GENERATOR
SERVICING
TESTING
THE
MAGNETIC
PICK
UP
COIL
Test the speed sensor connector for voltage and resistance
values.
If
the values are correct, remove and inspect the magnetic
pick up. With the wires disconnected, unscrew the
magnetic pick
up
from the generator housing and visually
inspect the contact end.
If
any damage
is
detected, replace
the unit.
NOTE:
Carefully/allow the installation instructions
provided with the new magnetic pick
up
coil.
SPEED
SENSOR
TEST
VALUES
Voltage
(whIle
cranking)
1.5
-
2.5
VAC
Resistance
(al
rest)
950
-1000
ohm
MAGNETIC
PICK·UP
[MPU]
INSTALLATION
The MPU is installed
in
the threaded opening
on
the side
of
the flywheel bellhousing. This positions the MPU over
the teeth of the flywheel ring gear.
Viewing through this opening, manually rotate the engine
crankshaft so as to position the flat
of
one of tlle ring
gear's teeth directly under the opening. Thread the
MPU
into the opening until
it
gently contacts the
flat
of this
tooth (Thread is 3/8" x 24). Back the
MPU
out of the
opening one tum and then lock it
in
this position with
the
jam
nut. This will position the end
of
the MPU
approximately 0.030 inches away from the flats of the
ring gear teeth.
To
en~ure
the MPU is positioned correctly, slowly rotate
the crankshaft by
360" by hand to assure there is no
physical contact between the MPU and the ring gear teeth.
If
contact
is
felt between the MPU and the flywheel teeth,
the
MPU may be damaged. Remove the MPU and inspect
it.
Replace
if
necessary and repeat the above
installation procedure.
WIRES
a
'
NOTE:
When replacing the Magnetic Pick-Up (MPU) it
MUST
be
replaced without cutting
and
splicing into the
~MIPU-I~AGINE1'ICPICK-UP
existing wiring cable. Doing so will cause a erratic
AC
. signal to the controller.
~
0.03010
"""
WESTERBEKE
Engines & Generators
87
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