Furuno 525Stid Msd Installation Instructions 17 276 01 R02 HS Fairing

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IMPORTANT

Use these instructions along with your sensor installation instructions.

These instructions supersede all other instructions where they differ.

17-276-01 rev. 02 7/01

INSTALLATION INSTRUCTION SUPPLEMENT

High Speed Fairing

For Sensor Models: B45, B46, B256, B260,

B744V, SS505, SS544V

Caution

: Never install a bronze housing in a metal hull because

electrolytic corrosion will occur.

Tools and Materials Needed

Digital level

or

bubble level & protractor

Band saw

or

hand saw

Safety goggles

Dust mask

Rasp

or

power tool

Electric drill

Drill bits, hole saw(s) (see Specifications Table 1)

Pilot hole 3mm

or

1/8"

Sandpaper

File (installation in metal hull)

Mild household detergent

or

weak solvent (alcohol)

Marine sealant (3M # 5200)

Slip-joint pliers

Mallet

For installation in a cored fiberglass hull, additional tools and

materials are needed (see page 4).

Identify Your Model

The model # appears in the recess of the fairing (see Figure 1).

Specifications Table 1

The min. hull thickness for all sensor models is 6mm (1/4").

Sensor

Model

Max. Hull

Thickness

(measured

perpendicular

to water surface)

Min. Fairing

Thickness Drill Bit for

Sensor

Drill Bit for

Anti-rotation

Bolt

B45 50mm (2") 35mm (1-3/8") 22mm

or

7/8" 10mm

or

3/8"

B46 40mm (1-5/8") 35mm (1-3/8") 22mm

or

7/8" 10mm

or

3/8"

B256 45mm (1-3/4") 38mm (1-1/2") 30mm

or

1-3/16" 13mm

or

1/2"

B260 45mm (1-3/4") 74mm (2-7/8") 33mm

or

1-5/16" 13mm

or

1/2"

B744V 19mm (3/4") 32mm (1-1/4") 51mm

or

2" 10mm

or

3/8"

SS505 56mm (2-1/4") 32mm (1-1/4") 22mm

or

7/8" 10mm

or

3/8"

SS505

in metal hull

56mm (2-1/4") 32mm (1-1/4") 25mm

or

1" 10mm

or

3/8"

SS544V 19mm (3/4") 32mm (1-1/4") 51mm

or

2" 10mm

or

3/8"

SS544V

in metal hull

19mm (3/4") 32mm (1-1/4") 54mm

or

2-1/8" 10mm

or

3/8"

WARNING

Installation of the anti-rotation bolt is mandatory!

Failure to install the anti-rotation bolt may result in the fairing rotating while the

boat is underway. The effect may be violent movement and loss of steering. This

could result in serious injury or death to passengers and/or damage to the boat or

other property.

triangular

cutting

Figure 1. High-Speed Fairing—B744V Shown

recess for

anti-rotation bolt

guide

model

number

2

Cutting the Fairing

1. Measure the deadrise angle of the hull at the selected mounting

location using a digital level, or bubble level and protractor (see

Figure 2).

2. Tilt the band saw table to the measured angle and secure the

cutting fence (see Figure 3).

Note

: Be sure to orient the fairing on the band saw so the angle

cut matches the intended side of the hull and not the mirror

image.

3. Place the fairing on the table so the cutting guide rests against

the fence. The end with the triangular recess will be pointing

toward you for installation on the port side of the boat or

pointing away from you for installation on the starboard side.

Note

: The end of the fairing with the triangular recess always

points forward toward the bow when installed.

4. There is a minimum thickness for the fairing at its thinnest

dimension (see Figure 2 and Specifications Table 1).

Warning

: Always wear safety goggles and a dust mask.

5. Recheck steps 1 through 4; then cut the fairing.

6. Shape the fairing to the hull as precisely as possible with a rasp

or power tool.

7. Use the remaining section of the fairing as the backing block.

Installation

Cored Fiberglass Hull

—Follow separate instructions on page 4.

Caution

: Never use solvents. Cleaners, fuel, paint, sealants, and

other products may contain strong solvent, such as acetone,

which attack plastics greatly reducing their strength.

Notice

: Never pull, carry, or hold the sensor by the cable as this

may sever internal connections.

Drilling a Hole for the Sensor

Warning

: Always wear safety goggles and a dust mask.

