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DST110 User's Manual
2. Using the 51 mm or 2" hole saw, cut a hole from outside the hull.
Flush housing – Use a countersink tool to make a "seat" in the hull.
3. Sand and clean the area around the hole, inside and outside, to ensure that the sealant
will adhere properly to the hull. If there is any petroleum inside the hull, remove it with
either mile household detergent or a weak solvent (alcohol) before sanding.
Metal hull – Remove all burrs with a file and sandpaper.
2.7.1.2 Bedding
Apply a 2 mm (1/16") thick layer of marine sealant around the lip of the housing that contacts
the hull and up the sidewall of the housing. The sealant must extend 6 mm (1/4") higher than the
combined thickness of the hull, washer(s), and hull nut (see Figure 3). This will ensure there is
sealant in the threads to seal the hull and hold the hull nut securely in place.
2.7.1.3 Installation
Caution: Never pull, carry, or hold the DST110 by the cable as this may damage internal
connections.
1. From outside the hull, push the housing into the mounting hole using a twisting motion to
squeeze out excess sealant (see Figure 3). Align the arrow on the lip of housing to point
forward toward the bow. If the DST110 is not installed on the centerline, angle the
housing slightly toward the centerline to align it with the water flow.
2. From inside the hull, slide the washer onto the housing.
Aluminum hull less than 6 mm (1/4") thick – Use an additional rubbery, fiberglass, or
plastic washer. Never use bronze since electrolytic corrosion will occur. Never use wood
since it will swell, possible fracturing the plastic housing.
3. Screw the hull nut in place.
Wood hull – Allow the wood to swell before tightening the hull nut securely.
Plastic housing – Do not clamp tightly on the wrenching flats, possibly causing the
housing to fracture.
Plastic hull nut – Hand-tighten only. Do not over tighten.
Metal hull nut-- Tighten with slip-joint pliers.
Page 6
Figure 3 – Bedding and Installation
Revision 1.3
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