It Sounds like a great idea, Jerry, but there aren't any old pistons lying around my shop. I do have pipe mandrels (basically a collection of steel pipes in many dimensions). I used the nearest to 3 7/8 to get a little extra press on forming the seal. The term "exact" doesn't apply to most of the work I do.
There seems to be a lot more rope than there is groove. That is of course the point of a seal. It would seem I will need to lift the crankshaft again tomorrow and see if I can press the rope farther into the groove.


It may not be the easy way, but it is the Cowboy Way - Ranger Doug
Beware of the stories you read or tell; subtly, at night, beneath the waters of consciousness, they are altering your world. - Ben Okri
1953 Chevy 3100
1960 Volvo PV 544
1941 Chevrolet Special Deluxe