Humminbird SSTH 14 HW MSI+ T Guide D'installation page 3

STAINLESS STEEL THRU-HULL TRANSDUCER Installation Guide
Installation
Perform the procedures in the following sections to install the transducer on your boat.
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| Drill the Holes and Prepare the Leveling Block
Follow the instructions below for the installation type that matches your hull and deadrise. Review
the instructions and measurements indicated on the mounting template.
CAUTION! Use only the leveling block included with this transducer. Do NOT use a wooden leveling
block, as any swelling of the wood might cause the plastic on the transducer to shatter.
NOTE: A separately-purchased fairing block can also be used to create a hydrodynamic waterflow
around the transducer body. The design and fabrication of this block varies greatly with different
hull shapes; therefore, it should be customized by a qualified marine technician.
Standard Installation (Flat Hull, Deadrise less than 2°):
For an installation that needs to minimize the impact of a small obstruction, but where the deadrise
is less than 1 to 2 degrees, use the included leveling block (uncut), and mount it outside the hull.
1. Tape the template at the mounting location you selected in section 2.
2. From the outside of the hull, drill 3 small pilot holes (smaller than the centering bit of your drill
bit or hole saw), as shown on the template. Drill the holes perpendicular to the hull.
3. Use the center pilot hole (from the outside of the hull) to drill a 1 9/16" (3.9 cm) hole that is
sized to fit the threaded stem of the transducer. Drill the hole perpendicular to the hull.
4. Use the 2 outer pilot holes (from the outside of the hull) to drill 11/32" (.8 cm) holes that are
sized to fit the anti-rotation bolt. Drill the holes perpendicular to the hull.
5. Thoroughly clean and deburr the drilled holes and clean the outside of the hull.
6. The leveling block will be installed (uncut) on the outside of the hull. Proceed to Section 4:
Attach the Transducer.
Alternate Installation (Deadrise more than 2°):
For an installation where the deadrise is more than 2 degrees, use the included leveling block, cut at
the appropriate angle, to compensate for the deadrise.
1. Tape the template at the mounting location you selected in section 2.
2. From the outside of the hull, drill 3 small pilot holes (smaller than the centering bit of your drill
bit or hole saw), as shown on the template. Drill the holes perpendicular to the waterline.
3. Use the center pilot hole (from the outside of the hull) to drill a 1 9/16" (3.9 cm) hole that is
sized to fit the threaded stem of the transducer. Drill the hole perpendicular to the waterline.
4. Use the 2 outer pilot holes (from the outside of the hull) to drill 11/32" (.8 cm) holes that are
sized to fit the anti-rotation bolts. Drill the holes perpendicular to the waterline.
5. Thoroughly clean and deburr the drilled holes and clean the outside of the hull.
6. If the hull angle is greater than 2 degrees, cut the included leveling block and use both pieces
to level the transducer. The block should be cut to match the angle of the deadrise of the hull.
Δ Cut the leveling block into two equal pieces: one which mounts outside the hull and is shaped to
match the profile of the transducer, and one which mounts inside the hull and provides a level
surface for the fasteners.
Δ The thinnest wall of the outside leveling block must be at least 1" (25 mm).
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