Working to re-assemble my 2F...but while spot-checking all the measurements for the rings and bearings, some things are amiss on both fronts.
Rings:
Block was bored .020/0.5mm overbore, and a bore gauge shows that it's there - ended up at 94.54, which is on the tight side of the 94.5-94.7mm spec for that bore. The .020/0.5mm pistons also check out. The pistons came with unknown-manufacture rings, but I ordered the Hasting .020 bore rings...however, both have an oddly wide ring gap.
Bearings:
Seeing some oddities with the crank as well - the rod bearings checked out ok, but the mains (Clevite MS-1429G) are running loose, especially the center two. The crank itself checks out with some quick measurements, generally on the large side, so seems like minimal wear there. (Machine shop also reached that conclusion back when it was there for machining and cleaning.)
* One - 2.637 in (Spec: 2.6367-76)
* Two - 2.696 in (Spec: 2.6957-67)
* Three - 2.755 in (Spec: 2.7548-57)
* Four - 2.814in (Spec: 2.8139-48)
Specs look for .020-044mm on the plastigage, but I'm in that .05-.07 range. Given the crank itself is on the larger side, it seems odd that the standard bearings are running loose. Checked them twice, generally same results.
Any ideas on either of the rings or the mains, as to why the parts that seem like they should be right, aren't? The rings are especially odd...bearings are a bit tighter tolerance. Going to try re-checking the crank one more time after dinner, going to the higher end of the cap torque range...I'd used 100 ft/lbs, and the range is 90-108.
Rings:
Block was bored .020/0.5mm overbore, and a bore gauge shows that it's there - ended up at 94.54, which is on the tight side of the 94.5-94.7mm spec for that bore. The .020/0.5mm pistons also check out. The pistons came with unknown-manufacture rings, but I ordered the Hasting .020 bore rings...however, both have an oddly wide ring gap.
- FSM Spec: 0.2 to .038mm
- Hastings: Top rings - 0.61mm, bottom rings - 0.56mm
- Unknowns : Top rings - 0.51mm, bottom rings - 0.41mm
Bearings:
Seeing some oddities with the crank as well - the rod bearings checked out ok, but the mains (Clevite MS-1429G) are running loose, especially the center two. The crank itself checks out with some quick measurements, generally on the large side, so seems like minimal wear there. (Machine shop also reached that conclusion back when it was there for machining and cleaning.)
* One - 2.637 in (Spec: 2.6367-76)
* Two - 2.696 in (Spec: 2.6957-67)
* Three - 2.755 in (Spec: 2.7548-57)
* Four - 2.814in (Spec: 2.8139-48)
Specs look for .020-044mm on the plastigage, but I'm in that .05-.07 range. Given the crank itself is on the larger side, it seems odd that the standard bearings are running loose. Checked them twice, generally same results.
Any ideas on either of the rings or the mains, as to why the parts that seem like they should be right, aren't? The rings are especially odd...bearings are a bit tighter tolerance. Going to try re-checking the crank one more time after dinner, going to the higher end of the cap torque range...I'd used 100 ft/lbs, and the range is 90-108.