Silva TH52 installation manual Installing, Bedding

4.2Bedding

Caution: Never pull, carry, or hold the transducer by its cable; this may sever internal connections.

1.Remove the hull nut and any washer (see Figure 2). Also remove the cap nut and the transducer insert.

2.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.

1.From outside the hull, push the housing into the mounting hole using a twisting motion to squeeze out excess sealant (see Figure 2).

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.

3.Screw the hull nut in place. Hand-tighten only. Do not over-tighten.

4.Remove the excess sealant on the outside of the hull to ensure smooth water flow over the transducer.

5.After the sealant cures, inspect and lubricate the O-rings on the insert with silicone grease or petroleum jelly. Slide the insert into the housing. Seat the insert into place with a twisting motion until the key fits into the notch. Be careful not to rotate the outer housing and disturb the sealant. Screw the cap nut in place and hand-

11-8