
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 follow the installation instructions
provided with the new magnetic
pick
up coil.
SPEED
SENSOR
TEST
VALUES
VOLTAGE
(while
cranking)
1.5-2.5
VAC
RESISTANCE
(at
rest)
950
- 1
DOD
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
the 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 turn 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.
NOTE:
When replacing the Magnetic Pick-Up (MPU) it
MUST
be replaced without cutting and splicing into the
existing wiring cable. Doing so will cause a erratic
AC
signal to the controller.
Engines
& Generators
42
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