User manual FURUNO FI-3001 OPERATORS MANUAL

[. . . ] 8 5 Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5. 1 Checking for Leaks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5. 2 Blanking Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5. 3 Installation in a Cored Fiberglass Hull. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] However, a fairing does provide a level mounting surface. Nearly all vessels have some deadrise angle at the transducer mounting location. If the transducer is mounted directly to the hull, the sound beam will be tilted off the vertical at the same angle as the deadrise angle. A fairing is recommended for metal housings if the deadrise angle at the mounting location exceeds 10. Caution: Never use a fairing with a plastic housing; the protruding transducer would be vulnerable to damage from impact. 4 Installation 4. 1 Hole Drilling Cored fiberglass hull--Follow separate instructions on page 4. Warning: Always wear safety goggles and a dust mask. Drill a 3 mm or 1/8" pilot hole from inside the hull. If there is a rib, strut, or other hull irregularity near the selected mounting location, drill from the outside. Note: If the pilot hole is drilled in the wrong location, drill a second hole in a better location. Apply masking tape to the outside of the hull over the incorrect hole and fill it with epoxy. Using the appropriate size hole saw, cut a hole from outside of the hull (see table on page 1). Note: All flush models require a countersink tool to create a "seat" in the hull. 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 residue inside the hull, remove it with either mild household detergent or a weak solvent (alcohol) before sanding. Metal hull--Remove all burrs with a file and sandpaper. 7 4. 2 Bedding Caution: Never pull, carry, or hold the transducer by its cable; this may sever internal connections. Remove the hull nut and any washer (see Figure 2). Also remove the cap nut and the transducer insert. Apply a 2mm (1/16") thick layer of sealant around the lip of the housing that contacts the hull and up the sidewall of the housing, 6 mm (1/4") higher than the combined thickness of the hull, washer(s), and the hull nut. This will ensure there is sealant in the threads to seal the hull and to hold the hull nut securely in place. Figure 2 5 Installing Note: Ignore any arrows on the housing, insert, and blanking plug. From outside the hull, push the housing into the mounting hole using a twisting motion to squeeze out excess sealant (see Figure 2). Slide the washer onto the housing inside the hull Aluminum hull less than 6mm (1/4") thick--Use an additional washer. Never use bronze, since electrolytic corrosion will occur. Remove the excess sealant on the outside of the hull to ensure smooth water flow over the transducer. After the sealant cures, inspect and lubricate the O-rings on the insert with silicone grease or petroleum jelly. [. . . ] Drill a 3 mm or 1/8" pilot hole from inside the hull (see Figure 3). If there is a rib, strut, or other hull irregularity near the selected mounting location, drill from the outside. If the hole is drilled in the wrong location, drill a second hole in a better location. Apply masking tape to the outside of the hull over the incorrect hole and fill it with epoxy. [. . . ]