General Motors — Change the Engine Ignition Timing (30--60 kW models only)
Adjustments · Engine ignition / distributor
From a General Motors service manual — check it applies to your exact model before use.
Before you start
- Disable the generator set before working on it to prevent accidental starting.
Procedure
- Loosen the distributor hold-down clamp screw.
- Clean the crankshaft pulley groove and engine timing plate mark; highlight timing marks with chalk.
- Connect an ignition timing light per its manufacturer's instructions (no. 1 spark plug is front left of engine).
- Set the ignition timing light adjustment to 28° BTDC for LP gas vapor.
- Place the master switch in the RUN position to start the generator set.
- Point the timing light at the timing plate mark and slowly turn the distributor until the pulley groove aligns with the mark.
- Place the master switch in the OFF position to stop the generator set.
- Tighten the distributor hold-down clamp to 25 Nm (18 ft. lb.) without altering distributor position.
- Disconnect the ignition timing light from the engine.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Ignition timing 28° BTDC for LP gas vapor
- Distributor hold-down clamp 25 Nm (18 ft. lb.)
Source: General Motors service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.