Garmin Fishfinder 140 Owner's Manual page 13

Do not mount the transducer behind
strakes, rivet lines, struts, fittings, water
intakes or discharge ports.
Make sure the transducer is below
water level when the boat is on plane
at high speed.
Apply marine sealant to all screw threads to prevent water from
seeping into the transom.
Fishfinder 90/140 Owner's Manual
Mount the transducer parallel with the
water line.
To mount the transducer on a transom:
Tool List (not included)—drill, 3/8" wrench or
socket, 5/32" and 1/8" drill bits, masking tape, #2
Phillips screwdriver, and marine sealant.
1. Position the transducer mount at the selected
transom location. Make sure the transducer
is parallel with the water line. Mark the center
locations of each hole on the transducer mount.
(See the figures on the next page.)
2. Using a 5/32" bit, drill the pilot holes approximately
1" (25 mm) deep at the marked locations. To avoid
drilling the holes too deep, wrap a piece of tape
around the bit at 1" from the point of the bit.
3. Apply marine sealant to the 5 x 30 mm screws.
Attach the transducer assembly to the transom
using the 5 x 30 mm screws. Adjust the transducer
assembly to extend beyond the bottom of the
transom approximately 1/8" (3 mm) on fiberglass
hulls or 3/8" (10 mm) on aluminum hulls. Adjust the
transducer assembly to be aligned parallel with the
water.
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