Centrifugal Advance

Centrifugal Advance:

1. Set the parking brake. Shift automatic transmission to PARK and manual transissions to NEUTRAL.
2. START the engine and allow it to attain normal operating temperature. Ensure that the A/C is turned OFF, if equipped.
3. With the ignition switch OFF, disconnect the three-wire connector from the 4 in. and 10 in. vacuum switch assembly.
4. Disconnect and plug the vacuum hose connected to the distributor vacuum advance mechanism.
5. Connect a timing light on the No. 1 spark plug wire.
6. Connect an expanded scale tachometer to the coil negative terminal.
7. START engine and slowly increase the speed while observing the timing mark and index with the timing light.
8. The ignition timing should advance smoothly as engine speed increases.
9. If ignition timing advances unevenly, check and repair the centrifugal advance mechanism.
10. Connect the distributor vacuum advance hose and vacuum switch assembly three-wire connector.
11. Remove the timing light and tachometer.