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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 164 (Engine Mechanical - 4.6L - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Camshaft Cleaning and Inspection >> Camshaft Measurement Procedure

Camshaft Measurement Procedure

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Supporting Camshaft
    GM593956Courtesy of GENERAL MOTORS COMPANY
  1. With the camshaft in a suitable fixture, measure the camshaft for wear.
    2. Fig 2: Measure Camshaft Journals With Micrometer
    GM35212Courtesy of GENERAL MOTORS COMPANY
  2. Measure the camshaft journals for diameter and out-of-round using an outside micrometer.
    • If the diameter is smaller than 26.948 mm (1.061 in), replace the camshaft.
    • If the out-of-round exceeds 0.022 mm (0.0009 in), replace the camshaft.
    3. Fig 3: Measuring Camshaft Runout
    GM593961Courtesy of GENERAL MOTORS COMPANY
  3. Measure the camshaft runout using J 7872  indicator. Refer to Engine Mechanical Specifications (LD8) , Engine Mechanical Specifications (L37) .
    4. Fig 4: Measuring Camshaft Thrust Wall Width & Surface Runout
    GM593962Courtesy of GENERAL MOTORS COMPANY
  4. Measure the camshaft thrust wall width (1) for wear using an inside micrometer. Refer to Engine Mechanical Specifications (LD8) , Engine Mechanical Specifications (L37) .
  5. Measure the camshaft thrust wall surface (2) for runout using J 7872  indicator. Refer to Engine Mechanical Specifications (LD8) , Engine Mechanical Specifications (L37) .
  6. If the camshaft is damaged or worn beyond specifications, replace the camshaft. No machining of the camshaft is allowed.
    7. Fig 5: Measuring Camshaft Lobes For Wear
    GM593965Courtesy of GENERAL MOTORS COMPANY
  7. Measure the camshaft lobes for wear using the J 7872  indicator.
    8. Fig 6: Identifying Base Circle
    GM71392Courtesy of GENERAL MOTORS COMPANY
  8. Place the J 7872  indicator with the indicator tip on the base circle (2) of the camshaft lobe.
    1. Place the J 7872  indicator dial at zero.
    2. Rotate the camshaft until the indicator tip is at the highest point on the lobe. This reading is the lift (1) of the camshaft lobe.
    3. The specifications for lift are as follows:
      • Intake camshaft: 6.154 mm (0.2423 in)
      • Exhaust camshaft: 5.944 mm (0.2336 in)
  9. If the indicated measurement is significantly lower than these specifications, replace the camshaft or engine performance will be reduced.
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