41mm (1-5/8")
slope
of hull
Installation
Hole Drilling
1. Cut out the template (see Figure 3).
2. At the selected location on the starboard side of the hull, position the
template, so the arrow at the bottom is aligned with the bottom edge
of the transom (see Figure 4).
Being sure
the template is parallel to
the waterline, tape it in place.
Warning
: Always wear safety goggles and a dust mask.
3. Using a 4mm, #23, or 9/64" bit, drill three holes 22mm (7/8") deep at
the locations indicated. To prevent drilling too deeply, wrap masking
tape around the bit 22mm (7/8") from the point.
Fiberglass hull
—Minimize surface cracking by chamfering the
gelcoat. If a chamfer bit or countersink bit is not available, start
drilling with a 6mm or 1/4" bit to a depth of 1mm (1/16").
Plastic Shim
•
Standard transom
(13° transom angle)—The bracket is designed
for a standard 13° transom angle. The shim is
not
needed for this
installation. Skip to "Mounting the Bracket".
•
Stepped transom and jet boats
(3° transom angle) —Use the shim
with the tapered end
down
.
•
Small aluminum and fiberglass boats
(20° transom angle)—Use
the shim with the tapered end
up
.
•
If you are unsure about using the shim
, do one of the following:
• Measure the transom angle of your boat using a digital level or
bubble level and protractor. Then follow the instructions above for
your transom angle.
• Experiment with the shim. Follow the instructions: “Mounting the
Bracket”, “Attaching the Senor to the Bracket”, and “Checking the
Sensor Angle and Projection”.
Mounting the Bracket
1. Apply marine sealant to the threads of the three, #10 x 1-3/4", self-
tapping screws to prevent water seepage into the transom (see
Figure 5). Screw the bracket (and shim if needed) to the hull.
Do not
tighten the screws.
2. Using the vertical adjustment space on the bracket slots, slide the bracket
up or down until the distance between the bottom left corner and the
bottom of the transom equals 41mm (1-5/8"). Tighten the screws.
Figure 4. Template position
Align template arrow with
bottom edge of transom
Align template vertically
slope of hull
parallel to
waterline
✁
Align arrow with bottom of transom
Figure 3. Template
for starboard side of boat
Drill at locations labeled “B”
for transom angles 16˚ through 22˚
(most small aluminum boats)
Drill at locations labeled “A”
for transom angles 2˚ through 15˚
(most boats)
A
B
A
B
A
B
A
B
Figure 5. Distance between
corner of bracket and
bottom of transom
2
Figure 8. Bracket
retaining cover
Figure 6. Speed sensor
or
blank
Figure 7. Cover
closed
opened
mounting ears
screws
cover
speed
sensor
transducer
housing
some installations
bracket
screw
actual siz
e
actual siz
e
(self-tapping
#6 x 5/8")
self-tapping
screw
some installations
insert screw-
driver here to
remove cover
cover
tab in slot
flush with
housing
co
ve
r
housing