Doosan G643, Руководство по обслуживанию

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G643(E) Service Manual Chapter 4. Engine Electrical System 124
Figure 38. Topside of Engine Showing Position
of Cylinders
NOTE: This completes the initial ignition timing. The
final ignition adjustment can be made at engine
start-up using the software Service Tool.
Final Timing Verification
To verify the mechanical timing adjustment of the
distributor you will need to lock the spark using the
Service Tool Test Screen and use the timing light to
verify adjustment.
NOTE: Service Tool software (Moto TuneViewer)
and the security Crypt Token is obtainable by
certified technicians through authorized dealers.
1. Without starting the engine turn the Key switch to
the ON position and open the Service Tool
Display Test Screen. The Spark Control Lock
parameter should be “Unlocked” as in (Figure 42).
The Spark Offset should read 0.00 and “OFF” in
the Units column of the display. When a value is
entered in the Spark Offset, the offset value is
added to the value displayed in the Spark
Advance parameter.
NOTE: You must always return the Spark Offset
value to 0.00 before closing the Service Tool or the
offset will be applied during engine operation
causing inaccurate ignition timing with the possibility
of misfire or engine damage.
Figure 42. Spark Control Lock Parameter
“Unlocked”
2. The preferred reference timing to use for
verification with a timing light is 10 degrees BTDC.
In Figure 42 the Spark Advance with the engine
not running is 5.0° BTDC. To lock the spark at 10°
BTDC a Spark Offset value of 5.0 would need to
be entered (5.0 + 5.0 = 10). Enter the appropriate
offset value that will equal 10 when added to your
engine’s spark advance. (10 – Spark Advance =
Spark Offset). Once an offset value is entered the
“OFF” description will change and display
“WARNING” to alert you that the offset value is
not set to 0.00.
Figure 43. Spark Control Lock Parameter
“Locked”
3. Select the Spark Control Lock “Unlocked” check
box. The check box display will change to read
“Locked” as in Figure 43. You have now locked
the SECM ignition timing at a fixed value (Spark
A Spark Offset).