GASOLINE STERNDRIVE INSTALLATION MANUAL
Page 14 of 137 90-860172011
Transom Cutout
IMPORTANT: The following instructions will provide a sterndrive unit mounting
location that is suitable for most boats. Best mounting location for a particular boat,
however, can be determined only by testing.
1. Below 25 mph (40 km/h):
Subtract 1/2 in. (13 mm) from X-Dimension.
2. Heavy Duty Applications:
Subtract 1 in. (25 mm) from X-Dimension.
3. Above 25 mph (40 km/h):
Use X-Dimension shown.
4. Above 50 mph (80 km/h):
The X-Dimension can be increased to improve performance
in some applications. However, pulling power for skiing will decrease. During testing,
X-Dimension should be increased 1/2 in. (13 mm) at a time until desired performance
is achieved but in no case should it ever be increased by more than:
Maximum Increase In X-Dimension
Alpha 2-1/2 in. (64 mm)
Bravo One and Two 3 in. (76 mm)
Bravo Three 1 in. (25 mm)
Extreme care should be taken when raising drive unit to ensure that water supply does not
become aerated. Use clear water inlet hose to monitor incoming water and monitor engine
temperature gauge to ensure engine does not overheat.
In applications where cooling water to the engine is supplied by a through the hull
or through the transom fitting, the sterndrive height will not cause cooling water aeration.
IMPORTANT: Damage to Mercury MerCruiser products caused by too high of an
installed height will not be covered by Mercury MerCruiser warranty.
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