4
Bedding
CAUTION
: Be sure all surfaces to be bedded are clean and dry.
CAUTION
: When installing the anti-rotation studs, use slip-joint
pliers placed near the bottom of the stud. Do not use pliers farther
up, as this will damage the threads.
1. Remove the hull nut (Figure 4,5, 6, or 7).
2. Apply a 2mm (1/16") thick layer of marine sealant to the surface
of the transducer that will contact the hull/fairing and up the stem.
The sealant must extend 6mm (1/4") higher than the combined
thickness of the hull, fairing and backing block (if used), and the
hull nut.
This will ensure there is marine sealant in the threads to
seal the hull and hold the hull nut securely in place.
3. Apply a 2mm (1/16") thick layer of marine sealant around the
anti-rotation studs
including the bottom
. This will ensure there is
marine sealant in the threads to secure the studs in the
transducer, seal the hull, and hold the nut securely in place.
4. Screw the anti-rotation studs into the holes in the transducer.
Using slip-joint pliers placed
near the bottom of the stud
, tighten
each one in turn. Do not use pliers farther up, as this will damage
the threads.
5.
Metal hull
—Use the isolation sleeving to cover the transducer
stem and the two anti-rotation studs. Cut the length of each
sleeve greater than the thickness of the hull.
Note that the
sleeves must not interfere with tightening the nuts.
Slide the
larger diameter isolation sleeve over the bedded transducer
stem. Slide the two remaining isolation sleeves over the bedded
anti-rotation studs. Slide the sleeves as far down as possible.
Apply a 2mm (1/16") thick layer of the marine sealant to the
outside of the three isolation sleeves.
6.
Fairing
—Thread the transducer cable through the fairing. Seat
the transducer firmly within the recess in the fairing. Apply a
2mm (1/16") thick layer of marine sealant to the following
surfaces:
• Fairing that will contact the hull
• Backing block that will contact the hull
• Hull nut that will contact the backing block
• Washers for the anti-rotation studs that will contact the
backing block
Figure 4. Bedding and installing with a fairing in a fiberglass or wood hull
Copyright © 2022 Airmar Technology Corp.
backing block
fairing
stem
anti-rotation
cable
transducer
nut (2) &
washer (2)
stud (2)
marine sealant on transducer, fairing, backing block,
hull
hull nut, anti-rotation stud (2), and washer (2)
hull nut
Figure 5. Bedding and installing with a fairing in a metal hull
Copyright © 2022 Airmar Technology Corp.
hull nut
backing block
fairing
stem
anti-rotation
cable
transducer
nut (2) &
washer (2)
stud (2)
marine sealant on transducer, fairing, backing block,
hull
hull nut, anti-rotation stud (2), washer (2) and sleeve (3)
isolation
sleeve (3)
detail
isolation sleeve
must be used
in a metal hull
marine
sealant
anti-rotation stud with isolation sleeve