Garmin Fishfinder 140 Owner's Manual page 15

To mount the transducer on a transom:
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.
4. Tighten the 10-32 locking nut until it touches the
mounting bracket, and then tighten 1/4 turn more. (Do
not overtighten.)
Fishfinder 90/140 Owner's Manual
190-00582-10_0A.indd 9
5. Place the first cable clamp on the transducer cable
approximately one third of the distance between the
transducer and the top of the transom. Mark the location.
Using a 1/8" bit, drill a pilot hole approximately 3/8" (10
mm) deep.
6. Attach the cable clamp using a 4 x 12 mm screw. Coat
the screw with marine sealant before installation. Repeat
steps 5 and 6 using the other cable clamp.
7. Route the transducer cable, as needed, to the Fishfinder.
DO NOT CUT THE CABLE. Avoid routing the cable with
electrical wires or other sources of electrical interference.
Installing Your Fishfinder
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