GASOLINE STERNDRIVE INSTALLATION MANUAL
Page 10 of 137 90-860172011
Boat Construction
Transom Thickness and Surface
IMPORTANT: Transom thickness and surface plane (flatness) must be controlled
where the sterndrive unit mounts.
Transom Specifications
Thickness Between 2 - 2-1/4 in. (51 - 57 mm) for 8 in. (203 mm) to either
side of the vertical centerline
Parallelism Inner and outer surfaces must be parallel within 1/8 in. (3 mm)
Flatness Transom surfaces in area where transom assembly will be
mounted (includes vertical as well as horizontal dimensions):
Inner Surface – Flat within1/8 in. (3 mm)
Outer Surface – Flat within1/16 in. (2 mm)
Angle 10 -16 Degrees
22170
c
a
b
e
d d
72700
a-Transom Thickness
b-Inner Surface
c-Outer Surface
d-Transom Plate Coverage
e-Transom Angle
70004
a
b
75479
c
a-Measuring Thickness
b-Measuring Flatness
c-Suitable Mandrel To Check For Uniform Transom Thickness
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