IS12 Combi
34
E04052
4.2.2 Cutting and Sealing the Holes
NOTE For the depth reading to be accurate, the depth transducer
must be as near vertical as possible. If the hull is angled in the
selected position, it may be necessary to use a fairing block cut
to the correct angle so that the transducer is vertical when fit-
ted (Fig 4.8). The fairing block should be glued to the inside
and outside of the hull using marine grade sealant and allowed
to set completely before proceeding. This is not necessary for the
speed transducer.
Equipment required -
- Drill
- Small (eg 5mm / 0.2in) drill bit
- 50mm (2.0in) hole saw
- Marine grade silicone sealant (eg Sikaflex)
- Fibre glass resin
- White spirit
Before drilling the holes, check the areas selected are as dry as
possible both inside and out - this is especially important on
GRP hulled boats to avoid possible osmosis damage.
First, drill a pilot hole in the selected position - a small hole is
much easier to repair if there is a problem with the location.
Once satisfied with the location, cut a 50mm (2.0in) hole.
NOTE If replacing an existing transducer, remove all old sealant and
check the hole for any damage around the edges, which may
need to be repaired. If the existing hole is larger than 50mm
(2.0in) then this will need to be professionally repaired and it
will be necessary to select an alternative location for the new
transducer. If the hole is too small for the new transducer, the
best way to drill a larger hole is to drive a wooden block into
the existing hole and use this to locate the guide bit of the hole
saw (Fig 4.9). This will prevent the hole saw slipping.
Drill here
New hole diameter
Wooden block
Fig 4.9 - Enlarging an existing transducer hole
Fairing block
Hull
Fig 4.8 - Using a Fairing Block
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