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Home >> Jeep >> 1969 >> Commando 3.7L Eng >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition Distributors - PRESTOLITE >> Adjustment >> Vacuum Advance
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Vacuum Advance

NOTE: Vacuum advance units on 6 Cyl. distributors cannot be adjusted.

To adjust vacuum advance, remove the retaining plug and the gasket and remove washers. Check thickness of removed washers and substitute thinner washer if vacuum required to move plate is greater than specified. Substitute thicker washer if vacuum required to move plate is less than specified.

NOTE: It may be necessary to replace spring, then adjust to specifications by means of various combinations of washers.
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