engine allignment

While winterizing my '75 Southwind 20 (351W/71C BW) last fall I noticed the jam nuts on the front motor mounts were loose. How do I determine if it is out of allignment (other than putting it in the lake and running it) and what is the procedure for re-allignment? Thanks.

the manuals in the refrence section give a short discription.

if the lock nuts are loose on the rear mounts, you should be okay and will only need to check as rick has stated ( but multiply by 10 0.001 to 0.003). it would be pretty hard for the adjustment shaft to spin from vibration.

if the front lock nuts are loose, you should be able to see if the trunion has been working up and down on the threads. the trunion is not threaded and the adjustment is from the lower nut.

it is important to align the boat at rest in the water. i do it with boat still attached to the trailer but floating. with calm water and a big pry bar, it's a two hour job.

if you think you want to try the ultimate-anal alignment, here is the
procedure