Airmar Stuffing Tube - Manual (Page 2)

Metal hull—To isolate the stainless-steel stuffing tube from the
metal hull, slide the isolation bushing onto the stuffing tube.
Apply additional marine sealant to the surfaces of the isolation
bushing that will contact the hull, filling any cavities in and
around the bushing.
7. From outside the hull, push the stem of the stuffing tube
through the mounting hole using a twisting motion to squeeze
out excess sealant.
8. From inside the hull, slide the rubbery washer onto the stuffing
tube.
Metal hull—The rubbery washer must contact the hull. Do not
tighten the hull nut with the rubbery washer against the isolation
bushing. The stuffing tube will not be firmly installed. If
necessary, sand the isolation bushing until the rubbery washer
rests against the hull.
9. Screw the hull nut in place. Tighten it with slip-joint pliers.
Wood hull—Allow the wood to swell. After the hull has
expanded, tighten the hull nut securely.
Installing the Transducer & Fairing
Follow the instructions that came with the transducer and fairing.
After they are installed, follow the instructions below to seal the
cable inside the stuffing tube.
Sealing the Cable in the Stuffing Tube
WARNING: To form a watertight seal inside the stuffing tube,
stagger the splits in the compliant bushings.
1. The stuffing tube kit contains two sets of plastic washers. Four
are marked 8mm (0.33") diameter and four are marked 12mm
(0.47") diameter. Choose the set of plastic washers with the
smallest diameter that will fit around your cable. (Discard the
other set; it is not needed.)
2. Put two of the plastic-washer pieces around the cable and
press the halves together to form a closed ring (see Figure 2).
3. The kit also contains up to four sets of compliant bushings with
four bushings in each set. Choose the set of compliant bushings
with the smallest diameter that will fit around your cable.
(Discard the other sets; they are not needed.).
4. Place the four compliant bushings around the cable above the
plastic washer (see Figure 3). Arrange the bushings so that the
splits are staggered—not aligned. At the top of the stack, press
the second pair of plastic washers together to form a closed ring.
Be sure the plastic washers and compliant bushings are
stacked as shown in Figure 3.
5. To seal the cable inside the stuffing tube, push the plastic
washers and compliant bushings into the stuffing tube forming a
tight stack. Be sure the stack of plastic washers and compliant
bushings is seated securely inside the stuffing tube.
6. Screw the compression nut into the stuffing tube until it is snug.
Using slip-joint pliers, tighten the compression nut 2-1/2 turns.
This will compress the compliant bushings slightly to form a
watertight seal. Do not over-tighten.
Checking for Leaks
WARNING: Do not leave the boat in the water unchecked for
several days.
2
Copyright © 2005 - 2010 Airmar Technology Corp. All rights reserved.
Figure 3. Sealing the cable in the stuffing tube
installed exploded view
compliant
compression
plastic
plastic
nut
washer
bushings
washer
cable
Figure 2. Plastic washers —12mm (0.47”) diameter shown
exploded view
NOTE: stagger the
splits in the
Copyright © 2004 Airmar Technology Corp.
Copyright © 2006 ­ 2010 Airmar Technology Corp.
When the boat is placed in the water, immediately check around
the stuffing tube for leaks. Note that very small leaks may not be
readily observed. Do not leave the boat in the water unattended
for more than 3 hours before checking it again. If there is a small
leak, there may be considerable bilge water accumulation after 24
hours.If a leak is observed around the stuffing tube, tighten the
compression nut another quarter turn and see if the leakage
stops. If the stuffing tube continues to leak, repeat the installation
and sealing procedures immediately.
Parts
Bronze Stuffing Tube (B165) 33-511-01
Stainless-steel Stuffing Tube (SS571) 33-541-01
Plastic Washers 20-457-01
Compliant Bushings 20-488-01
Obtain parts from your sensor manufacturer or marine dealer.
Gemeco
Tel: 803.693.0777
(USA) Fax: 803.693.0477
email: [email protected]
Airmar EMEA Tel: +33.(0)2.23.52.06.48
(Europe, Middle East, Africa) Fax: +33.(0)2.23.52.06.49
email: [email protected]
AIRMAR
®
TECHNOLOGY CORPORATION
35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA
• www.airmar.com
compliant bushings