Operation Manual

51MS 241 C
7. Ignition system
Exercise extreme caution while
carrying out maintenance and repair
work on the ignition system. The
high voltages which occur can
cause serious or fatal accidents.
Troubleshooting on the ignition
system should always start with the
spark plug, b 3.5
– Remove fan housing, b 9.2
The contactless electronic ignition
system basically consists of a
control unit (1), flywheel (2),
switchgear (3) and solenoid
valve (4).
The ignition module accommodates
all the components required to
control the ignition timing and fuel
flow. There are only three electrical
connections leaving the control unit:
1. High voltage output for the
ignition lead.
2. Connector tab for black
lead – short circuit wire.
3. Connector tab for red lead
– M-Tronic.
2410RA142 TG
1
2
4
3
Testing of the ignition module is not
limited to only a spark test. If no
ignition spark is obtained or other
functions do not work, a diagnosis
must be carried out according to the
troubleshooting chart; replace
control unit or M-Tronic wiring
harness if necessary.
7.1 Ignition timing
Ignition timing is fixed and cannot
be adjusted during repair work.
Since there is no mechanical wear
in these systems, ignition timing
cannot get out of adjustment during
operation.
7.2 Pre-separator
– Remove fan housing, b 9.2
: Remove screw (1)
: Remove pre-separator (2), check
and replace if necessary
– Reassemble parts in reverse
order
2410RA143 TG
2
1
7.3 Control unit
– Remove fan housing, b 9.2
– Unplug the spark plug boot
: Remove holders (1) and (2)
carefully from the slits (arrows)
and open
: Pull the ignition lead (3) out of the
guide
: Lift retaining tab (arrow) and
remove angled plug (1)
– Examine insulating sleeve of the
angled plug, clean or replace if
necessary, b 7.7.2
2410RA144 TG
1
2
3
2410RA145 TG
1