"Paul Sengupta" wrote in message . ..
"Orval Fairbairn" wrote in message
news ..
Tightening sequence: (1/2" first)

This is something I was thinking of. What happens if one comes loose?
Should you just tighten it to thee correct torque, or should the others be
loosened then all tightened in sequence? Maybe even replacing the
gasket? (don't know about gaskets...I would only guess as to the
presence of one)

Paul


Some of those nuts are on studs that pass through the case to hold
it together and to keep the main bearings tight in their bores. A
loosened stud could allow the bearing to rotate a bit if it didn't
have a locating pin in it. Can't remember if the O-200 has one. I know
that the Lycs do. I've seen a centre main rotate in an O-200 while the
cylinders were off and someone rotated the prop. Everything jammed
real tight when we retorqued it.
Rotated bearings cut off their oil supply ports and don't last
long.

Dan