Drilling motor mounting holes

[ElBichoMalo]

After rebuilding a transom, what is the best way to go about drilling new motor mounting holes? Seems pretty important to get it right. Do shops do this as part of rigging?

[FELLOW-SHIP]

Shops do it as part of the rigging But make sure they first epoxy the inside of the holes let dry and then use 5200 to help keep out the water. The bolts must be drilled on the same angle as the transom so they use a guide to maintain that angle. New motor shops have a stencil they use to mark the holes first.

FellowShip

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Just for the Grins

Official Antique Classic SeaCraft Owner

[SBD]

I bought this cheezy looking Wolfcraft drill guide for getting the holes perpendicular to the transom and it has worked like a champ. Definitely a handy little tool. I have also used it for thru hulls and other stuff.

[bigeasy1]

I also bought a drill guide,made by General.We used it to drill all the holes in my new transom to mount the outdrive transom assembly.
The mounting holes have to be at the angle of the transom,and it's important that they be right on.The guide was a big help to keep the drill at the proper angle.It's not NASA quality,but it's far superior than doing it by eye.

We also coated the inside of each hole with two coats of epoxy resin,to protect the core from any possible water saturation.


http://www.sears.com/shc/s/p_10153_1...2&blockType=G2

[mnwnvc]

I machined a piece of one inch aluminum bar stock with a step and the lower portion being a snug fit in one of the mounting holes of the engine. The center of the barstock was drilled out for an appropriate drill size. Tap the fixture into a mounting hole and drill. Worked great.