Posted by Paul in MN on February 17, 2010 at 17:19:46 from (71.210.152.75):
In Reply to: Cylinder Ridge posted by Paul from MN on February 17, 2010 at 14:47:47:
I would ream the ridge out so the top ring can not hit it. Sure, you haven't changed anything in the bottom end, but as others have said, the ridge is a sign of a very probable worn bottom end. I had a 55 Plymouth flathead 6 as my first car and unknown to me it had ring ridges. With another year's of driving, there was now enough bearing slop to let the piston come up higher than any time before. Yes, the RPMs were up, but not beyond normal driving. 2 pistons smacked their top rings on the ridges and broke the top land of the piston. The rings went over the top and smacked between piston and head. The engine sounded like it was beating itself to death. When I pulled the head, there were shards of rings embedded in the top of the 2 pistons. Most of the pieces had gone out through the exhaust.
So I always ream the ridges even if I am going to bore the block. It makes getting the pistons much easier to get out of the block. A ridge reamer is not an expensive tool. Its cutting power is supplied by your hand turning a wrench.
The other guys are right about the engine needing a full rebuild, but I understand with the current economics, many guys have to do what then can to get by.
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