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Home >> Ford >> 1990 >> Bronco II RWD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Valve Clearance Check >> 4.9L Engine
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4.9L Engine

  1. Turn crankshaft damper so that No. 1 piston is at TDC on compression stroke. Make 2 chalk marks on crankshaft damper. The first, 120 degrees from timing mark. The second, 120 degrees from first chalk mark. Crankshaft damper will be divided into 3 equal parts. Tighten rocker arm bolts of No. 1 intake and exhaust valves to 17-23 ft. lb. (23-31 N.m).
  2. Using Lifter Bleed Down Wrench (T70P-6513-A), slowly apply pressure to bleed down lifter until the plunger is completely bottomed. Check clearance between rocker arm and valve stem. Should be .10-.20" (2.5-5 mm). If clearance is less than specification, install a shorter push rod.
  3. If clearance is more than specification, install a longer push rod. Repeat this procedure for the remaining valves. Adjust remaining valves in firing order sequence. With No. 1 piston on TDC, check/adjust the following valves:
    • No. 1 Intake and Exhaust.
    • No. 6 Intake and Exhaust.

Rotate crankshaft in direction of engine rotation to align first chalk mark with TDC on timing marker. Check/adjust the following valves:

Rotate crankshaft in direction of engine rotation to align second chalk mark with TDC on timing marker. Check/adjust the following valves:

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