Beam to hold motor mount for 470 mercruiser

Todd Peterson

Petty Officer 3rd Class
Joined
Jun 27, 2008
Messages
76
Motor mount that bolts to the beam between the stringers. The shop said it was bad.

The shop told me today that they have to pull the engine and cut out the beam between the stringers and replace it because is was rotten. I knocked hard on the bean and I did not see that the beam was in need to be replaced. They wanted $1,200.00 to fix it for me. 5 hours on the engine pull and 10 hours of fiberglass work. They also said that they could make a plate and set it on the beam and then bolt the plate to the stringers. They told me that the stringers are bad also. I looked at the boat and I could take my sawsall and cut the beam out and glass in a new beam with out pulling the engine. I have a 1984 Beretta and I am in the process of replacing the stator and water-cooled stator with an alternator. I will have to make my doghouse bigger to make some room for the alternator, so I will be getting out the fiberglass and resin for that reason.

I want to fix the beam myself.
Questions: Before I cut into my beam where the motor mount rests, how do I tell if the wood is rotten under the fiberglass? What type of wood should I use to rebuild the beam? Do I need to use Kevlar fabric and epoxy or can I use the standard fiberglass and rosin?

I knocked hard on the beam today and it seamed solid to me. I do not know what I am missing that it needs to be replaced. The shop seamed pissed because I wanted to take the boat and fix it my self.

Any hints for fiberglass use will be very helpfull

Thanks
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,082
Re: Beam to hold motor mount for 470 mercruiser

Ayuh,....

Your in the Wrong Forum for that kinda work,....

I suggest you wander over to the Boat Restoration Forum,+ Search "Rotten Stringers",......

You'll find All the answers you're lookin' for....
 

Todd Peterson

Petty Officer 3rd Class
Joined
Jun 27, 2008
Messages
76
Re: Beam to hold motor mount for 470 mercruiser

Ok, I will head over there and take a peek.
 
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