Furuno GP-7000F - Manual (Page 15)

9
Procedure for installing the thru-hull mount transducer
1. With the boat hauled out of the water, mark the location chosen for mounting the transducer
on the bottom of the hull.
2. If the hull is not level within 15° in any direction, fairing blocks made out of teak should be
used between the transducer and hull, both inside and outside, to keep the transducer face
parallel with the water line. Fabricate the fairing block as shown below and make the entire
surface as smooth as possible to provide an undisturbed flow of water around the transducer.
The fairing block should be smaller than the transducer itself to provide a channel to divert tur-
bulent water around the sides of the transducer rather than over its face.
Construction of fairing block
Transducer mounting
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 trans-
ducer, 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 locking nuts. Be sure that the trans-
ducer is properly oriented and its working face is parallel to the waterline.
Note: Do not over-stress the stuffing tube and locking nuts through excessive tightening, since
the wood block will swell when the boat is placed in the water. It is suggested that the nut be tight-
ened lightly at installation and retightened several days after the boat has been launched.
BOW Hole for
stuffing tube
Upper Half
Lower Half
Saw along slope
of hull.
Fairing
Block
Flat Washer
Rubber Washer
Hull
Deep-V Hull
Hull
Flat Washer
Rubber Washer
Flat Hull