GASOLINE STERNDRIVE INSTALLATION MANUAL
Page 12 of 137
90-860172011
Crankshaft Horizontal Centerline (X-Dimension)
X-Dimension can be measured by the 90 degree Tool Method or by the Tape Measure
Method.
90 DEGREE TOOL METHOD
1. Construct 90 degree tool.
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90
°
b
a
a -
13-9/16 in. (345 mm)
b -
Measurement: 4 ft. (1.2 m)
To Lower Drive Unit - Subtract from dimension “
a
.”
To Raise Drive Unit - Add to dimension “
a
.”
IMPORTANT: This dimension should only be raised or lowered after proper testing.
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Single Engine
Dual Engine
2. Place 90 degree tool along boat bottom at vertical centerline.
3. Locate the point at which top of tool contacts transom on vertical centerline. This is the
crankshaft horizontal centerline or X-Dimension.
4. Draw a line perpendicular to vertical centerline at crankshaft horizontal centerline.