In article ,
Peter Hendra wrote:

I have an engine alignment problem in that when my engine was taken
out of the boat in Port Sudan in the Red Sea, the mechanics who were
not marine engineers did not align it properly when they reinstalled
it. At lower revs it vibrates somewhat.

It has four flexi-mounts that are bolted to two longtitudinal engine
bearers and each is connected to the engine by a vertical threaded
bolt.

I would be very grateful if someone in the group could advise me the
sequence or process of aligning it again. The yacht is now out of the
water. The engine is a 37HP Nanni diesel with a "V" drive with a
plastic flexicoupling between the gearbox plate and the propellor
shaft plate.

You'll have to wait until the boat's back in the water, the rig is
properly tensioned and things have settled for awhile.

Then it's an iterative process of getting the height and angle closer
and closer, eventually winding up with the shaft in the center of the
shaft log and the drive plate exactly parallel on each axis. Then lock
the mounts down. recheck and bolt the shaft together.

Take the plastic piece out as you measure of course. It'll smooth things
if you're a bit off, but you don't want to have it always flexing.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/