The top ring will normally have an outside chamfer going towards the top.
This is to clear any ring ridge that may still be in the bore.
The other two rings are normally not critical. Look carefully at the ring
flat, usually if there is a critical orientation it will be marked.
Kelvin.
> 3 rings (4-ring piston) that are in question. It would
> appear to me that
> the top ring (#1, compression) is one with a rectangular
> cross section, and
> slightly chamfered corners (the two that face outward). It would also
> appear that the #2 and #3 rings are the remaining two, both
> rectangular
> cross section with no chamfer, step, groove, etc. Just plain
> old cast iron
> rings they are. No reverse twist bevel on any of the three
> top rings also.
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