2
Seat the transducer housing firmly within the fairing block
recess.
3
Apply marine sealant to the face of the fairing block that
must contact the hull.
4
Apply marine sealant to the face of the backing block that
must contact the inner hull.
5
From outside the hull, insert the transducer cable and
transducer stem through the mounting hole.
6
From inside the hull, slide the backing block onto the
transducer stem and seat it firmly against the inner hull.
The fairing and transducer must be parallel to the keel.
7
From inside the hull, apply the included anti-seize compound
to the exposed transducer stem and anti-rotation bolt.
8
From inside the hull, use slip-joint pliers or a crescent wrench
to secure the backing block to the transducer stem with the
included 46 mm hull nut , nylon washer , and rubber
washer .
Do not over-tighten the hull nut.
9
From inside the hull, use slip-joint pliers or a crescent wrench
to secure the backing block to the anti-rotation bolt with the
included M8 nut and 8 mm washer .
Do not over-tighten the M8 nut.
10
Before the sealant hardens, remove all excess sealant on the
outside of the fairing block and exterior hull to ensure smooth
water flow over the transducer.
Non-cored/Fiberglass/Wooden Boat Hull
Installation Instructions
Thru-Hull Transducer in a Non-cored/Fiberglass Hull
with a Fairing Block
If the deadrise angle of your mounting location exceeds 5°, you
should use a fairing block to mount the device.
Drilling the Transducer Stem Hole and the Anti-Rotation
Bolt Hole in a Non-Cored or Fiberglass Hull
Before you can drill holes for the anti-rotation bolts, you must
drill the hole for the transducer stem, and you must cut the
fairing block (
).
You should follow these instructions when you are using a
fairing block to mount the transducer on a boat that does not
have a cored fiberglass hull.
1
Select a mounting location without surface irregularities or
obstructions.
2
Using the template, mark the location of the stem hole and
anti-rotation bolt.
3
Drill a 3 mm (
1
/
8
in.) pilot hole through the hull at the stem
hole location, from outside the hull.
The hole must be perpendicular to the water surface.
4
If the vessel has a fiberglass hull, place masking tape over
the pilot hole and surrounding area outside the hull to prevent
damage to the fiberglass.
5
If you taped over the pilot hole, use a utility knife to cut out
the hole in the tape.
6
While holding a 32 mm (1
1
/
4
in.) spade bit plumb, cut a hole
from outside the hull at the stem hole location.
The hole must be perpendicular to the water surface.
7
Sand and clean the area around the hole.
8
While holding a drill with a 9 mm (
3
/
8
in.) bit plumb, drill the
anti-rotation bolt hole through the hull.
The holes must be perpendicular to the water surface.
9
Sand and clean the area around the holes with a solvent
wash to remove dust particles.
Applying Marine Sealant to a Thru-Hull Transducer
You must apply marine sealant to the transducer to ensure a
tight, waterproof seal between the fairing block and the hull. Do
not apply sealant directly to the stem or anti-rotation bolt.
Apply marine sealant around the base of the stem and
anti-rotation bolt on the transducer.
4
