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ENGINE DIVISION SERVICE MANUAL
TM 5-4210-230-14&P-1
Erratic timing advance
Vacuum leaks in vacuum
Check vacuum hoses. Replace
advance system.
as needed.
Faulty vacuum advance
Check operation of advance
diaphragm assembly.
diaphragm. Replace if
needed.
Sticking or worn sensor
Replace electronic control
plate.
unit.
Misadjusted, damaged or
Readjust spring tension. Re-
weak mechanical advance
place distributor shaft as-
springs.
sembly.
Mechanical advance fly-
Replace distributor shaft
weight bushings worn.
assembly.
Trigger wheel assembly
Free-up and lubricate trig-
binding or excessively
ger wheel assembly. Replace
loose or distributor
distributor shaft assembly,
shaft.
if needed.
CGES-145-U Page 30
PRINTED IN UNITED STATES OF AMERICA
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