Before you can drill holes for the anti-rotation bolts, you must cut
the fairing block (
Cutting the Fairing Block
, page 2
).
The core must be cut and sealed carefully to protect against
water seepage.
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 template and hull
at the stem hole location.
The hole must be perpendicular to the water surface.
4
Place masking tape over the pilot hole and surrounding area
outside the hull to prevent damage to the fiberglass.
5
Using a 32 mm (1
1
/
4
in.) bit at the stem hole location, drill
from outside the hull through the outer skin
À
, inner skin
Á
,
and core
Â
.
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 14 mm (
9
/
16
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.
10
Seal the anti-rotation bolt holes with epoxy and allow the
epoxy to set thoroughly.
Applying Marine Sealant to a Thru-Hull Transducer
You must apply marine sealant to the water path to ensure a
tight, waterproof seal between the fairing block, transducer, and
hull.
Apply marine sealant between these components.
• Fairing block and hull
• Fairing block and transducer
• Stem and hull nut
• Anti-rotation bolts and holes
• Bushings, stem, and hull (if necessary)
Installing the Transducer in a Fiberglass Hull
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 damage to the hull.
1
From outside the hull, insert the transducer cable stem
through the bottom half of the cut fairing block .
2
Secure the cover plate to the bottom of the fairing block
with the screws .
3
Secure the M12 nuts to the bottom of the anti-rotation bolts
until no more than two threads are exposed between the
M12 nut and the bottom of the fairing block.
4
Insert the anti-rotation bolts into the bottom half of the cut
fairing block.
5
Apply marine sealant to the surface of the bottom half of the
fairing block that must contact the hull.
6
Pull the transducer cable, transducer stem, and anti-rotation
bolts through the mounting hole.
7
Place the bottom half of the fairing block firmly against the
outside hull.
The fairing block and transducer must be parallel to the keel.
8
From inside the hull, apply marine sealant to the surface of
the top half of the fairing block that must contact the hull.
9
Apply the included anti-seize compound to the exposed
transducer stem and anti-rotation bolts.
10
Pull the transducer cable, transducer stem, and anti-rotation
bolts through the top half of the fairing block.
11
Place the top half of the fairing block firmly against the inside
hull.
12
Use a crescent wrench to secure the transducer stem with
the included rubber 31 mm washer , nylon 31 mm washer
, and 40 mm hull nut .
NOTE:
Do not over-tighten the hull nut.
13
Use a crescent wrench to secure the top half of the fairing
block to the anti-rotation bolts with the included 13.4 mm
washers and M12 nuts .
NOTE:
Do not over-tighten the M12 nuts.
14
Apply sealant between the transducer sensor and the cover
plate, and in the holes around the stem and anti-rotation
bolts.
15
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.
Installing Ferrite Beads on the Cables
You must install all three included ferrite beads around the
power and network cables to comply with EMC standards. If you
do not install the ferrite beads, you may be in violation of
national EMC standards and other laws.
Securely snap each of the three ferrite beads around both the
power and Garmin Marine Network cables, as close to the
transducer stem as possible.
3
