Distributor cap. Distributor rotor

Distributor cap

Remove the distributor cap and wipe it clean with a dry lint free cloth. Visually inspect the cap for cracks, carbon paths, broken towers or damaged rotor button (Fig. 9) or (Fig. 10). Also check for white deposits on the inside (caused by condensation entering  entering the cap through cracks). Replace any cap that displays charred or eroded terminals. The machined surface of a terminal end (faces toward rotor) will indicate some evidence of erosion from normal operation.

Examine the terminal ends for evidence of mechanical interference with the rotor tip.

Fig. 9 Cap Inspection-External-Typical

1 - BROKEN TOWER

2 - DISTRIBUTOR CAP

3 - CARBON PATH

4 - CRACK

Fig. 10 Cap Inspection-Internal-Typical

1 - CHARRED OR ERODED TERMINALS

2 - WORN OR DAMAGED ROTOR BUTTON

3 - CARBON PATH

Distributor rotor

Visually inspect the rotor (Fig. 11) for cracks, evidence of corrosion or the effects of arcing on the metal tip. Also check for evidence of mechanical interference with the cap. Some charring is normal on the end of the metal tip. The silicone-dielectricvarnish- compound applied to the rotor tip for radio interference noise suppression, will appear charred.

This is normal. Do not remove the charred compound.

Test the spring for insufficient tension.

Replace a rotor that displays any of these adverse conditions.

Fig. 11 Rotor Inspection-Typical

1 - INSUFFICIENT SPRING TENSION

2 - CRACKS

3 - EVIDENCE OF PHYSICAL CONTACT WITH CAP

4 - ROTOR TIP CORRODED