Garmin GT41-TH - Stainless Steel Thru-Hull DownVü/SideVü 500 W CHIRP 2 - Page 6

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2 Using the template, mark the location of the stem hole and anti-rotation bolts. 3 Drill a 3 mm (1/8 in.) pilot hole through the ull at the stem hole location, from outside the hole. The hole must be perpendicular to the water surface. 4 Using a 32 mm (1 1/ 4 in.) hole saw, cut the stem hole from outside the hull. The hole must be perpendicular to the water surface. 5 While holding a drill with a 13 mm (1/2 in.) bit plumb, drill the anti-rotation bolt holes through the hull from outside the hull. 6 Sand and clean the area around the holes. 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 bolts. Apply marine sealant around the base of the stem and À anti-rotation bolts on the transducer. 2 From outside the hull, insert the transducer through the mounting hole and seat it firmly against the hull. 3 From inside the hull, apply the included anti-seize compound to the exposed transducer stem and anti-rotation bolts. 4 From inside the hull, use slip-joint pliers or a crescent wrench to secure the included 35 mm hull nut , 26 mm nylon à washer , and 24 mm rubber washer to the transducer Ä Å stem. Do not over-tighten the hull nut. 5 From inside the hull, use slip-joint pliers or a crescent wrench to secure the included M8 nuts and 8 mm nylon washers to Æ the anti-rotation bolts. Do not over-tighten the M8 nuts. 6 Before the sealant hardens, remove all excess sealant on the outside of the exterior hull to ensure smooth water flow over the transducer. Installing the Transducer with a Fairing Block It is recommended that two installers complete these instructions, with one positioned outside the boat and one inside the boat. 1 Secure the bushings to the anti-rotation bolts and À Á transducer stem .  Metal Boat Hull Installation Instructions Thru-Hull Transducer in a Metal 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 Holes in a Metal Hull You should follow these instructions when you are using a fairing block to mount the transducer on a boat that has a metal hull. 1 Select a mounting location without surface irregularities or obstructions. 6 2 Apply marine sealant to the bushings, and at the base of the anti-rotation bolts and transducer stem. 3 Seat the transducer housing firmly within the fairing block à recess. 4 Apply marine sealant to the side of the fairing block that must contact the hull. 5 Apply marine sealant to the side of the backing block that Ä must contact the hull.

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2
From outside the hull, insert the transducer through the
mounting hole and seat it firmly against the hull.
3
From inside the hull, apply the included anti-seize compound
to the exposed transducer stem and anti-rotation bolts.
4
From inside the hull, use slip-joint pliers or a crescent wrench
to secure the included 35 mm hull nut
Ã
, 26 mm nylon
washer
Ä
, and 24 mm rubber washer
Å
to the transducer
stem.
Do not over-tighten the hull nut.
5
From inside the hull, use slip-joint pliers or a crescent wrench
to secure the included M8 nuts
Æ
and 8 mm nylon washers to
the anti-rotation bolts.
Do not over-tighten the M8 nuts.
6
Before the sealant hardens, remove all excess sealant on the
outside of the exterior hull to ensure smooth water flow over
the transducer.
Metal Boat Hull Installation Instructions
Thru-Hull Transducer in a Metal 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 Holes in a Metal Hull
You should follow these instructions when you are using a
fairing block to mount the transducer on a boat that has a metal
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 bolts.
3
Drill a 3 mm (
1
/
8
in.) pilot hole through the ull at the stem hole
location, from outside the hole.
The hole must be perpendicular to the water surface.
4
Using a 32 mm (1
1
/
4
in.) hole saw, cut the stem hole from
outside the hull.
The hole must be perpendicular to the water surface.
5
While holding a drill with a 13 mm (1/2 in.) bit plumb, drill the
anti-rotation bolt holes through the hull from outside the hull.
6
Sand and clean the area around the holes.
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 bolts.
Apply marine sealant
À
around the base of the stem and
anti-rotation bolts on the transducer.
Installing the Transducer with a Fairing Block
It is recommended that two installers complete these
instructions, with one positioned outside the boat and one inside
the boat.
1
Secure the bushings
À
to the anti-rotation bolts
Á
and
transducer stem
Â
.
2
Apply marine sealant to the bushings, and at the base of the
anti-rotation bolts and transducer stem.
3
Seat the transducer housing firmly within the fairing block
Ã
recess.
4
Apply marine sealant to the side of the fairing block that must
contact the hull.
5
Apply marine sealant to the side of the backing block
Ä
that
must contact the hull.
6