Engine Ignition Timing Adjustment Procedure

Engine Ignition Timing Setup

Commissioning an engine's power system involves precisely timing the spark plug ignition within each cylinder. This ensures the spark plugs ignite the fuel-air mixture at the precise moment for optimal combustion.

1. Breaker Contact Adjustment

Since the adjustment of the breaker contacts directly influences the ignition point, this operation must be performed first. Use feeler gauges inserted between the contacts to set their maximum separation. This separation should be approximately 0.30 to 0.40 mm.

2. Positioning Piston 1 for Ignition

Once the breaker contact separation is adjusted, proceed to position cylinder #1's piston at the end of its compression stroke and the beginning of its power stroke (ignition point). To do this:

• Remove the spark plug from cylinder #1.
• Cover the spark plug hole with your finger.
• Rotate the engine until you feel compression pressure. (To rotate the engine, engage 4th or 5th gear and gently push the vehicle.)

3. Aligning Crankshaft/Flywheel Marks

While rotating the engine, simultaneously observe the markings on the flywheel or crankshaft pulley. These marks must be aligned. During the setup operation, rotate the engine in its normal direction until the mark on the crankshaft pulley or flywheel (whichever applies) coincides with the fixed reference on the engine housing. Always account for the initial advance setting specified by the manufacturer.

4. Installing the Distributor

Once the marks are aligned, cylinder #1 is ready for ignition. Now, mount the distributor onto the engine. Ensure the distributor rotor points to the output terminal on the distributor cap that is marked for cylinder #1.

5. Fine-Tuning Ignition with a Test Lamp

After installing the distributor, you can use a test lamp connected between the distributor's power input terminal and ground. With the ignition switch on, slowly turn the distributor housing in the opposite direction of the cam's rotation. Observe the test lamp: the moment it illuminates indicates that the points are beginning to open, thereby generating high voltage in the secondary winding and producing a spark. This precise position is where the distributor housing must be secured for final adjustment.