Furuno TZTL12F Installation Manual page 14

1. MOUNTING
Transducer preparation
Before putting your boat in water, wipe the face of the transducer thoroughly with a
detergent liquid soap. This will lessen the time necessary for the transducer to have
good contact with the water. Otherwise the time required for complete "saturation" will
be lengthened and performance will be reduced.
DO NOT paint the transducer. Performance will be affected.
1.5.2 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 (5x14) 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 transducer about 5° at the rear. This may require a
certain amount of experimentation for fine tuning at high cruising 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.
Bracket
Transducer
2 to 5°
6. After the epoxy hardens, remove the tape.
1-8
Transom
Less than 10° Less than 10°
Transom
Strake
Over 10°
Hull
Epoxy material
Parallel with hull
Mount at the strake.
5x20
5°
Taping
M5x14