Garmin GT41-TH - Stainless Steel Thru-Hull DownVü/SideVü 500 W CHIRP 2 - Page 3

Page 3 highlights

The hole must be perpendicular to the water surface. 6 Sand and clean the inner skin, core, and outer skin around the hole. 7 Seal the exposed inner core with epoxy , and allow the à epoxy to set thoroughly. 8 While holding a drill with a 9 mm (3/8 in.) bit plumb, drill the anti-rotation bolt holes through the hull from outside the hull. The holes must be perpendicular to the water surface. 9 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. 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. NOTE: When installing the transducer in a cored fiberglass hull, avoid over-tightening the nuts to prevent damaging the hull. 1 If the anti-rotation bolts are installed on your transducer, À remove them. 2 Apply marine sealant at the base of the anti-rotation bolts and transducer stem . Á 7 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. 8 From inside the hull, apply the included anti-seize compound to the exposed transducer stem and anti-rotation bolts. 9 From inside the hull, use slip-joint pliers or a crescent wrench to secure the backing block to the transducer stem with the included 35 mm hull nut , rubber 24 mm washer, and nylon Å 26 mm washer . Æ Do not over-tighten the hull nut. 10From inside the hull, use slip-joint pliers or a crescent wrench to secure the backing block to the anti-rotation bolts with the included M8 nuts and 8 mm washers . Ç È Do not over-tighten the M8 nuts. 11Before 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. Thru-Hull Transducer in a Cored Hull without a Fairing Block If the deadrise angle of your mounting location does not exceed 5°, you can mount the device without a fairing block. Drilling the Transducer Stem and Anti-Rotation Bolt Holes Using a Template WARNING The device must be installed with at least one of the included anti-rotation bolts. Failure to do so could result in the device rotating while the boat is moving and could cause damage to your vessel. 3 Seat the transducer housing firmly within the fairing block  recess. 4 Apply marine sealant to the face of the fairing block that must contact the hull. 5 Apply marine sealant to the face of the backing block that à must contact the inner hull. 6 From outside the hull, insert the transducer cable and Ä transducer stem through the mounting hole. You should follow these instructions if you are not using a fairing block or isolator plate to mount your transducer. 1 Trim the included transducer template. 2 Select a mounting location without surface irregularities or obstructions. 3 Using the template, mark the location of the stem hole and anti-rotation bolts. 4 While holding a 25 mm (1 in.) spade bit plumb, drill the transducer stem hole from outside the hull. The hole must be perpendicular to the water surface. 5 While holding a drill with an 9 mm (3/8 in.) bit plumb, drill the anti-rotation bolt holes from outside the hull. The holes must be perpendicular to the water surface. 6 Sand and clean the inner skin, core, and outer skin 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. 3

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The hole must be perpendicular to the water surface.
6
Sand and clean the inner skin, core, and outer skin around
the hole.
7
Seal the exposed inner core with epoxy
Ã
, and allow the
epoxy to set thoroughly.
8
While holding a drill with a 9 mm (
3
/
8
in.) bit plumb, drill the
anti-rotation bolt holes through the hull from outside the hull.
The holes must be perpendicular to the water surface.
9
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.
NOTE:
When installing the transducer in a cored fiberglass hull,
avoid over-tightening the nuts to prevent damaging the hull.
1
If the anti-rotation bolts
À
are installed on your transducer,
remove them.
2
Apply marine sealant at the base of the anti-rotation bolts and
transducer stem
Á
.
3
Seat the transducer housing firmly within the fairing block
Â
recess.
4
Apply marine sealant to the face of the fairing block that must
contact the hull.
5
Apply marine sealant to the face of the backing block
Ã
that
must contact the inner hull.
6
From outside the hull, insert the transducer cable
Ä
and
transducer stem through the mounting hole.
7
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.
8
From inside the hull, apply the included anti-seize compound
to the exposed transducer stem and anti-rotation bolts.
9
From inside the hull, use slip-joint pliers or a crescent wrench
to secure the backing block to the transducer stem with the
included 35 mm hull nut
Å
, rubber 24 mm washer, and nylon
26 mm washer
Æ
.
Do not over-tighten the hull nut.
10
From inside the hull, use slip-joint pliers or a crescent wrench
to secure the backing block to the anti-rotation bolts with the
included M8 nuts
Ç
and 8 mm washers
È
.
Do not over-tighten the M8 nuts.
11
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.
Thru-Hull Transducer in a Cored Hull without a
Fairing Block
If the deadrise angle of your mounting location does not exceed
5°, you can mount the device without a fairing block.
Drilling the Transducer Stem and Anti-Rotation Bolt Holes
Using a Template
WARNING
The device must be installed with at least one of the included
anti-rotation bolts. Failure to do so could result in the device
rotating while the boat is moving and could cause damage to
your vessel.
You should follow these instructions if you are not using a fairing
block or isolator plate to mount your transducer.
1
Trim the included transducer template.
2
Select a mounting location without surface irregularities or
obstructions.
3
Using the template, mark the location of the stem hole and
anti-rotation bolts.
4
While holding a 25 mm (1 in.) spade bit plumb, drill the
transducer stem hole from outside the hull.
The hole must be perpendicular to the water surface.
5
While holding a drill with an 9 mm (
3
/
8
in.) bit plumb, drill the
anti-rotation bolt holes from outside the hull.
The holes must be perpendicular to the water surface.
6
Sand and clean the inner skin, core, and outer skin 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.
3