Furuno TZTL12F Installation Manual page 20

1. MOUNTING
5. Using the three #10 x 1-1/4" self-tapping screws, temporarily screw the bracket to
the hull. DO NOT tighten the screws completely at this time. Follow the step 1-4
in "How to attach the sensor to the bracket", before proceeding with
"Adjustments".
Adjustments
1. Using a straight edge, sight the underside of the sensor relative to the underside
of the hull. The stern of the sensor should be 1-3 mm (1/16-1/8") below the bow
of the sensor or parallel to the bottom of the hull.
Note: Do not position the bow of the sensor lower than the stern because aeration
will occur.
2. To adjust the sensor's angle relative to the hull, use the tapered plastic shim
provided. If the bracket has been temporarily fastened to the transom, remove it.
Key the shim in place on the back of the bracket.
2°-10° transom angle (stepped transom and jet boats): Position the shim with
the tapered end down.
19°-22° transom angle (small aluminum and fiberglass boats): Position the
shim with the tapered end up.
3. If the bracket has been temporar-
ily fastened to the transom, re-
move it. Apply a marine sealant to
the threads of the three #10 x 1-1/
4" self-tapping screws to prevent
water seeping into the transom.
Screw the bracket to the hull. Do
not tighten the screws completely
at this time.
4. Repeat step 1 to ensure that the
angle of the sensor is correct.
Note: Do not position the sensor
farther into the water than
necessary to avoid increasing
drag, spray, and water noise and
reducing boat speed.
5. Using the vertical adjustment
space on the bracket slots, slide the
sensor up or down to provide a projec-
tion of 3 mm
(1/8"). Tighten the screws.
1-14
2º-10º 11º transom angle
NO SHIM
transom
angle
shim with
taper down
YES
YES
parallel parallel
12º-18º transom angle
NO SHIM
YES
NO
slight
angle
angle
reversed
Hull projection 3 mm (1/8")
19º-22º
transom
angle
shim with
taper up
YES
parallel
NO
angle too
steep
Cable cover
Cable
clamp
50 mm (2")