What is the Standard Transom Hole Layout?
It is believed that the hole arrangement currently in use by most engine manufacturers follows these dimensions: • The top pair of holes are spaced 12 and 7/8-inch on center; each hole is 6 and 7/16-inch from the engine bracket centerline. • The bottom pair of holes are spaced 9 and 7/8-inch on center; each hole is 4 and 15/16-inch from the engine bracket centerline. • The spacing between the top and bottom pair of holes is 8-inches on center. • The centerline of the top holes is 2-inches below the top of the engine bracket. The holes in the transom should be 1 and 7/8-inch below the top of the transom. In no case should they be closer than 1 and 3/4-inch to the top of the transom. Holes located 1-7/8-inch below the top of the transom will produce a slight gap between the transom and the engine mounting bracket. This gap can be filled with an appropriate spacer or shim to help bear the engine’s weight onto the transom. • When locating holes on the transom, do not assume the top of the
