plug old motor holes?

Jhoppy

Petty Officer 3rd Class
Joined
Oct 30, 2009
Messages
77
Like the title says what is the best way to plug the old motor holes in the transom when intaling a different outboard motor?
thanks

Jason
 

Woodonglass

Supreme Mariner
Joined
Dec 29, 2009
Messages
25,929
Re: plug old motor holes?

How big are the Holes? Outboards typically don't require holes in the transom. If the holes are Not larger than 1/2 inch I would use 3M 5200.

I'm just sayin...:D
 

Jhoppy

Petty Officer 3rd Class
Joined
Oct 30, 2009
Messages
77
Re: plug old motor holes?

I don?t think the bolt holes are larger than 1/2 but this will be the third motor on this boat. The original motor was replaced before it was in my possession and the original bolt holes look to have clear silicone or sealant in them. The 90hp force that was installed previously has now come apart so now I plan on installing an older mercury tower of power. With all these motor changes however the transom is going to look a little like swiss cheese. The original motor had four bolt holes, the 90 hp force has four bolt holes, and the tower of power will require six bolt holes with the power tilt trim. So should I be filling the unused eight bolt holes in with fiberglass or something of that nature?
 

Woodonglass

Supreme Mariner
Joined
Dec 29, 2009
Messages
25,929
Re: plug old motor holes?

LIke I said before Use 3M 5200. It is a Permanent Sealant. You could mix up some epoxy with some glass fibers and cabosil in it as well. But first you will need to drill out ALL of the OLD silicone and clean out the holes with Acetone. Make SURE that ALL remnants of the Silicone are gone or the 3M or the Epoxy will not adhere properly.

I'm just sayin...:D
 

drewpster

Commander
Joined
Oct 17, 2006
Messages
2,059
Re: plug old motor holes?

Get some hardwood dowel rod. Drill the holes out so that the dowels fit snug on the holes. Coat the holes and the dowels with epoxy resin. Tap the dowels in to the holes. Cut the dowels off flush after the epoxy cures. Sand the ends of the dowels below flush. Use polyester resin and cloth circles to bring the surface back flush. Color match some gelcoat repair kits, apply the gelcoat. Compound and polish.

Complicated, but fool-proof. If you want the water to stay out of your transom.

enjoy
drewp
 
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