4.
Marine Bedding/Sealing Compound; use
polysulfide,
polyurethane or
RTV types only. (Boatlife’s Liieseal caulk is a good choice.)
25A2.1 Fairing Block
Nearly all vessels have some
deadrise
angle at the transducer mounting
location. If the transducer were mounted directly to the
hull,‘the
sound
beam will be tilted off from the vertical at the same angle as the deadrise.
A fairing block (usually constructed of wood such as mahogany or teak)
providing a level mounting surface is strongly recommended. A Resin
Fairing Block (Product # M78694) for use with the 2528B transducer is
available from your Raytheon dealer for convenient installation.
25.422 Hole Drilling
1.
Start by drilling a
l/8”
( mm) pilot hole from inside the hull to assure
access to tighten the housing nut and clearance for the cable. If there is a
strake or other hull irregularity near the mounting location, it may be
desirable to drill from the outside. (If the pilot hole is drilled in a wrong
location, drill a second hole in a better location. Apply masking tape to the
outside of the hull over the incorrect hole(s), and
lill
with epoxy.)
2.
Using a
718”
hole saw or spade bit, drill the hole from the outside of the
hull. (For personal safety, use safety goggles and dust mask.)
3. Sand or clean the area around the hole, inside and outside, to assure
that the sealing compound will adhere properly to the hull. If there is any
petroleum residue inside the hull, remove it with a solvent such as lacquer
thinner, acetone or alcohol before sanding. (Make sure area is well venti-
lated since fumes from many solvents are toxic and/or flammable. Refer to
safety information appearing on the solvent container.)
25.423
2528B
Installation
1. Remove the skirted nut from the transducer housing and cable.
2. Uncoil the transducer cable and thread the transducer cable through
the fairing block and fish the cable into the inside of the hull. Never carry
the transducer by its cable or hold the transducer in place by applying
tension to the transducer cable.
INSTALLATION 36
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