Finally have a little time to work on the 20/2 so i started the disassembly. Started by using a set of number stamps to mark the cyclinder head & block with the corresponding number stamped on the connecting rods, the cylinder closest to the cam gear is marked 00 & farthest is marked 11. I removed head 00 & the first thing I noticed was dimpling in the copper foil of the head gasket from dirt debris stuck to the bottom of the head.
The gaskets are stamped with the VICTOR name, at least the gaskets are made by a good manufacturer.
The top of the piston has a thin coating of greasy carbon built up on it, the exhaust valve has made an impression in the carbon on top of the piston even though it is vary thin, it appears the exhaust valve on this cylinder is adjusted too tight. After wiping the carbon away, I can see small dimples in the top of the piston where something has been caught between the valve & piston crown. I took a picture but you can't see the dimpling so I see no reason to post it here.
Measured the cylinder liner protrusion immedeately after removing the head, it measured .012 at four points, inline with & across the centerline of the crankshaft. I will check it again after removing the liner o-rings & reinserting the liner. The liner itself has almost no crosshatch pattern inside it, most likely the rings would never have seated.
The small cooling passages on the pushrod side of the cylinder block are nearly filled with casting slag
Found a nickle sized chunk of casting sand in the cooling inlet passage , better there than in the crankcase.
Cylinder 11 was nearly identical except there was no dimpling in the top of the piston, there was however a piece of string from a rag wrapped around one of the cylinder studs. it even had casting sand in the cooling inlet port. cylinder liner protrusion was .015 on this liner.
Both of the con rod bearings show wiping & the piston ring gaps are all lined up down one side of the piston. not good for compression.
It looks like the crankpins will polish up nicely.
the inside of the crankcase has a coating of fine grit covering everything, not to mention a piece of waxed string, a thread from a plastic "burlap" bag & a couple of small metal flakes. all in all the case looks pretty good , no voids or pockets of sand, & it came very clean with a washing of purple stuff de-greaser.
the Idler gear seems to be a mess, it wobbles back & forth on the idler bolt, not sure what the issue is with it yet as I havent taken it apart yet.
more tomorrow if I have time.
Scott R.
