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Sealing the Core with Casting Epoxy
To properly seal the core with casting epoxy, you must create a cylinder with an outer diameter of 73 mm (2
in.) to act as a spacer as the epoxy sets.
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1 Coat a 73 mm (2
/
in.) cylinder with wax.
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2 Insert the cylinder in the hole through the outer skin, and tape it in place on the outside of the boat.
3 Fill the space between the cylinder the core with casting epoxy.
4 After the epoxy has hardened, remove the cylinder, and sand and clean inside and around the hole.
The cored-fiberglass hull is now prepared, and you can complete the transducer installation.
Preparing a Non-Cored Fiberglass or a Metal Hull
1 From outside the hull, drill a 3 mm (
2 On a fiberglass hull, place masking tape over the pilot hole and surrounding area outside the hull to reduce
cracking of the gel coat.
3 Use a utility knife to cut a hole in the tape over the pilot hole.
4 From outside the hull, use a 73 mm (2
5 Sand and clean the inside of the hole and the area around the hole.
Installing the Transducer
Applying Marine Sealant to a Thru-hull Transducer
When installing the transducer, you must apply marine sealant to the water path to ensure a tight, waterproof
seal between the transducer and hull.
1 When instructed in the installation procedure, apply a 2 mm (
flange of the transducer housing where it contacts the hull.
2 Apply a layer of marine sealant along the threads of the transducer housing to fill the space between the
threads and the hull.
NOTE: The sealant on the threads should extend about 6 mm (
hull and secure the hull nut.
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1
/
in.) pilot hole at the transducer location.
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7
/
in.) hole saw to cut the transducer hole.
8
1
/
in.) layer of marine sealant to the inner
16
1
/
in.) above the inside of the hull to seal the
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7
/
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