Originally Posted by morganb
Yea that crossed my mind, there has been no vibration last summer, this summer i had noticed a small vibration jsut off the plain and it snapped on the 1st board, would alignment be likley to change between seasons?
FWIW, one thing you might also want to do is to measure alignment at the coupler before you pull the shaft. My marine mechanic simply loosened the bolts there and used a thickness gage to check. The gap should probably be within 3 thousands among the 4 readings (90-degrees apart). BUT, check your manual to ensure your spec.
Sorry missed table rocker's sound advice before I posted.