4.6.
Loose the flash switch, turn off the flash light.
4.7.
Turn off the ignition switch, take down the timing light.
Note: If the timing light doesn't work or works abnormally, please refer to the trouble-elimination
section of this manual, check the possible causes.
V. Adjustment of the ignition timing
Adjust the ignition timing according to the adjustment procedure and technical requirement according
to the repair manual. Never try to adjust the ignition timing when one is not sure of the adjustment
procedure and technical requirement.
VI. Inspection of the control part of the ignition advance
The control of the ignition advance is to guarantee that the ignition system can ignite at the
appropriate time during the compression stroke. The control of the ignition advance includes:
mechanical advance control, vacuum advance control, and electronic advance control, etc.
Note
: The inspection methods of the vehicle's ignition advance vary greatly. The following mentioned
method is the general method to inspect mechanical / centrifugal type ignition advance.
Then checking the ignition advancing angle, one should confirm that the reference ignition time and
the closing angle are correct.
Refer to the repair manual to understand correct inspection procedure and technical requirement.
Make sure that all the safety rules are observed.
VII. Inspection of the electronic ignition advance
The inspection of the electronic ignition advance control varies from vehicle to vehicle.
Please refer to the repair manual.
VIII. Trouble shooting of the timing lamp
If the timing light doesn't work or work abnormally, inspect the following items:
8.1.
Make sure that the connection between the battery jar clip of the timing light and the battery jar
is reliable.
8.2.
Make sure that the polarity connection between the battery jar clip of the timing light and the
battery jar is correct (the red clip should be connected to the anode (“+”) and the black clip
should be connected to the cathode (“-”).
8.3.
Make sure that the surface of the up/down ferrite magnetic block in the inductive signal pickup
device is clean. If necessary, clean the ferrite magnetic block according to the section of the
timing light maintenance and points for attention.
8.4.
Make sure that the inductive signal pickup device is correctly connected to the high voltage
wire of cylinder 1.
8.5.
Make sure that the spark plug of cylinder 1 works normally.
8.6.
Connect the inductive signal pickup device to the high voltage wire of the other cylinder 1,
press the flash frequency light, if the timing light flashes, check the spark plug of the cylinder 1,
and then conduct the following work.
Note
: Anything wrong with the low ignition voltage of the spark plug and the high voltage wire can
result in the abnormal operation of the timing light. Clamp the inductive signal pickup device at other
places of the high voltage wire to see if things will change.
The electromagnetic wave produced by some ignition systems and special high voltage wires (solid
wire core high voltage wire, high voltage wire of racing vehicle, high voltage wire of off road vehicle) is
higher than EMI and RFI standards, thus the testing equipment cannot work normally.
Contact relative manufacturers to learn the correct test requirement.
IX. Points for attention and maintenance
Clean the inductive signal pickup device
If the surface of the inductive signal pickup device is dirty or has oil stain, the timing light may work
abnormally.
Clean the working surface of the inductive signal pickup device at regular intervals.
