Jerry_NJ
Petty Officer 1st Class
- Joined
- Aug 23, 2010
- Messages
- 250
I have both OMC and Yamaha 9.9 HP 2 cycl outboard engines mounted on aluminum fishing boats. Give I have been told never to use any steel hardware on an aluminum boat (not any pressure treated lumber either) I wonder what the clamp on such engines is made of. I know the clamps look to have steel threads, but maybe the clamp ends are aluminum, and if so the clamp thread must be stainless steel if it is to live with aluminum ends/clamp-faces.
Then there is the question of the large contact area of the clamp that pushes up against the rear of the transom, is the whole clamp stainless, or is it some hardened aluminum. I recall it is possible to make aluminum strong enough to be the block of an automobile engine - so I suppose there is a form of aluminum strong enough to carry the load of an outboard engine.
I think I have seen engines as large as 150 HP hung on a transom without the use of a transom jack to mount the engine on.
Then there is the question of the large contact area of the clamp that pushes up against the rear of the transom, is the whole clamp stainless, or is it some hardened aluminum. I recall it is possible to make aluminum strong enough to be the block of an automobile engine - so I suppose there is a form of aluminum strong enough to carry the load of an outboard engine.
I think I have seen engines as large as 150 HP hung on a transom without the use of a transom jack to mount the engine on.