Furuno GP-1870F, Operator'S Manual

Page: 153 / 209

13. INSTALLATION
13-5
13.3.2 Transom mount transducer
The optional transom mount transducer is very commonly employed, usually on rela-
tively 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 overtighten 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 nec-
essary, 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.
6. After the epoxy hardens, remove the
tape.
Transom
Transom
Stripe
Parallel with hull
Mount at the stripe.
Less than 10
°
Over 10
°
5x20
M5x14
5°
Taping
Bracket
Transducer
Hull
2 to 5
°
Epoxy material