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Unread 06-21-2010, 07:12 PM   #1
grimjeeperyj14
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1990 YJ Wrangler 
 
Join Date: Sep 2009
Location: Northampton, PA
Posts: 229
Top End Rebuild-run into piston ring problems!

Im am rebuilding a 1990 4.2 and need advice on what to do. I honed the carbon and such out of the cylinders and plan on putting standard size rings back in. My problem is all the cylinders measure the correct bore diameter(maybe .001 over) but the #1 cylinder measures .003 over. due to a broken ring ,can I still use the standard ring or will this screw it up? I really dont want to have it bored over at this time, can I make it work?

-I plan on using a rebuilt 4.0 head on the 4.2 block. I have read it increases compression if that matters.

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Unread 06-22-2010, 11:35 AM   #2
grimjeeperyj14
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1990 YJ Wrangler 
 
Join Date: Sep 2009
Location: Northampton, PA
Posts: 229
Any suggestions, Im sure someone has fixed something like this before?
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Unread 06-22-2010, 11:55 AM   #3
pasinbuy
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1994 YJ Wrangler 
 
Join Date: Feb 2007
Location: florida
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I do not think that .003 will make a differance. Take a piece of regular notebook paper and measure it. Notebook paper is .003 inches thick.

.030 is a differant matter.
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