Westerbeke 20B TWO Tehnical Manual page 82

e. Apply all load Including the lamps.
f. Increase engine speed until normal alternator speed
is attained. Read the maximum indication of the
ammeter at 13.5 V
of
voltmeter indication. Output
current must conform to the specification.
AHernator Removal
1. Disconnect the battery cable.
2.
Disconnect the lead wire from terminal "S" on the back
of
the alternator.
3. Disconnect the alternator connector.
4.
Loosen the alternator brace bolt and support bolt.
Push the alternator toward the engine and remove the
fan belt.
5. Dismount the alternator.
Alternator Disassembly
1.
Remove the three through bolts.
2. Heat the rear bracket around the rear bearing up to
50 - 60° C
(with a solder iron) and separate the bracket
from the stator coil.
CAUTION
Ammeter
r-----~+~Ar-----~~
Checking for Output
Characteristic
Terminal
Current
I
voltage (V)
(A)
I
I
15A
14
0 I
I
I
:
No-load
1
35A
14 8
I
output
I
50A 13.5 24
15A 14
15
maximum
Loaded
35A 14
30
output maximum
50A 13.5
50
maximum
Pry open the alternator with a screwdriver blade inserted into the clearance between the stator
core and front bracket. Se careful not to insert the blade too deep.
3. Grip the rotor in a vise, remove the pulley nut, and pull out the pulley, fan, and spacer.
4. Pull out the rotor assembly from the front bracket.
Westerbeke Engines
80
Speed
(rpm)
1,300
maximum
1,300
maximum
1,300
maximum
2,500
maximum
2,500
maximum
2,500
maximum