Furuno TZT12F Installation Manual page 20

1. MOUNTING
1.2.3 How to install the transom mount transducer
The optional transom mount transducer is very commonly employed, usually on
relatively small I/O or outboard boats. Do not use this method on an inboard motor
boat because turbulence is created by the propeller ahead of the transducer.
DO NOT over-tighten screws, to prevent damage to the transducer.
Installation procedure
A suitable mounting location is at least 50 cm away from the engine and where the
water flow is smooth.
1. Drill four pilot holes for self-tapping screw (5 20) in the mounting location.
2. Coat the threads of the self-tapping screws (5 14) for the transducer with marine
sealant for waterproofing. Attach the transducer to the mounting location with the
self-tapping screws.
3. Adjust the transducer position so the
transducer faces right to the bottom.
If necessary, to improve water flow
and minimize air bubbles staying on
the transducer face, incline the trans-
ducer about 5° at the rear. This may
require a certain amount of experi-
mentation for fine tuning at high cruis-
ing speeds.
4. Tape the location shown in the figure below.
5. Fill the gap between the wedge front of
the transducer and transom with epoxy
material to eliminate any air spaces.
6. After the epoxy hardens, remove the
tape.
Transducer protrusion
If the hull is not level within 15° in any direc-
tion, install the transducer so that it protrudes from the hull, to keep the transducer face
parallel with the water line, not with the hull.
This installation method has a merit for avoiding the bubbles by diverting turbulent wa-
ter around the sides of the transducer rather than over its face. However, it may cause
damage to the transducer during trailering, launching, hauling, and storage.
1-12
Transom
Less than 10° Less than 10°
Mount at the strake.
Transom
Strake
Over 10°
Parallel with hull
Bracket
Transducer
2 to 5°
5x20
5°
Taping
M5x14
Hull
Epoxy material