I agree. The ring gap is a critical measurement that is too often
overlooked when rebuilding an engine. The usual indication of a broken
piston due to improper (too small) ring gap is a lifting of the piston wall
in the area where the piston piece broke out. If the piston wall seems to
incline slightly upward, toward the top of the piston, there is a good
chance the reing gap was too small. In running conditions, particularly if
running a bit hot, the ring will expand to a point where it completely
closes the gap and, on occasion, will cause the piston wall above the top
ring to break away.
-----Original Message-----
From: owner-alpines@autox.team.net
[mailto:owner-alpines@autox.team.net]On Behalf Of jumpin'jan
Sent: Monday, June 25, 2001 11:20 AM
To: Scott Donnelly
Cc: Alpine list
Subject: Re: expensive engine noises - update
Scott,
I recommend rebuilding the whole engine. I have seen broken rings in
Alpine engines before and I suspect improper piston ring gap (not enough
ring gap). Someone probably forgot to set the gap, and installed the new
rings straight out of the box. Since you need new pistons, I would
measure the bore for wear and bore it the next oversize.
Jan
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