A. Drill a
Hole Location For The Stuffing
Gaugingwhere the transducer mountingrods
see
is a strake
or other hull irregularity near the hardware sites for rods and stuffing tube.
If no possible interference is apparent from inside the hull, or outside the
hull, drill a 3 mm
diameter pilot hole. If a restriction is encountered,
you
to select another
location.
Note that sometimes you may have
to drill from the outside of the hull.
B.
Hole Preparation:
Drill a
28
mm (1
hole perpendicular to the outside hull surface for
the
tube from the outside
pilot hole location. Remove
all burrs and clean the area around the hole, inside and outside, to ensure
that the caulking will seal. It is important that the circumference of the
flanged nut that secures a non-welded stuffing tube from inside the hull be
in contact with the hull surface. Shims may be required.
C.
Mounting Hole Preparation:
Drill two 10 mm
holes in the hull and in the backing blocks for
the transducer mounting rods. To reduce drag, care must be taken to ensure
that the two rod holes are drilled parallel to the keel to maintain the
alignment of the transducer fore and aft. Note that the 2528L housing is
symmetrical and either end of the transducer could be positioned forward.
253.4
Installation
The order of assembly for the transducer is to first mount the
tube
into the hull. Follow by mounting the fairing block and backing blocks to
the hull with the two stainless steel rods provided. Finally the transducer
gets bolted onto the hull. Each step is
detailed in the following paragraphs.
1. Install The Stuffing
First.
Remove the rubber bushing, washer
and packing nut from the stuffing tube.
Select a marine grade polysulfide, ure-
thane or RTV bedding/caulking com-
pound for sealing the units to the hull.
Following the recommendations of the
caulking compound manufacturer,apply
a 3 mm
thick layer of caulking on
the
tube flange that makes con-
tact with the outside of the hull, and up
Packing Nut
Washer
Rubber Bushing
Washer
Nut
Vessel Hull
or
Fiberglass]
Tube
INSTALLATION 26
