Camshaft and Bearings Cleaning and Inspection


    Object Number: 1272851  Size: SH
  1. Clean the components in solvent.

    Caution

    Wear safety glasses in order to avoid eye damage.

  2. Dry the components with compressed air.
  3. Inspect the camshaft bearing journals (1) for scoring or excessive wear.
  4. Inspect the camshaft valve lifter lobes (2) for scoring or excessive wear.
  5. Inspect the threaded bolt holes (3) in the front of the camshaft for damaged threads or debris.
  6. Inspect the camshaft sprocket pin (204) for damage.
  7. Inspect the camshaft position reluctor ring for nicks or damage.
    Object Number: 63211  Size: SH
  8. Inspect the camshaft retainer plate for wear or a damaged sealing gasket. If the camshaft retainer plate sealing gasket is not cut or damaged, it may be used again.
    Object Number: 63163  Size: SH
  9. Inspect the camshaft bearings for proper fit in the engine block. The camshaft bearings have an interference fit to the engine block and should not be loose in their engine block bearing bores.
  10. Inspect the camshaft bearings for excessive wear or scoring. Bearings with excessive scoring or wear must be replaced.
    Object Number: 35212  Size: SH
  11. Measure the camshaft journals for wear and out-of-round with a micrometer.
    Object Number: 260130  Size: SH
  12. Measure the camshaft lobes for wear with a micrometer.
    Object Number: 64297  Size: SH
  13. Measure the camshaft runout.
    1. Mount the camshaft in wooden V-blocks or between centers on a fixture.
    2. Check the runout of the intermediate camshaft bearing journals using the J 7872 .
    3. If camshaft runout exceeds 0.05 mm (0.002 in), the camshaft is bent and should be replaced.
Measuring Camshaft Lobe Lift

    Object Number: 64967  Size: MH

    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 .
    1. Remove the valve rocker arms and bolts
    2. Install the dial indicator mounting stud into the valve rocker arm bolt hole.
    3. Assemble the components of the J 8520 and position onto the stud.
    4. Position the shaft of the dial indicator onto the end of the pushrod.
    5. Rotate the face of the dial indicator to zero.
    6. Slowly rotate the crankshaft clockwise until the dial indicator obtains its highest and lowest readings.
    7. Compare the total lift shown to specifications.
    8. Remove the tool.
  2. Compare measurements to specifications. If the readings are not within specifications, remove the camshaft. Inspect and/or replace components as required.