
CF Veteran
Joined: Jun 2010
Posts: 1,220
Likes: 5
From: Arkansas
Year: 1987 & 1996
Model: Cherokee
Engine: 4.0
squirt some PB blaster around it and work it back and fourth and see if it frees it.
Worst comes to worst you will have to helicoil it, not sure it can be done with the head still on the engine.
Worst comes to worst you will have to helicoil it, not sure it can be done with the head still on the engine.
CF Veteran
Joined: Nov 2009
Posts: 1,438
Likes: 1
From: Dallas, GA 30157
Year: 1999
Model: Grand Cherokee
Engine: 4.0
Probably has carbon buil-up on it. Try removing it after the engine is hot.
Spray some penetrating oil on it and slowly work it back and forth. Hopefully,
it's not crossed.
Spray some penetrating oil on it and slowly work it back and forth. Hopefully,
it's not crossed.
This is a comin problem for Fords with the triten motors. Heliecoil is done to fix them and dealers do not take the head off. Guess all those fine shards just get blown out the tail pipe.
CF Veteran

Joined: Sep 2009
Posts: 3,612
Likes: 0
From: West Valley
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
The OP's situation sounds more to me like the plug is siezed rather than crossthreaded, as many have, stated, keep shooting the penetrent in there and work it back and forth (patience is your friend) once you get it out do yourself a favor and apply a tiny bit of copper antisieze to the threads of the new plug. You'll thank yourself for that later!
Last edited by Desert Rat; Nov 20, 2011 at 06:23 PM.
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