Checking and setting
29
Adjusting ignition timing
Checking ignition timing
Ignition timing should be checked every
2,000 hours of operation.
Open cover on flywheel housing (arrow).
Before the first cylinder reaches TDC, you
will see angle markings on the flywheel.
These range from 40° before TDC to 0°.
There is a reference edge on the flywheel
housing to act as a corresponding marker.
The ignition point depends on the air ratio
λ at which the engine is being operated.
The setting is correct when ignition in cyl-
inder 1 takes place at 16° before TDC for
λ = 1 or 8° before TDC for λ = 1.5.
Check and set the ignition point with a
stroboscopic lamp. This must be done
with the engine running.
Connect up the stroboscopic lamp as fol-
lows.
D Connect connecting cable to the bat-
tery terminals: red clamp to positive ter-
minal, black clamp to negative terminal.
D Attach the inductive clamp transducer
to the ignition cable of cylinder 1 (end
remote from flywheel).
The clamp transducer senses the ignition
pulse and transmits it to the stroboscopic
lamp. The lamp flashes simultaneously
with the ignition spark of cylinder 1.
If the stroboscopic lamp is pointed at the
inspection hole, the selected ignition
marking appears to be stationary.
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