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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 400/M40 >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 4.1L 6-CYL - VIN [D] >> Adjustments >> Valve Clearance Adjustment >> Valve Arrangement

Valve Arrangement

E-I-I-E-E-I-I-E-E-I-I-E (Front to rear)

  1. Remove distributor cap. Mark distributor housing at No. 1 and No. 6 rotor firing positions.
  2. With distributor rotor in the positions designated in Valve Adjustment table, adjust valves as follows: Loosen rocker arm adjusting nut until push rod lash (play) is felt. Tighten adjusting nut until all lash is removed. When lash has been removed, tighten adjusting nut 1 full turn to complete procedure.
VALVE CLEARANCE ADJUSTMENT

Rotor Position Adjust Int. Nos. Adjust Exh. Nos.
No. 1 1, 2, 4 1, 3, 5
No. 6 3, 5, 6 2, 4, 6
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