Bravo Three Notice: Trim-In Limit Insert - Mercury BRAVO Service Manual

REMOVAL, INSTALLATION AND ADJUSTMENTS
Special Information

Bravo Three Notice: Trim-In Limit Insert

It has been brought to our attention that some boats (predominantly deep-V heavy boats)
will roll up on their side under certain, specific, operating conditions. The roll can be to either
port or starboard and may be experienced while moving straight ahead or while making a
turn. The roll occurs most frequently at or near maximum speed, with the sterndrive unit
trimmed at or near full IN. While the boat will not roll completely over, the roll may be
sufficient to unseat the operator or passengers and thereby create an unsafe situation.
The roll is caused by stern lift. Stern lift can be created by excessive sterndrive unit trim IN.
Under these extreme stern lift/bow down conditions instability can be created that may
cause the boat to roll. Weight distribution to the stern can reduce stern lift and, in some
circumstances, eliminate the condition. Weight distribution in the bow, port or starboard,
may worsen the condition.
The trim-in limit device reduces stern lift by preventing the sterndrive unit from reaching the
last few degrees of full trim under. While this device should reduce the rolling tendency, they
may not eliminate the tendency entirely. The need for the trim-in insert, and the
effectiveness of them, can only be determined through boat testing and is ultimately the
responsibility of the boat manufacturer.
It is recommended that only qualified personnel adjust the Trim-In Limit Insert. Boat
must be water tested after adjusting the device to ensure that the modified trim IN
range does not cause the boat to exhibit an undesirable boat handling characteris-
tic if the sterndrive unit is trimmed IN at higher speeds. Increased trim IN range may
cause handling problems on some boats which could result in personal injury.
IMPORTANT: On Bravo One, Two and Three Models, the Trim-In Limit Insert, must be
properly positioned before installing the trim cylinder anchor pin in the following
steps.
NOTE: When removing the sterndrive unit, make a note of the position of the insert for
reference when reinstalling the sterndrive unit.
Page 2A-4
WARNING
SERVICE MANUAL NUMBER 28
90-863160 MAY 2000