1. Drill a 3mm or 1/8" pilot hole perpendicular to the waterline from

inside the hull (see Figure 2). If there is a rib, strut or other hull

irregularity near the selected mounting location, drill from the

outside. (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.)

2. Using the appropriate size drill bit or hole saw, cut a hole from

outside the hull (see Specification Table 1).

3. 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.

Drilling a Hole for the Anti-rotation Bolt

Dry fit the sensor to locate the hole for the anti-rotation bolt.

1.

B45, B46, B256, B260, SS505

—Remove the hull nut from the

sensor (see Figure 2).

2. Thread the sensor cable through the large hole in the fairing

and through the mounting hole in the hull. Seat the sensor

firmly in the recess in the fairing (see Figure 4).

Note

: The sensor must be flush with the fairing. If it is recessed

more than 0.5mm (1/64") inside the fairing, you may carefully

file or sand the fairing flush with the sensor.

Warning

: Always wear safety goggles and a dust mask.

3. Attach the appropriate size drill bit to your drill (see

Specifications Table 1). Slide the sensor’s stem with the fairing

in place into the mounting hole. (

Be sure the triangular recess in

the fairing is pointing forward toward the bow

.) While holding the

assembly in place and using the bolt hole in the fairing as your

guide, drill a hole through the hull for the anti-rotation bolt.

4. Remove the assembly and cable from the mounting hole.

5. 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 any burrs around both holes with a file

and sandpaper.

Bedding the Sensor

1. Remove the sensor from the fairing.

2.

Stainless steel sensor in metal hull only

—Slide the

appropriate size isolation sleeve over the cable and onto the

stem of the sensor as far down as possible (see Figure 2).

Be

sure

the top of the isolation sleeve will be below the top of the

backing block to prevent the sleeving from interfering with

tightening the hull nut.

Caution

: To prevent electrolytic corrosion, never allow direct

contact between a stainless steel sensor and a metal hull!

Figure 2. SS544V with isolation sleeve

hull

aft view

min. fairing

thickness

deadrise

angle

slope of hull

parallel to

water surface

isolation

sleeve

Figure 3. Cutting the fairing

deadrise

angle

cutting

guide

cutting

band saw

table

bow end

for installation

on port side

fence

backing

block

fairing

hull nut

3

3. Apply a 2mm (1/16") thick layer of marine sealant to the sides of

the sensor that will contact the fairing and up the stem

6mm (1/4") higher than the combined thickness of the fairing,

hull, backing block, and hull nut. This will ensure there is marine

sealant in the threads to seal the hull and hold the hull nut

securely in place (see Figure 4).

Stainless steel sensor in metal hull

—Apply the marine

sealant to the outside of the sleeving instead of the stem itself.

4. Thread the sensor cable through the fairing and seat the sensor

firmly within the recess in the fairing.

5. Apply a 2mm (1/16") thick layer of marine sealant to the surface

of the fairing that will contact the hull.

Bedding the Anti-rotation Bolt and Installing

1. From outside the hull, thread the cable through the mounting

hole. Push the stem of the sensor (with the fairing in place) into

the mounting hole using a twisting motion to squeeze out excess

sealant (see Figure 4).

Caution

: Never strike the sensor.

2. From inside the hull, slide the backing block onto the sensor

cable and stem seating the backing block firmly against the hull.

Screw the hull nut in place and tighten it with slip-joint pliers.

Wood hull

—Allow for the wood to swell.

Fiberglass hull

—

Do not

over-tighten and crush the hull.

Stainless steel sensor in metal hull

—

Be sure

the top of the

isolation sleeve is below the top of the backing block to prevent

the sleeving from interfering with tightening the hull nut.

3. Apply a 2mm (1/16") thick layer of marine sealant to the anti-

rotation bolt, 6mm (1/4") higher than the combined thickness of

the fairing, hull, backing block, washer, and nut. This will ensure

that there is marine sealant on the threads to seal the hull and

hold the nut securely in place (see Figure 4).

4. Apply a 2mm (1/16") thick layer of marine sealant to one side of

the nut.

5. Push the bolt through the fairing and into the hull.

6. From inside the hull, slide the washer onto the bolt. Slide the nut

onto the bolt with the

sealant side facing the backing block

.

Screw the nut in place and tighten it with slip-joint pliers.

Wood hull

—Allow for the wood to swell.

Fiberglass hull

—

Do not

over-tighten and crush the hull.

7. Apply marine sealant to the

FLAT

side of the triangular plug.

Push the plug into the triangular recess in the fairing.

