Check these pics and tell me about my cylinder head and piston bores... - Page 2 -
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Unread 05-07-2013, 04:35 AM   #16
Web Wheeler
1993 ZJ 
Join Date: Apr 2007
Location: UK
Posts: 2,271
Originally Posted by gearheadnick View Post
The ridge ring is normal, just clean it off
Cool. Is that just with solvent, or should I use something like emery paper?

AVR2 is offline   Reply With Quote
Unread 05-08-2013, 03:26 PM   #17
Registered User
1995 ZJ 
Join Date: Jan 2011
Location: Flatsville, IA
Posts: 2,692
You should leave the ridge alone unless the piston is coming out.

It's partially carbon and the rest is a step between the original bore diameter and what it's now worn to. You'll never remove the whole ridge with cleaning.
Foundrydude is offline   Reply With Quote
Unread 05-08-2013, 05:26 PM   #18
Registered User
1998 ZJ 
Join Date: Aug 2010
Location: Virginia
Posts: 3,792
The ridge also forms i heard because the engine hasnt been run WOT a lot.. I heard running an engine really hard that has these ridges is bad thing to do.. I could be wrong but its what i read
2013 6.2 V8 Camaro SS 4k miles
1998 5.9 V8 ZJ 160k miles
1998 4.0 I6 Laredo ZJ 210k miles
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