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4.9L Valve Clearance Adjustment

NOTE: Hydraulic valve lifters are used; no valve adjustment is required. If valve clearance is incorrect, use oversize or undersize push rods to correct clearance.
  1. Position crankshaft so No. 1 piston is at TDC on compression stroke. Make chalk mark on vibration damper 120 degrees from timing mark. Make second chalk mark 120 degrees from first mark. This will divide the damper into 3 equal parts to facilitate checking valve clearance on all cylinders.
  2. Ensure rocker arm bolts on cylinder No. 1 are tightened to 17-23 ft. lbs. (23-31 N.m). Using Lifter Bleed Down Wrench (T70P-6513-A), slowly apply pressure to bleed down lifter until plunger is completely bottomed.
  3. Measure clearance between rocker arm and valve stem. See 4.9L COLLAPSED VALVE LIFTER CLEARANCE table. If clearance is not within specification, install longer or shorter push rod to obtain correct clearance.
  4. Rotate engine to next mark on vibration damper. Repeat procedure on each succeeding cylinder in firing order (1-5-3-6-2-4), rotating engine to next mark on damper before checking clearance.
4.9L COLLAPSED VALVE LIFTER CLEARANCE

Application In. (mm)
Allowable .100-.200 (2.54-5.10)
Desired .125-.175 (3.18-4.45)
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