BOAT CONSTRUCTION SECTION - 2
Page 2 / 4 90-899883183 DECEMBER 2007
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 51 ‑ 57 mm (2 ‑ 2‑1/4 in.) for 203 mm (8 in.) to either side of the vertical center line
Parallelism Inner and outer surfaces must be parallel within 3 mm (1/8 in.)
Flatness
Transom surfaces in area where transom assembly will be mounted (includes vertical as well
as horizontal dimensions) :Inner Surface ‑ Flat within 3 mm (1/8 in.) Outer Surface ‑ Flat within
2 mm (1/16 in.)
Angle 10 ‑16 degrees
d
d
b
e
c
a
7508
a - Transom thickness
b - Inner surface
c - Outer surface
d - Transom plate coverage ‑ 203 mm
(8 in.) from center
e - Transom angle
a
c
b
7682
a - Measuring thickness
b - Measuring flatness
c - Suitable mandrel to check for uniform
transom thickness
Transom Cutout
Refer to Section 6 - Drive System And Engine Mounting.
Checking Transom Thickness
Refer to Section 6 - Drive System And Engine Mounting.
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