6C-6 - LOWER UNIT 90-817643R1 DECEMBER 1996
Transom height of the boat
Outboards with jet drives will be mounted approxi-
mately 7 inches higher on the transom than propeller
driven outboards. This requires outboards that have a
15 in. shaft length to be installed on boats having a 22
in. transom height and outboards that have a 20 in.
shaft length to be installed on boats having a 27 in.
transom height.
If the boat transom is of insufficient height, and the out-
board cannot be installed to the recommended height,
contact the boat manufacturer for recommended pro-
cedure to build up the boat transom.
Locate Center line Of The
Outboard
Locate (and mark with pencil) the vertical centerline (a)
of boat transom.
BA
DC
a
a - Centerline of Transom
Outboard Mounting Height
The initial outboard mounting height setting will work
good for most applications, however, because of differ-
ent boat/hulls designs, the setting should be re-
checked by test-running the boat. Refer to Water Test-
ing.
• Installing the outboard too high on the transom will
allow the water intake to suck in air and cause ca-
vitation. (cavitation will cause the engine to over-
speed in spurts and reduce thrust). This condition
should be avoided by proper height setting.
• Installing the outboard too low on the transom will
allow excessive drag.
SETTING OUTBOARD MOUNTING HEIGHT ON
BOATS WITH “V” BOTTOM HULLS
1. Measure the width of the leading edge on the water
intake housing. Make a horizontal line (a) on the
transom up from the “V” bottom the same length as
the width of the water intake housing (b).
b
a
2. Place (center) the outboard on the boat transom so
that the transom brackets are resting on top of the
transom. Temporally fasten the outboard to the
transom using two C-clamps.
3. Position the outboard in a vertical position.
4. Line-up a straight edge (c) along the bottom of the
boat with the horizontal line made in Step 1 and
measure the distance between the horizontal line
and top front edge of the water intake housing (d).
c
d
5. Raise The outboard up on the transom the dis-
tance measured in Step 4. Use a straight edge and
recheck the mounting height. The top edge of the
water intake housing should be lined-up with the
horizontal line made in Step 1.
6. Fasten outboard to the transom at this height.
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