Blown Head Gasket
#1
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Join Date: May 2009
Location: The Dirty 530
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Year: 1988
Model: Cherokee
Engine: 4.0 Renix I6
![Default](https://www.cherokeeforum.com/images/icons/icon1.gif)
Ok, working on a buddy's 91 XJ, blown head gasket, water journals are extremely plugged due to corrosion. Otherwise the barrels look good, but then I saw this:
http://imageshack.us/f/861/1000347q.jpg/
http://imageshack.us/f/716/1000346tt.jpg/
number 6 is oil fouled, and has what appears to be damage on the piston crown? The cylinder wall looks terrible, but its smooth when I fun my finger over it.
It was tic-tic -tic ing when he drove it up, but I thought that it could just be rocker noise.
So, ideas? He does not have the money for a rebuild, and my advice was to clean it up and run it ti'll he can get another XJ seeing as machining costs would be more than its worth.![Brick Wall](https://www.cherokeeforum.com/images/smilies/brickwall.gif)
But I would like a second opinion.
Thanks!
http://imageshack.us/f/861/1000347q.jpg/
http://imageshack.us/f/716/1000346tt.jpg/
number 6 is oil fouled, and has what appears to be damage on the piston crown? The cylinder wall looks terrible, but its smooth when I fun my finger over it.
It was tic-tic -tic ing when he drove it up, but I thought that it could just be rocker noise.
So, ideas? He does not have the money for a rebuild, and my advice was to clean it up and run it ti'll he can get another XJ seeing as machining costs would be more than its worth.
![Brick Wall](https://www.cherokeeforum.com/images/smilies/brickwall.gif)
But I would like a second opinion.
Thanks!
#5
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Year: 1988
Model: Cherokee
Engine: 4.0 Renix I6
![Default](https://www.cherokeeforum.com/images/icons/icon1.gif)
What size flex hone? and do I need to worry about the other cylinders, or just the troubled one? I was going to have him replace the timing chain/gears while we are at it. Oh and do we need to get the head milled?
Last edited by fallenknight308; 04-15-2012 at 05:12 PM.
#6
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
![Default](https://www.cherokeeforum.com/images/icons/icon1.gif)
you may want to do them all (but at least do the bad one) I've got 425,000 on mine and the #1 is loose due to have driven on a cracked head so the rings have room to grow, not sure on bottle size check with a machine shop, may want to go with over sized rings, mic the cylinders for size. as long as it never got WAY HOT the deck should be ok but at least surface the head.
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