Installing The Thru-Hull Transducer - JRC FF50 Instruction Manual

Installing the Thru-Hull Transducer

You may wish to drill a 1/8" (3.2 mm) pilot hole from the inside to assure
access to the housing nut and clearance for the cable. Drill from the outside if
there is a strake or other hull irregularity.
Use caution when sanding or cleaning as harsh cleaning solvents such as
acetone weaken some epoxy resins and may damage the transducer.
Normally, this type of installation is performed by a professional. You may
want to seek some local assistance before attempting to mount this type of
transducer.
➀
Drill the hole from the outside using a 2" (50.8 mm) hole saw or paddle bit.
➁
Remove the hex nut from the housing and cable.
➂
Uncoil the transducer cable and thread through the hole to the inside of the
hull. NEVER pull or carry the sensor by the transducer cable, as you may
sever internal connections. NEVER hold the transducer in place by pulling
on the transducer cable.
➃
Apply a 1/8" (3.2 mm) thick layer of sealant on the transducer between the
upper flat surface of the transducer and fairing block, following the manufac-
turer's directions. Apply a thin layer up the side walls, 1/4" (6 mm) higher
than the hull and shim thickness, to seal the threads securing the housing
nut.
➄
Push the sensor housing (with sealant applied) into the drilled hole from the
outside of the hull. Twist the housing slightly to squeeze out excess sealant.
Confirm that the transducer is aligned so that the wedge portion is toward
the bow of the vessel.
➅
Tighten the hex nut (allow for swelling in wooden hulls).
➆
Remove excess sealant from the outside to assure smooth water flow over the
transducer.
➇
Check for leaks as soon as the boat is placed in the water, and AGAIN within
3 to 5 hours (small leaks may not be readily observed). Seal any leaks by
repeating the installation procedure.
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