Westerbeke 65B-FOUR Installationshandbuch PDF herunterladen (Seite 33)

TACHOMETER

TACHOMETER/HOUR

METER

The tachometer/hour meter used in propulsion engine

instrument panels contains two separate electrical circuits

with a common ground.

One circuit operates the hour meter

and the other the tachometer. The hour meter circuit operates

on 12 volts alternator charging voltage supplied to the (

terminal on the back

the instrument.

The tachometer circuit operates on AC voltage 6-8 volts, fed

from one

the diodes in the alternator and supplied to the

tachometer input terminal while the engine

running, and

the alternator producing battery charging voltage 13.0-14.8

volts DC.

The following are proceaures to follow when troubleshoot-

ing a fault in either

the two circuits in a tachometer/hour

meter.

Hour

Meter

Inoperative

Check for the proper DC voltage between ( +) and (-)

terminals.

Voltage present- meter

defective- repair or replace.

2. Voltage not present - trace (

+) and (-) electrical

connections for fault. (Jump 12 volts DC to meter (

terminal to verify the operation.)

Tachometer

Inoperative

Check for the proper AC voltage between tachometer input

terminal and (-) terminal with

the engine running.

Voltage present - attempt adjusting meter through

calibration access hole. No results, repair or replace

meter.

2. AC voltage not present

- check for proper alternator DC

output voltage.

3. Check for AC voltage at tach terminal on alternator to

ground.

4. Check electrical connections from tachometer input

terminal to alternator connection.

Tachometer

Sticking

Check for proper AC voltage between "tach inp."

terminal and (-) terminal.

2. Check for good ground connection between meter (-)

terminal and alternator.

3. Check that alternator

well grounded to engine block at

alternator pivot bolt.

Tachometer

Inaccurate

Using a hand held strobe tachometer reading front crank

shaft pulley speed. Adjust the engine speed to 1/2 rated

engine rpm

b. Using the coars adjustment, select

B, 4,

or 8 that

puts the panel tachometer rpm reading the closest to the

strobes tachometers rpm reading.

Using a 5/64 (2mm) allen wrench, adjust the calibration

pod on the panel tachometer to read the same as the

strobe tachometers rpm.

(+)TERMINAL

TACHOMETER

CHECK

(New

Installation)

NOTE:

a new installation having new instrument panels,

the tachometer may not

always,be correctly calibrated to the

engine's rpm. This calibration should be checked in all new

installations.

Warm up the engine to normal operating temperature.

Remove any specks on the crankshaft pulley with a clean

cloth and place a piece

suitable reflecting tape on the

pulley to facilitate use

a photoelectric type tachometer.

Start and idle the engine.

3. Aim the light

the tachometer onto the reflecting tape

to confirm the engine speed. Check the instrument panel

tachometer reading. Adjust the tachometer in the panel

by using the instrument coarse adjustment to calibrate the

instrument reading to the closest rpm that the photo tach

is showing. Then use the fine calibration adjustment to

bring the instrument to the exact reading as the photo

tach.

Set the tachometer to the idle speed (the engine idle speed

has been factory adjusted and the idle screws and high

speed screws have been locked in place).

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