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Home >> Chevrolet >> 2015 >> Camaro LS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Mechanical - 6.2L (L99 LS3 LSA) Or 7.0L (LS7) - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Camshaft and Bearings Cleaning and Inspection (without variable valve timing) >> Camshaft and Bearings Cleaning and Inspection

Camshaft and Bearings Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying Camshaft Inspection Areas
    GM1658202Courtesy of GENERAL MOTORS COMPANY
  1. Clean the components in solvent.
    2. WARNING:

    Refer to Safety Glasses Warning .

  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 hole (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 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.

    8. Fig 2: Measure Camshaft Journals With Micrometer
    GM35212Courtesy of GENERAL MOTORS COMPANY
  8. Using a micrometer, measure the camshaft journals for wear and out-of-round. Refer to Engine Mechanical Specifications (L99)Engine Mechanical Specifications (LS3)Engine Mechanical Specifications (LSA)Engine Mechanical Specifications (LS7) .
    • If the camshaft bearing journals are out-of-round, replace the camshaft.
    • If the camshaft bearing journal diameter is not within specification, replace the camshaft.
    9. Fig 3: Measuring Camshaft Lobes
    GM1658205Courtesy of GENERAL MOTORS COMPANY
  9. Using a micrometer, measure the camshaft lobes for wear. Refer to Engine Mechanical Specifications (L99)Engine Mechanical Specifications (LS3)Engine Mechanical Specifications (LSA)Engine Mechanical Specifications (LS7) .
    10. Fig 4: Measuring Camshaft Runout
    GM64297Courtesy of GENERAL MOTORS COMPANY
  10. Measure the camshaft runout.
    1. Mount the camshaft in wooden V-blocks or between centers on a fixture.
    2. Using the J 7872  indicator , measure the runout of the intermediate camshaft bearing journals.
    3. If camshaft runout is not within specification, the camshaft is bent and should be replaced. Refer to Engine Mechanical Specifications (L99)Engine Mechanical Specifications (LS3)Engine Mechanical Specifications (LSA)Engine Mechanical Specifications (LS7) .
    11. Fig 5: Camshaft Bearings
    GM1552451Courtesy of GENERAL MOTORS COMPANY
  11. Inspect the camshaft bearings for the following conditions:
    • Excessive wear, evidence of galling, pitting, scoring, or embedded debris. The appearance of the bearing material being different shades of gray are considered normal, and are not a guideline for bearing replacement. Measure the bearing inside diameter (ID) as required for an over-sized condition. Refer to Engine Mechanical Specifications (L99)Engine Mechanical Specifications (LS3)Engine Mechanical Specifications (LSA)Engine Mechanical Specifications (LS7) .
    • Proper fit in the engine block. Camshaft bearings have an interference fit to the engine block and should not be loose in the engine block bearing bores.
    • The oil lubrication feed hole in the bearing must be in alignment with the drilled oil passage in the block.
    • The oil lubrication feed hole is not plugged by debris.
    • Bearings with excessive wear, galling, pitting, scoring, or embedded debris must be replaced.
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