Installation In A Cored Fiberglass Hull - Maretron DST110 User Manual

4. Remove any excess sealant on the outside of the hull to ensure smooth water flow over
the DST110.
Warning: The O-rings must be intact and well lubricated to make a watertight seal.
5. After the sealant cures, inspect the O-rings on the insert (replace if necessary) and
lubricate them with the silicone lubricant supplied.
6. Slide the insert into the housing with the arrow on the top pointing forward toward the
bow. Screw the cap nut several turns until there is resistance. The arrow on the top of
the insert, the cable exit, and the arrow on the lip will all be aligned. Continue to tighten
the cap nut. Be careful not to rotate the housing and disturb the sealant. Hand tighten
only. Do not over tighten.
Warning: Always attach the safety wire to prevent the insert from backing out in the
unlikely event that the cap nut fails or is screwed on incorrectly.
7. Attach the safety wire.
Plastic housing – Attach the safety wire to one eye in the hull nut. Load the wire in a
counterclockwise direction and thread it through one eye in the cap nut. Thread the
wire through the eye a second time. Then, lead the wire through the eye in the insert.
Twist the wire securely to itself.
Metal housing—Wrap one end of the safety wire tightly around the housing
and twist it together with the long end. Lead the wire straight up and
through one eye in the cap nut. Thread the wire through the eye a second
time. Then lead the wire counterclockwise and through the eye in the
insert. Twist the wire securely to itself.
This is an important safety step, since attaching the safety wire to a
metal housing is different than attaching it to a plastic housing.
8. Route the cable to the network being careful not to tear the cable jacket when passing it
through the bulkhead(s) and other parts of the boat. Coil any excess cable and secure
it in place with zip-ties to prevent damage.
2.7.1.4 Checking for Leaks
Warning: Never install a thru-hull transducer and leave the boat in the water unchecked for
several days.
When the boat is placed in the water, immediately check around the thru-hull transducer for
leaks. Note that very small leaks may not be readily observed. It is best not to leave the boat
in the water for more than 3 hours before checking it again. If there is a small leak, there may
be considerable bilge water accumulation after 24 hours. If a leak is observed, repeat "Bedding"
and "Installing" immediately (see Sections 2.7.1.2 and 2.7.1.3).

2.7.2 Installation in a Cored Fiberglass Hull

The core (wood or foam) must be cut and sealed carefully. The core must be protected from
water seepage, and the hull must be reinforced to prevent it from crushing under the hull not
allowing the housing to become loose.
Warning: always wear safety goggles and a dust mask.
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