oil canning at the motor mount

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Mike Whalen

My Evinrude 9.9 is mounted on the starboard on my '76 O'day 25. There is a piece of what looks like 1/2 inch plywood in the lazaret through which the mount is bolted. Recently noticed the oil canning. I lifted up on the mount, to relieve pressure, but no change. Is this something I should be concerned about? If so how do I fix it? Thanks in advance, Mike
 
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Josh

Go bigger...

IF there is nothing wrong with the fiberglass other then it's being pulled on, you need to back it with either thicker and longer/wider plywood, or remove that and replace it with two by fours. When I purchased my 22, the engine mount was only backed by fender washers! Needless to say, this wasn't acceptable. I removed the fiberglass wedge that was on the back and was stock as this was also causing problems. I modified the engine mount so that it would mount at the transom angle and still drop the engine in perpendicular to the waterline. I took a large peice of machined aluminum that was used by the previous owner as part of the engine mount and used this to back four of the six engine mount bolts. I then used a piece of two by four to back the other two. I can now hang off the back of the engine mount without worry, and I wiegh twice as much as the engine, so I think it's good. You are better off over building it like I did, then you won't have to worry about it happening again! Josh
 
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R.W.Landau

Just fixed the same problem.

I removed my motor mount to paint the boat. The previous owners did not seal the mount well. On the starboard transom the transom is about 1/4" fiberglass with 3/8 to 1/2" plywood core and a fiberglass layer on the inside of the boat that is maybe 1/8" think. My plywood core core was gone, rotted and gone. I injected about 1 gallon of polyester resin into the core space. the transom is now firm and I am installing an 8"x8"x 1/2" aluminum plate on the exterior between the mount and the transom to spread loads. I am installing a plate 12"x12"x 1/2" on the inside. hope this helps r.w.landau
 
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