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Home >> GMC >> 1985 >> Forward Control 4.8 T, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Carburetor - ROCHESTER M4M Series 4-Bbl >> Adjustments >> Air Valve Spring

Air Valve Spring

    NOTE: Tighten adjusting screw specified number of turns.
  1. Using a 3/32" Allen wrench, loosen lock screw. Turn tension adjusting screw counterclockwise until air valve opens part way. See Fig 1.
  2. Turn tension adjusting screw clockwise until air valve just closes. Then turn adjusting screw clockwise specified number of turns. Hold adjusting screw and tighten lock screw.
Fig 1: Air Valve Spring Adjustment
G8698
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