This is a reproduction in HTML of Boston Whaler Dealer Bulletin 10-84. The bulleting gives advice on mounting engines in shallow splash wells on 16- and 17-foot hulls and on curved transoms on 13-foot hulls.
April 30, 1984
SUBJECT: RIGGING -- MERCURY 70- AND 90-HP ON 17-FOOT BOATS / OMC 40-HP ON 13-FOOT BOATS
Two questions have been asked repeatedly since these new engines have been introduced.
How do I rig the Mercury 70 and 90 horsepower engine on the shallow motor well of the 17-foot models? Mercury has changed the mounting bracket on these engines and there is no provision for the alternate upper bolt hole on the lower bolt hole group. We recommend these engines be raised up off the transom one hole. The upper hole in the lower group can then be used for lower thru bolts. It will be necessary to angle your drill bit slightly upward to ensure these holes enter the splash well. The lower interior transom washers must have a flat ground on the lower half or be bent to ensure the washer does not compress the fiberglass in the curve of spash well bottom. (See sketch below.)
How do I handle the wider OMC 40 horsepower motor bracket on the slight curve of the 13-foot transom? We recommend the use of one or two stainless steel washers as necessary between the bracket and the transom. This will allow you to draw up the mounting bolts without putting too much pressure on the motor bracket.
BOSTON WHALER INC.,
Manager, Customer Service
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This article first appeared April 11, 2009.