John Deere 318 - Manual (Page 330)

3i
Ignition Control
Module Test—
For Machines
(S.N. 420001— )
Connect coil wires.
Ground spark plug
wires.
M45246 -UN-12JAN90
NOTE: Terminal (A) is
larger in diameter of
the two posts.
Measure ignition
module voltage.
Connect voltmeter red
lead to negative (—)
coil terminal (A) and
black lead to engine
ground.
Turn key switch to RUN
position.
Turn flywheel slowly by
hand. Voltage should
fluctuate back and forth
between battery voltage
and 1—1.5 volts.
VOLTAGE DOES NOT
SWITCH: Replace
ignition control module.
IMPORTANT: Always
replace ignition
module and trigger
ring as a set.
Make sure an insulator
is installed between the
ignition module and
gear cover.
Also, replace the
condenser whenever
the ignition module is
replaced.
3j
Ignition Timing
Check—For
Machines
(S.N. —420000)
NOTE: The engine
timing is preset at the
factory, however, a
slight timing change
can be made by
adjusting the ignition
points.
M37179 -UN-25JAN90
N
CAUTION: Failure to disconnect and
ground spark plug wires before turning
flywheel by hand may cause the engine to
start, resulting in injury.
Disconnect and ground spark plug wires.
Remove spark plugs.
Continued on next page
MX,159024025,50-19-16MAY95
Electrical System Diagnosis/Ignition Circuit Tests
TM1590 (17MAY95)
240-20-18
316, 318 & 420 Lawn and Garden Tractors
020895
240
20
18