LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1819 (Engine Mechanical - 3.5L (L66)) >> Repair Instructions >> Off Vehicle Repair Instructions >> Camshafts Cleaning and Inspection >> Camshaft Inspection

Camshaft Inspection

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Measuring Camshaft
    GM897293Courtesy of GENERAL MOTORS CORP.
  1. Clean the camshaft and inspect for pitted, scored or excessively worn lobes.
  2. Measure the diameter of each bearing journal.
    3. Fig 2: Exploded View Of Intake Valve Rocker Arms
    GM897120Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: In order to properly measure the camshaft journal bores, the rocker arm shafts must be bolted to the cylinder heads.
  3. Remove the rocker arms (215, 218) and springs (219) from the shafts (220, 221).
  4. Lubricate the bolt threads and flanges with clean engine oil.
  5. Install the rocker arm shafts and bolts to the cylinder heads.
    6. Fig 3: View Of Cylinder Head Rocker Shaft Bolts
    GM897290Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  6. Tighten the left cylinder head rocker shaft bolts in sequence.

    Tighten: 

    1. Tighten the bolts a first pass to 12 N.m (106 lb in).
    2. Tighten the bolts a final pass to 24 N.m (17 lb ft).

    7. Fig 4: Right Cylinder Head Rocker Shaft Bolt Tightening Sequence
    GM1308159Courtesy of GENERAL MOTORS CORP.
  7. Tighten the right cylinder head rocker shaft bolts in sequence.

    Tighten: 

    1. Tighten the bolts a first pass to 12 N.m (106 lb in).
    2. Tighten the bolts a final pass to 24 N.m (17 lb ft).

    8. Fig 5: Measuring The Inside Diameter (I.D.) Of Camshaft Bearing Surface
    GM897295Courtesy of GENERAL MOTORS CORP.
  8. Clean the bearing surfaces in the cylinder head and measure the inside diameter (ID) of each camshaft bearing surface. Also, inspect for an out-of-round condition.
  9. Calculate the camshaft-to-journal clearance.

    Specification: 

    • Camshaft-to-journal clearance - new: 0.05-0.2 mm (0.002-0.008 in)
    • Camshaft-to-journal clearance - service limit: 0.2 mm (0.008 in)

    10. Fig 6: Measuring Camshaft Run Out
    GM897298Courtesy of GENERAL MOTORS CORP.
  10. Install the camshaft into V-blocks and use the J 7872  to measure the runout.

    Specification: 

    • Camshaft total runout - new: 0.03 mm (0.001 in)
    • Camshaft total runout - service limit: 0.04 mm (0.002 in)

    11. Fig 7: Identifying & Measuring Camshaft Lobes
    GM897300Courtesy of GENERAL MOTORS CORP.
  11. Identify the camshaft lobes.
    • Exhaust (1)
    • Intake primary - right cylinder head (2)
    • Intake mid (3)
    • Intake secondary - right cylinder head (4)
    • Intake secondary - left cylinder head (5)
    • Intake primary - left cylinder head (6)
  12. Measure the camshaft lobe height. If the measurement is less than the specification, replace the camshaft.

    Specification: 

    • Intake primary lobe height: 35.041 mm (1.3796 in)
    • Intake mid lobe height: 36.445 mm (1.4348 in)
    • Intake secondary lobe height: 35.284 mm (1.3891 in)
    • Exhaust lobe height: 36.326 mm (1.4302 in)

scientia non olet · About LEMON Manuals