Mercury MerCruiser 3.0 MPI Installation Manual page 14

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BOAT CONSTRUCTION
Boat Construction
Transom Thickness and Surface
IMPORTANT: Transom thickness and surface plane (flatness) must be controlled where the
sterndrive unit mounts.
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
Angle
a
c
b
Transom Cutout
Refer to Section 6 - Drive System And Engine Mounting.
Checking Transom Thickness
Refer to Section 6 - Drive System And Engine Mounting.
Page 2 / 4
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.)
10 ‑16 degrees
e
b
a -
Transom thickness
b -
Inner surface
c -
Outer surface
a
a -
Measuring thickness
b -
Measuring flatness
Transom Specifications
d
d -
Transom plate coverage ‑ 203 mm
(8 in.) from center
e -
Transom angle
c
c -
Suitable mandrel to check for uniform
transom thickness
SECTION - 2
d
7508
7682
90-899883183 DECEMBER 2007

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