G3612 and G3616 Engines Caterpillar


Ignition Systems

Usage:

G3612 1YG
Ignition systems can cause electrical shocks. Avoid contacting the ignition system components and wiring.

Electronic Ignition

Do not inspect the valve mechanism or the transformers while the engine is operating. Personal injury or death may result.

The ignition system will be damaged if the ignition harness is removed during engine operation.

If the mode control switch is in the AUTOMATIC or START position and the wiring harness is connected, the ignition system may discharge and a spark plug will ignite. The spark plug will ignite any gas that has accumulated in that cylinder. The crankshaft and the driven equipment can move. Personal injury may result. The driven equipment could be damaged. Gas that has accumulated in the exhaust system can also be ignited.

Turn the mode control switch to the STOP or OFF/RESET position before connecting the wiring harness. When the mode control switch is in the STOP or OFF/RESET position, the ignition system is disabled.

Magneto

The storage capacitor in a breakerless magneto can be charged by turning the magneto by hand. The storage capacitor can be charged even when the wiring harness is disconnected from the magneto.

If the mode control switch is in the AUTOMATIC or START position and the wiring harness is being connected, the storage capacitor may discharge and a spark plug will ignite. The spark plug will ignite any gas that has accumulated in that cylinder. The crankshaft and the driven equipment can move. Personal injury may result. The driven equipment could be damaged. Gas that has accumulated in the exhaust system can also be ignited.

Before connecting the wiring harness to a breakerless magneto, discharge the storage capacitor to the ground. Use the following procedure to discharge the storage capacitor:

  1. Attach one end of a wire to the magneto housing.

  2. Contact the other end of the wire to the connector pins for the wiring harness that is on the magneto.

    You will hear a “snap” when the storage capacitor discharges.

  3. Ground all of the connector pins.

    This will ensure that no charge is in the magneto. Some breakerless magnetos have more than one storage capacitor.

Turn the mode control switch to the STOP or OFF/RESET position before connecting the wiring harness. When the mode control switch is in the STOP or OFF/RESET position, the ignition system is disabled.

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