searay 420ac shaft whipping

[jwcsys]

The shaft is whipping, shafts are straight, engine and flange have been aligned and prop and cutlass bearing appear ok. What else needs to be checked that can cause the whipping on these long shafts.

 

[fwebster]

Strut alignment to the shaft log.

 

[dpmulvey]

Not familiar w the term. Please clarify.

WRT alignment, there is a fellow redoing a 39 who came up with an ingenious idea to align his.