outboard engine mounts

A

abbotm5

Seaman Apprentice
Joined
Jan 18, 2008
Messages
49
Im replacing my 90 force outboard with a 120 force outboard. I wanted to know if there were any gaskets or something to go around the screw between the motor mount and the boat. It looks like there was a caulk there before, but nothing to keep the metal from touching the boat. Also, Is the caulk stuff to keep it waterproof?
 
Scaaty

Scaaty

Vice Admiral
Joined
May 31, 2004
Messages
5,180
Re: outboard engine mounts

If you are talking where bolts go through the hull to bolt it on, yes, its just for a water seal to prevent water getting into the transom and roting it out. Get some 3M4200 (tube) and slather the holes and bolts. Thats all..
 
Frank Acampora

Frank Acampora

Supreme Mariner
Joined
Jan 19, 2007
Messages
12,004
Re: outboard engine mounts

If you take a countersink and chamfer the holes about 1/16 or so, whatever you use to seal the bolts ( I prefer black RTV silicone) will fill the chamfer and act like a gasket.

While you have the engine off the boat: Force engines do not have a lot of bearing area on the transom. I like to put a hard or aircraft grade aluminum plate about .080 thick and 12 X 16 inches in size on the transom where the clamps will attach. Diamond plate is not acceptable; it is relatively soft. You can also use 1/16 stainless but it is real expensive and a bear to drill.
 
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