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BB in vacuum timing advance line? 140-160 1972

posted by  someone claiming to be cameron on  Thu Feb 19 05:50 CST 2004 [RELATED]

Vacuum advance distributors are very rare on B20s - it's much more likely that it's a vacuum retard.

Removing the thermostat may not tell you whether coolant is being circulated -- feeling the top hose, or the top of the radiator can. If it's hot, the thermostat has opened; if it stays cool, the tstat probably hasn't.

Best thing to do: set the timing according to the procedure in the Haynes (note that it says 'vacuum regulator disconnected'). You might find that it runs better with the vacuum unit disabled, as you found it; and you might find that it runs better with the unit connected.

Very likely vacuum retard.

Best,

Cameron
Rose City






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