AIRMAR
®
TECHNOLOGY CORPORATION
35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA
■
www.airmar.com
6
Copyright © 2004, 2006, 2007 Airmar Technology Corp. All rights reserved.
3. Grasp the pull ring and remove the paddlewheel insert with a slow
pulling motion.
Note
: In the unlikely event that the paddlewheel insert cannot
be removed, see “Servicing the Valve Assembly”.
Warning
: Always attach the safety wire to prevent the insert from
backing out in the unlikely event that the cap nut and/or insert nut
fails or is screwed on incorrectly.
4. Slide the blanking plug into the housing. Seat it into place with a
pushing twisting motion until the keys fit into the notches (see
Figure 6). Screw the insert nut in place and
HAND-TIGHTEN
only.
Do not
over tighten. Reattach the safety wire (see Figure 7).
Cleaning the Multisensor
Aquatic growth can accumulate rapidly on the multisensor’s surface,
reducing its performance within weeks. Clean the surface with mild
household detergent and a Scotch-Brite® scour pad. If fouling is
severe, push out the paddlewheel shaft using a spare shaft or a 4D
finish nail with a flattened point. Then lightly wet sand the
paddlewheel with fine grade wet/dry paper.
Servicing the Paddlewheel Insert
The water lubricated paddlewheel bearings have a life of up to 5 years
on low-speed boats [less than 10kn (11MPH)] and 1 year on high-
speed vessels. Paddlewheels can fracture and shafts can bend due to
impact with water borne objects and mishandling in boat yards.
O-rings
must
be free of abrasions and cuts to ensure a watertight
seal. Order a replacement Paddlewheel Kit No. 33-113.
1. Using the new paddlewheel shaft, push out the old shaft about 6 mm
(1/4"). With pliers, remove the old shaft (see Figure 6).
2. Place the new paddlewheel in the cavity with the flat side of the
blade facing the same direction as the arrow on the top of the
insert.
3. Tap in the new shaft into place until the ends are flush with the
sides of the insert.
4. Install two O-rings in the
lower
groves near the paddlewheel.
Do not
place them near the pull ring.
5. The remaining two O-rings are placed in a similar position on the
blanking plug.
6. To reinstall the paddlewheel insert, see “Installing the Paddlewheel
Insert” on page 4.
Servicing the Valve Assembly
Should the valve fail, remove it for servicing. Order a replacement
Paddlewheel and Valve Kit No. 33-218.
WARNING: The blanking plug cannot be secured without the
valve assembly.
After removing the valve assembly, temporarily
insert the blanking plug, but do not leave the boat in the water
unattended.THIS IS NOT A WATERTIGHT OR SECURE SEAL!
Warning: O-rings must be intact and well lubricated to make
a watertight seal.
1. On the blanking plug, inspect the O-rings (replace if necessary) and
lubricate them with silicone lubricant or petroleum jelly (Vaseline®)
(see Figure 6).
2. Remove the safety wire and unscrew the
cap
nut (see Figure 7). With
the blanking plug ready in one hand,
remove the paddlewheel insert
and valve assembly as one unit
by grasping the pull ring and pulling
upward. Rapidly replace the valve assembly with the blanking plug to
minimize the flow of water into the boat.
TEMPORARILY
secure it
with the safety wire.
3. Separate the paddlewheel insert from the valve assembly by
unscrewing the insert nut (see Figure 6). Grasp the pull ring and
pull slowly upward.
Warning
: If a new valve assembly is required and not immediately
available, the valve sleeve must be reinstalled in the multisensor
housing for a watertight seal. Remove the flap valve, spring pin,
and spring from the sleeve before reinstalling.
4. Clean, repair, or replace the valve
assembly so the flap valve moves
freely and seats against the
sleeve (see Figure 10).
WARNING: The O-rings must be
intact and well lubricated for a
watertight seal.
5. To reinstall the valve assembly,
inspect the O-rings on the paddle-
wheel insert (replace if necessary)
and lubricate them with silicone
lubricant or petroleum jelly
(Vaseline®) (see Figure 6)
6. Slide the paddlewheel insert into
the valve assembly. Seat it in
place with a twisting motion until
the keys fit into the notches. Secure the paddlewheel insert with the
insert nut.
HAND-TIGHTEN
only.
Do not
over tighten.
Caution
: Be careful to avoid cross threading the cap nut.
7. Remove the safety wire from the multisensor. With the combined
valve assembly and paddlewheel insert ready in one hand, remove
the blanking plug. Slide the assembly into the multisensor housing
with the arrow on the top pointing forward toward the bow
.
Be sure
the cable fits into the cable channel and the notch in the sleeve fits
into the key in the housing (see Figure 10). (A pushing twisting
motion will locate the key.) Screw the
cap
nut in place and
HAND-
TIGHTEN
only.
Do not
over tighten.
Warning
: Always attach the safety wire to prevent the insert from
backing out in the unlikely event that the insert nut and/or cap nut
fails or is screwed on incorrectly.
8. Reattach the safety wire (see Figure 7).
Replacement Multisensor & Parts
The information needed to order a replacement Airmar multisensor is
printed on the cable tag.
Do not
remove this tag. When ordering,
specify the part number, date, and frequency in kHz. For convenient
reference, record this information at the top of page one.
Lost, broken, or worn parts should be replaced immediately.
Paddlewheel Kit
33-113
Paddlewheel & Valve Kit
33-535-01
Obtain parts from your instrument manufacturer or marine dealer.
Gemeco (USA)
Tel:
843.394.3565
Fax:
843.394.3736
email:
Airmar Europe
Tel:
+45.45.81.04.18
Fax:
+45.45.81.04.93
email:
Model
Cap Nut
Hull Nut
Standard
Fairing
High-
Performance
Fairing
Blanking
Plug
Insert
B744V
04-234-1
02-030
04-469-01 33-476-01
33-551-01 NA
B744VL
04-234-1
02-030
04-469-01 33-476-01
NA
NA
Figure 10. Valve assembly
sleeve
flap
spring
spring
cable
notch
channel
valve
pin
Copyright © 2005 Airmar Technology Corp.
