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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1619 (Engine Mechanical - 4.8L, 5.3L & 6.0L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Camshaft and Bearings Cleaning and Inspection >> Measuring Camshaft Lobe Lift

Measuring Camshaft Lobe Lift

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IMPORTANT: Measuring camshaft lobe lift is a procedure used to determine if the camshaft lobes have worn. This test is to be performed prior to engine disassembly and with the camshaft and valve train components installed in the engine.
  1. Measure camshaft lobe lift using J 8520  .
  2. Remove the valve rocker arms and bolts
  3. Install the dial indicator mounting stud into the valve rocker arm bolt hole.
  4. Assemble the components of the J 8520  and position onto the stud.
  5. Position the shaft of the dial indicator onto the end of the pushrod.
    Fig 1: J 8520 & J 8520-10
    G02107063Courtesy of GENERAL MOTORS CORP.
  6. Rotate the face of the dial indicator to zero.
  7. Slowly rotate the crankshaft clockwise until the dial indicator obtains its highest and lowest readings.
  8. Compare the total lift shown to specifications:
    • The proper lobe lift for 4.8/5.3L intake lobes is 6.82 mm (0.268 in).
    • The proper lobe lift for 4.8/5.3L exhaust lobes is 6.96 mm (0.274 in).
    • The proper lobe lift for 6.0L intake lobes is 6.96 mm (0.274 in).
    • The proper lobe lift for 6.0L exhaust lobes is 7.13 mm (0.281 in).
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