Furuno GP-1670F Operator's Manual page 152

13. INSTALLATION
disturbed flow of water around the transducer. The fairing block should be smaller
than the transducer itself to provide a channel to divert turbulent water around the
sides of the transducer rather than over its face.
Upper Half
Lower Half
Saw along
slope of hull.
3. Drill a hole just large enough to pass the threaded stuffing tube of the transducer
through the hull, making sure it is drilled vertically.
4. Apply a sufficient amount of high quality caulking compound to the top surface of
the transducer, around the threads of the stuffing tube and inside the mounting
hole (and fairing blocks if used) to ensure watertight mounting.
5. Mount the transducer and fairing blocks and tighten the locknut. Be sure that the
transducer is properly oriented and its working face is parallel to the waterline.
Hull
Note: Do not over-stress the stuffing tube and locknut through excessive tightening,
since the wood block will swell when the boat is placed in the water. It is suggested
that the nut be tightened lightly at installation and retightened several days after the
boat has been launched.
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.
13-4
Hole for
stuffing tube
Flat Washer
Rubber Washer
Fairing
Block
Hull
Deep-V Hull
Flat Washer
Rubber
Washer
Flat Hull
BOW
Cork
Washer