Merc Rebore & upsized pistions
As you may or may not know, I have decided to do a complete rebuild on the Merc. That way I know everything will be solid and I get an essentially new engine of known history!
I haven't got as far as extracting pistons yet, but as a pre - emptive Q are any of you Barrus / Merc type bods allowed to tell me how much of a skim of the cyl liner triggers the use of the +0.015" pistons & rings? I ask because from my current limited view through the exhaust port I may not need to remove too much metal (only feels like about 0.002" using my nail - not very high tech, I know....).
I am wondering if it needs "just" a couple of thou off to remove the scratches can I use the original pistons & new "standard" rings OR it it a case of "Skim 0.015 & get the upsized pistons or leave well alone"?
It would appear I have a "650" series, based on the part numbers of various lumps I have removed.
Thanks in anticipation.