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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1162 (Engine Mechanical - 3.6L (4 Of 6)) >> Off-Vehicle Repair Instructions (2 Of 4) >> Camshaft Cleaning and Inspection >> Camshaft Measurement

Camshaft Measurement

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View of Support Camshaft In Fixture
    GM1210914Courtesy of GENERAL MOTORS CORP.
  1. With the camshaft in a suitable fixture, measure the camshaft for wear.
    2. Fig 2: View of Measuring Camshaft Journals
    GM1210916Courtesy of GENERAL MOTORS CORP.
  2. Measure the camshaft journals for diameter and out-of-round using an outside micrometer. Refer to Engine Mechanical Specifications (LY7) or Engine Mechanical Specifications (LLT) .
    • If the diameter is smaller than specifications, replace the camshaft.
    • If the out-of-round exceeds specifications, replace the camshaft.
    3. Fig 3: View of Camshaft Runout Check With J 7872
    GM1210917Courtesy of GENERAL MOTORS CORP.
  3. Measure the camshaft runout using the J 7872  . See Special Tools . Refer to Engine Mechanical Specifications (LY7) or Engine Mechanical Specifications (LLT) .
    4. Fig 4: View of Measure Camshaft Thrust
    GM1210918Courtesy of GENERAL MOTORS CORP.
  4. Measure the camshaft thrust width for wear using a depth micrometer. Refer to Engine Mechanical Specifications (LY7) or Engine Mechanical Specifications (LLT) .
    5. Fig 5: Identifying J 7872
    GM1210919Courtesy of GENERAL MOTORS CORP.
  5. Measure the camshaft thrust wall surface for runout using J 7872  . See Special Tools . Refer to Engine Mechanical Specifications (LY7) or Engine Mechanical Specifications (LLT) .
  6. If the camshaft is damaged or worn beyond specifications, replace the camshaft. No machining of the camshaft is allowed.
    7. Fig 6: View of Tool J7872 Measuring Camshaft Lobes For Wear
    GM1210920Courtesy of GENERAL MOTORS CORP.
  7. Measure the camshaft lobes for wear using the J 7872  . See Special Tools .
    8. Fig 7: View of Lobe Diagram
    GM1990094Courtesy of GENERAL MOTORS CORP.
  8. Place the J 7872  with the indicator tip on the base circle (1) of the camshaft lobe. See Special Tools .
    1. Place the J 7872  at zero. See Special Tools .
    2. Rotate the camshaft until the indicator tip is at the highest point (3) on the lobe. This reading is the lift of the camshaft lobe. Refer to Engine Mechanical Specifications (LY7) or Engine Mechanical Specifications (LLT) .
    3. If the indicated measurement is significantly lower than these specifications, replace the camshaft or engine performance will be reduced.
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