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Author Topic:   Outboard Mounting Concerns
Far North posted 03-12-2003 12:52 AM ET (US)   Profile for Far North   Send Email to Far North  
Greetings to everyone.

I am considering a new Whaler, probably a Montauk. When I was at the boat show, I wondered about the way these large, high-horsepower engines are mounted.

On the inside of the transom the engine mounting bolts have just a smallish washer. Is this large enought to spread the stress of these motors over the transom? I would think larger washers or two plates spanning the two sets of bolts would spread the force better.

Anyone had any problems with gelcoat cracking, due to the force on these inside transom washers?


captbone posted 03-12-2003 02:24 AM ET (US)     Profile for captbone  Send Email to captbone     
For normal use, I would never think twice about those washers. Next time you look at the transom, give it a hit with an open hand, it is made like a rock. On cheaper made boats, I would be conserned but that is why you are looking at a whaler. I had questions about whaler transoms in the past but now I am a believer.
witsendfl posted 03-12-2003 09:46 PM ET (US)     Profile for witsendfl  Send Email to witsendfl     
Normally the top 2 bolts are through bolted with large square 2 x 2 washers. with stainless nuts and bolts. Newer motors have the bottom 2 holes that bolt right into the engine mount. Some securing is done around the edge of the motor w/ a quality silicone or 5200. The Whaler transom in plenty strong... no worries


jimh posted 03-12-2003 10:30 PM ET (US)     Profile for jimh  Send Email to jimh     
I'd tend to think that the Whaler transom is probably stronger than cast aluminum of the engine bracket.

I would not use 3M-5200, a marine adhesive, as a bedding compound for the mounting boats.

Bigshot posted 03-13-2003 11:23 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You can buy an alum bar that connects the 2 upper bolts. I have one on my boat just because it looks good and I have a jack plate. There is little stress on the lower bolts .
TRAFFICLAWYER posted 03-13-2003 03:36 PM ET (US)     Profile for TRAFFICLAWYER    
Most vendors use transom plates, aluminum bars that bolt to bolt horizontally.
Clark Roberts posted 03-14-2003 07:38 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Far, I agree with the above posts but you could use two bolts on each side at top once final running height is determined and also connect with the cross-bar as mentioned above. Sort of like chicken soup, can't hurt and may make you feel better. Happy Whalin'... Clark... Spruce Creek Navy

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