TM 10-3930-653-14&P Condition Location Probable cause Corrective action Engine knocks Distributor Improper and advance timing. Correct. very often. Coming off or breakage of governor spring. Correct or replace. Governor portion worn out. Replace. Spark plugs. Burnt too much. Replace. Engine does not Distributor Improper and retarded timing. Correct. give enough power. Faulty function of governor. Replace assembly. Dirty points. Clean. Point gap too narrow. Correct. Spark plugs Dirty. Clean. 4-92

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