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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Mechanical - 3.6L (Ly7) (Repair Procedures -- 3 Of 5)) >> Off-Vehicle Repair Instructions - Part 2 >> Camshaft Cleaning and Inspection >> Camshaft Measurement

Camshaft Measurement

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying Camshaft In A Suitable Fixture
    GM1210914Courtesy of GENERAL MOTORS CORP.
  1. With the camshaft in a suitable fixture, measure the camshaft for wear.
    2. Fig 2: 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 .
    • If the diameter is smaller than specifications, replace the camshaft.
    • If the out-of-round exceeds specifications, replace the camshaft.
    3. Fig 3: Measuring Camshaft Runout
    GM1210917Courtesy of GENERAL MOTORS CORP.
  3. Measure the camshaft runout using the J 7872  . Refer to Engine Mechanical Specifications .
    4. Fig 4: Measuring Camshaft Thrust Width
    GM1210918Courtesy of GENERAL MOTORS CORP.
  4. Measure the camshaft thrust width for wear using a depth micrometer. Refer to Engine Mechanical Specifications .
    5. Fig 5: Measuring Camshaft Thrust Wall Surface
    GM1210919Courtesy of GENERAL MOTORS CORP.
  5. Measure the camshaft thrust wall surface for runout using J 7872  . Refer to Engine Mechanical Specifications .
  6. If the camshaft is damaged or worn beyond specifications, replace the camshaft. No machining of the camshaft is allowed.
    7. Fig 6: Measuring Camshaft Lobes
    GM1210920Courtesy of GENERAL MOTORS CORP.
  7. Measure the camshaft lobes for wear using the J 7872  .
    8. Fig 7: Identifying Camshaft Lobe
    GM1539015Courtesy of GENERAL MOTORS CORP.
  8. Place the J 7872  with the indicator tip on the base circle (1) of the camshaft lobe.
    1. Place the J 7872  at zero.
    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 .
    3. If the indicated measurement is significantly lower than these specifications, replace the camshaft or engine performance will be reduced.
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