12
Installation
Hole Drilling
Cored fiberglass hull
—Follow separate instructions on page 17
1. Drill a 3mm or 1/8" pilot hole from inside the hull. If there is a rib, strut or other
hull irregularity near the selected mounting location, drill from the outside.
2. Using the appropriate size hole saw, cut a hole perpendicular to the hull from
outside the hull.
3. Sand and clean the area around the hole, inside and outside, to ensure that the
sealant will adhere properly to the hull. If there is any petroleum residue inside the
hull, remove it with either mild household detergent or a weak solvent (alcohol)
before sanding.
Metal hull
—Remove all burrs with a file and sandpaper.
Bedding
CAUTION
: Be sure the surfaces to be bedded are clean and dry.
Apply a 2mm (1/16") thick layer of marine sealant around the flange of the
housing that contacts the hull and up the sidewall of the housing.
The sealant
must extend 6mm (1/4") higher than the combined thickness of the hull, the
washer, and the hull nut
(Figure 4). This will ensure there is sealant in the threads
to seal the hull and to hold the hull nut securely in place.
Figure 4. Bedding and installing
housing
hull nut
insert
marine sealant on flange
stainless steel housing
marine sealant on flange
Copyright © 2017 Airmar Technology Corp
and sidewall of housing
and sidewall of housing
BOW
►
plastic housing
P717V
SS617V
safety wire
hull
washer
cap nut
(plastic)
electrode (4)
in fiberglass or wood hull
in fiberglass or metal hull