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Home >> Mercury >> 1965 >> Caliente 4.7L Eng VIN D >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 221", 260", 289" V8 Engines >> Engine Notes >> Mechanical Lifter Initial Adjustment After Overhaul

Mechanical Lifter Initial Adjustment After Overhaul

(289" Engine) 

Tappet Clearance (Cold) listed in table below. For hot clearance (after engine operated for 30 minutes at 1200 RPM) see Tune-Up Data. 

  1. Place No. 1 piston at TDC of compression stroke. Adjust following valve clearances: No. 1, 7, 8 Intake; No. 1, 4, 5 Exhaust.
  2. Turn crankshaft 1/2-turn or 180° (No. 4 piston at TDC). Adjust following valve clearances: No. 4 & 5 Intake; No. 2 & 6 Exhaust.
  3. Turn crankshaft 3/4-turn or 270° from second position above (No. 3 piston at TDG) and adjust following valve clearances: No. 2, 3, 6 Intake; No. 3, 7, 8 Exhaust.
    Valve Tappet Clearance (Cold)

    289" Engine (1963) .024" Int. & Exh.
      (1964-67) .022" Int. & Exh.

ROCKER ARM ADJUSTING SCREW NOTE  - if torque required to turn self-locking adjusting screw is less than 3 ft. lbs., install new standard or.0023" oversize screw, If minimum 7 ft, lbs. torque cannot be obtained with oversize adjusting screw, replace rocker arm and adjusting screw assembly.

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