On Tue, 06 Sep 2005 05:53:08 GMT, (John_F) wrote:

There is ONE nut plate hole in the crankshaft flange that has a larger
diameter nut than the other bolt nut plates. If you index the prop
incorrectly the prop tip will NOT track correctly in a single plane
since the prop will not sit flush against the crankshaft flange. If
the prop does not track in a single plane then it will shake and it
will require a lot of weight to correct. A dial caliper will show
which crankshaft flange nut is the larger one and it should match up
with the larger hole in the prop. If someone has installed the prop
so that the larger nut is in the wrong prop hole then torqued the
bolts down it may look ok as the nut swages out the prop or the
extender spacer but is will not correctly seat and will wobble.


Don't know about this partucular prop/engine combo, but I agree with
John. There is usually only one way a prop can be mounted and is
keyed as such. Not unusal to see one put on worng though.
Don