ok, well an update. Found this on 3 which is also a solid skirt piston and had one bad top ring and a broken second. Also very stiff gudgeon on 4. So that is positive to find but does beg the question of whether a fault on just one can result in oil in 1 and 4 as well as the global blowby issue. I'm doing ring and bore clearance checks on the rest.
Question - do new pistons come at exactly the stated dimension, or are they minus the few thou in expectation that the bore has been done to stated dimensions? If anyone has a split skirt +040 in decent nick, do shout!
The excavations also unearthed a single, shot pair of shell bearings on journal 2. All the shells are not drilled for the upper rod. But that is another story for another thread!
Question - do new pistons come at exactly the stated dimension, or are they minus the few thou in expectation that the bore has been done to stated dimensions? If anyone has a split skirt +040 in decent nick, do shout!
The excavations also unearthed a single, shot pair of shell bearings on journal 2. All the shells are not drilled for the upper rod. But that is another story for another thread!