Max wrote:
Andy: can I ask why you would replace the rings at least?

Well why wouldn't you, while it's all apart?

Max wrote:
Regarding rings, I see a D shape in the top ring groove on the piston, which I assume is the mark for aligning the ring gap....should I see similar on the bottom expander ring groove?

No ring expander on the MC21. (It was only ever a thing on the MC16, and long discontinued.)

There's a peg in each groove for ring alignment. Note that the grooves are different shapes when you refit the rings. And yes, we have seen a flat ring jammed into the keystone groove before!


_________________
Andy.
NSR-WORLD.COM

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