Lighting Equipment

DISTRIBUTOR

The distributor is basically a high speed switch which delivers high voltage to each spark plug at exactly the right time to fire the fuel air mixture in the combustion chamber. Any time there is any variation in the delivery of this high voltage, it will result in a rough running engine, lack of power and poor fuel economy.

Figure 68

The distributor is mounted on the left hand side of the engine and is gear driven from the camshaft in a clockwise rotation. Automatic spark advance is built into the distributor and will advance the spark as the engine RPM is increased. The firing order is 1-3-4:...2.

The ease of starting, fuel consumption, and the general engine performance are all dependent upon correct distributor ignition timing, and the correct adjustment of the distributor points.

After each 500 hours of operation, inspect the distributor points for wear and adjustment.

79

Adjusting the Distributor Points

1. Remove the distributor cap, pull the rotor from the shaft and remove the dust shield. 2. Remove any roughness from the surfaces of the points with a small file or hone before checking the point gap with a feeler gauge. This roughness is caused by a normal transfer of metal from one point to the other due to the passage of electrical current across the points. 3. Crank the engine over slowly until the block on the movable dis- · tributor point is in contact with the peak of the lobe on the distributor cam, Figure 69.

Figure 69

4. Check the distance between the two distributor points with a feeler gauge; the correct point gap is .020 inch. To increase point gap, loosen the lockscrew,insert screwdriver in the adjusting slot and move stationary point away from the movable point. To decrease point gap. Loosen the lockscrew, insert screwdriver in the adjusting slot and move the stationary point toward the movable point. 5. When the correct point gap of .020 inch is obtained, tighten the lockscrew, then replace the dust shield, rotor and distributor cap MOTi The distributor rotor and cam drive are designed so the rotor can only be installed in one position.