Garmin Fishfinder 160C Owner's Manual - Page 14

Installing the Fishfinder 160C > Transducer Installation Mounting 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, marine sealant. To mount the transducer on a transom: 1. Position the transom mount at the selected location, making sure the transducer is parallel with the water line. Mark the center locations of each hole on the transom mount (see figures to the right). 2. Using the 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 1" from the point of the bit. 3. Apply marine sealant to the 5 x 30 mm screws. Attach the transducer to the transom using the 5 x 30 mm screws. Adjust the transducer 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 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). Note: After you install the transducer on a transom, it is highly recommended you test the installation (see page 10) Drill pilot holes here. Level Vertical Align with transom bottom. Transducer should extend 1/8" below fiberglass hulls or 3/8" below aluminum hulls. Bottom of Transom Keep parallel with water line. OK  Fishfinder 160C Owner's Manual