16
After cutting the fairing block, trial fit the block to the hull. It
is very important that the flat top surface of the transducer be
parallel to the water.
Installing the Thru-hull Transducer
1) Drill a 1/8” pilot hole from inside the hull to assure access
to tighten the housing nut and clearance for the transducer
cables. If there is any hull irregularity near the selected
mounting location, it may be desirable to drill from the
outside.
2) Use a 2” hole saw and drill the hole from the outside of the
hull. Sand or clean the area around the hole, inside and outside
to insure that the sealing compound will adhere properly to the
hull. Select a marine grade bedding/caulking compound and
use according to the instructions.
3) Remove the bronze hex nut from the housing and cable.
4) Uncoil the transducer cable and thread it through the hole
into the inside of the hull.
DANGER: DO NOT apply tension to the transducer cables
as this may sever internal connections. Apply a 1/8” thick
layer of sealant on the upper flat surface of the bronze housing
and fairing block (if used).
5) From the outside of the hull, push the cable and housing
into the 2” hole. Twist the housing slightly to squeeze out
excess sealant. Carefully confirm that the transducer is aligned
so that the rounded end (the front) is pointed directly toward
the front of the boat.
6) Install and tighten bronze hex nut (allow for swelling in
wooden hulls). Do not overtighten nut - especially if a
wooden fairing block is used as it will expand in water.
7) Remove excess sealant from the outside to assure smooth
water flow over the transducer.
DANGER: Wood hulls and fairing blocks will expand after
the boat is put back into the water, so it is important that the
transducer be only hand-tightened until the wood fully
expands. Otherwise the wood fairing block may crack.
DANGER: Be sure to check for leaks when the boat is placed
in the water. Allow at least 24 hours after installation for any
leak to appear.
Hull
Hull
Waterline
Transducer
Mount Transducer so it is Vertical
Hex Nut
Fairing
Block
Fairing
Block
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