The

triangular plug fits one way only. Be sure

the curved side of the

plug is exposed, matching the curve on the outside of the

fairing. Tap it into place with a mallet.

Note

: For smooth water flow over the transducer, be sure that

the external surface of the installed triangular plug is FLUSH

with the external curved surface of the fairing.

8. Proceed with the installation instructions that came with your

sensor beginning with “Installing” step #4.

WARNING

Installation of the anti-rotation bolt is mandatory!

Failure to install the anti-rotation bolt may result in the fairing rotating while the boat is

underway. The effect may be violent movement and loss of steering. This could result

in serious injury or death to passengers and/or damage to the boat or other property.

Figure 4. Bedding and installing the anti-rotation bolt—B744V shown

⇐

BOW

anti-rotation

bolt

nut &

washer

triangular plug

backing

block

fairing

with curved

surface facing

outward

hull

detail

hull nut

marine sealant

marine

sealant

4

Installation in a Cored Fiberglass Hull

The core (wood or foam)

must

be cut and sealed carefully. The core

must

be protected from water seepage, and the hull

must

be

reinforced to prevent it from crushing under the hull nut allowing the

sensor to become loose.

Additional Tools and Materials Needed

Drill bit(s), hole saw(s) (see Specifications Table 2)

Cylinder

Wax

Tape

Casting epoxy

Preparing a Cored Fiberglass Hull

Warning

: Always wear safety goggles and a dust mask.

1. Drill a 3mm or 1/8" pilot hole from inside the hull (see Figure 5). 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.

2. Using the appropriate size drill bit or hole saw cut a hole from

outside the hull through the

outer

skin only (see Specification

Table 2).

Be sure

to hold the drill plumb, so the hole will be

perpendicular to the water surface.

AIRMAR

TECHNOLOGY CORPORATION

35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA

■

www.airmar.com

hull’s outer skin to

hull

outer skin

solid or hollow

cylinder

pour in

casting

epoxy

core

inner skin

Figure 5. Preparing a cored fiberglass hull

Dimension equal to

the thickness of the

ensure adequate

clearance

3. Using the appropriate size drill bit or hole saw cut through the

inner

skin and most of the core from inside the hull keeping

the drill perpendicular to the hull (see Specification Table 2).

The core material can be very soft. Apply only light pressure

to the hole saw after cutting through the inner skin to avoid

accidentally cutting the outer skin.

Caution

: The optimal interior hole diameter is affected by the

hull’s thickness and deadrise angle. It must be large enough

in diameter to allow the core to be completely sealed.

4. Remove the plug of core material, so the

inside

of the outer

skin and the inner core of the hull is fully exposed. Sand and

clean the inner skin, core, and the outer skin around the hole.

5. Coat a hollow or solid cylinder of the correct diameter with

wax and tape it in place. Fill the gap between the cylinder and

hull with casting epoxy. After the epoxy has set, remove the

cylinder.

Caution

: Always completely seal the hull to prevent water

seepage into the core.

6. 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, such as

alcohol, before sanding.

7. Follow the same procedure to prepare the hull for the anti-

rotation bolt (“Preparing a Cored Fiberglass Hull”, steps 2

through 6).

8. Proceed with the installation beginning with "Bedding the

Sensor" on page 2.

Specifications Table 2

Model Drill Bit for

Sensor

(outer skin)

Min. Size

Drill Bit for

Sensor

(inner cored

hull)

Drill Bit for

Anti-rotation

Bolt

(outer skin)

Min. Size

Drill Bit for

Anti-rotation Bolt

(inner cored hull)

B45 22mm

or

7/8" 35mm

or

1-3/8" 10mm

or

3/8" 19mm

or

3/4"

B46 22mm

or

7/8" 35mm

or

1-3/8" 10mm

or

3/8" 19mm

or

3/4"

B256 30mm

or

1-3/16" 40mm

or

1-5/8" 13mm

or

1/2" 25mm

or

1"

B260 33mm

or

1-5/16" 44mm

or

1-3/4" 13mm

or

1/2" 25mm

or

1"

B744V 51mm

or

2" 60mm

or

2-3/8" 10mm

or

3/8" 19mm

or

3/4"

SS505 22mm

or

7/8" 35mm

or

1-3/8" 10mm

or

3/8" 19mm

or

3/4"

SS544V 51mm

or

2" 60mm

or

2-3/8" 10mm

or

3/8" 19mm

or

3/4"