Ignition System Timing - Check/Adjust - Perkins 4006 TRS Gas Operation And Maintenance Manual

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Maintenance Section

Ignition System Timing - Check/Adjust

Note: Tighten the spark plug by hand. Then tighten
the spark plug to a torque of 50 N·m (36 lb ft).
Ignition System Timing -
Check/Adjust
After maintenance has been performed on the
ignition system, check the timing of the ignition
system. Adjust the timing, if necessary.
The optimum ignition timing for a gas engine varies
according to several factors:
• Compression ratio of the engine
• Inlet air temperature
• Methane number of the gas
Note: Refer to this Operation and Maintenance
Manual, "Plate Locations and Film Locations" to find
the ignition timing.
1. Install a timing light to the lead on number six
cylinder for the 4006TRS engine or number eight
cylinder for the 4008TRS engine.
Note: The leads for the timing light must not come in
contact with the exhaust manifold.
i08259049
Illustration 57
Typical example
2. Operate the engine and check the timing marks on
the flywheel.
3. If necessary, adjust the ignition timing. Remove the
cap (1). By using a suitable tool, rotate the screw
(2) to adjust the ignition timing.
4. Ensure that the cap (3) is not removed. This is set
for the application in the factory.
5. Install the cap (1) when the ignition timing is
correct. Remove the timing light.
• Rotating the screw (2) clockwise advances the
ignition timing.
• Rotating the screw (2) counterclockwise retards
the ignition timing.
Note: For engines that are installed with a detonation
sensor, the timing is controlled by the detonation
system. Contact your Perkins distributor or Perkins
dealer for more information.
SEBU8190-02
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