Vanagon F4-1915cc 1.9L (Water Cooled) (1983)
Distributor Advance Unit: Testing and Inspection
Checking Centrifugal Advance
With TDC Tester
Ignition distributor, checking centrifugal advance with TDC sensor
CAUTION: Ignition must he switched OFF before connecting tester.
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Connect tester according to manufacturer's instructions.
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Connect positive lead to alternator or connection box.
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Pull both hoses off distributor vacuum unit.
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Disconnect plugs from idle stabilizer and connect together.
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Start engine and adjust idle speed to 900 RPM.
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Note basic advance angle shown on tester.
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Increase engine speed slowly. centrifugal advance is indicated by an increase in the number of degrees.
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Increase engine speed to next test speed.
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Read advance angle on tester.
Note: To determine centrifugal advance, subtract basic advance angle from last advance angle measured.
Example last advance angle measured (-) minus basic advance angle (=) centrifugal advance
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Compare centrifugal advance angle. to specified value on specification chart
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Repeat test at other test speeds.
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Reconnect vacuum hoses when completed testing.
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Adjust idle speed.
With Timing Light
Ignition distributor, checking centrifugal advance with timing light
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Connect tester according to manufacturer's instructions.
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Pull both hoses off distributor vacuum unit.
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Disconnect plugs from idle stabilizer and connect together.
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Start engine and adjust idle speed to 900 RPM.
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Shine timing light on timing mark and note indicated angle (basic angle)
Note: Start of centrifugal advance is shown by movement of notch while increasing RPM.
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Increase engine speed slowly to 1600 RPM.
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Bring back notch to original setting by turning knob on tester. Read off advance value.
Note: To determine centrifugal advance, subtract basic advance angle from last advance angle measured.
Example: last advance angle measured (-) minus basic advance angle