Kohler MAGNUM M18

SECTION 8
ELECTRICAL SYSTEM AND COMPONENTS
3. Loosen the hex. flange screw so the magnet pulls
module against feeler gauge. Tighten the hex.
flange screw securely.
4. Remove the feeler gauge or shim stock. Due to
the pull of the magnet, the bracket and hardware
will flex slightly. The magnet-to-module air gap
should be within the range of .008/.012".
5. Rotate the flywheel back and forth; check to make
sure the magnet does not strike the module.
Check gap with feeler gauge and readjust if
necessary.
6. Install the kill lead to kill terminal of module. Rein-
stall the blower housing.
Kill Lead With Optional Diode
An optional in-line diode was installed in the kill lead
of some early Magnum engines, to protect the module
from buming out, if voltage was applied to the kill
lead. Refer to Figure 8-7. The diode was later added
10 the internal circuitry of the module, so they would
all have the same protection.
Heat Shrink
Tubing
Diode /
=f ==: Е
\
To
Kill
Switch
Coated
Terminal
Or
OFF
Position
Fiberglass
Of
Keyswitch
Sleeving
Figure 8-7. Kill Lead With In-Line Diode.
The diode is rated such that diode failure is highly un-
likely. If the diode should fail, however, two failure
modes are possible. If the diode fails in the shorted
mode and voltage is applied to the kill lead, the mod-
ule will bum out. If the diode fails in the open mode,
the engine will continue to run when the kill switch is
placed in the "off" position. If either of these symp-
toms is experienced, the diode should be tested.
8.4
DIODE TEST
Use an ohmmeter (or continuity tester) to test the
diode. Set the meter on Rx1 scale and zero.
1. Disconnect the kill lead terminais from the kill
switch and ignition module.
2. Connect the meter/tester leads to the kill lead ter-
minals. Then reverse the leads.
In one direction the resistance should be infinity
ohms (no continuity). With the leads reversed,
some resistance (continuity) should be measured.
3. If the resistance is infinity ohms in both directions
(no continuity), the kill lead or diode is open and
the wiring hamess must be replaced. Refer to the
appropriate Parts Manual for the correct part
number.
If the resistance In 0 ohms in both directions, and
the module is burned out; replace the module
only.
Spark Plugs
Engine misfire or starting problems are often caused
by spark plugs in poor condition or with improper gap
setting.
SERVICE
Every 100 operating hours remove the spark plugs,
check condition, and reset gaps or replace with new
plugs as necessary. Refer to Figure 8-8.
Wire Gauge
Ground
Etectrode gr ORE
0. .035” Gap
Figure 8-8. Servicing Spark Plug.