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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1496 (Engine Mechanical - 5.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Camshaft Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: If camshaft replacement is required, the valve lifters must also be replaced.
  1. Lubricate the camshaft journals and the bearings with clean engine oil.
  2. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts to the bolt holes in the front of the camshaft.
    NOTE: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.
  3. Using the bolts as a handle, carefully install the camshaft into the engine block.
  4. Remove the three bolts from the front of the camshaft.
    IMPORTANT: Install the retainer plate with the sealing gasket facing the engine block.

    The gasket surface on the engine block should be clean and free of dirt and/or debris.

    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  5. Install the camshaft retainer and bolts.

    Tighten 

    Tighten the bolts to 25 N.m (18 lb ft).

    Fig 1: Installing Camshaft Retainer And Bolts
    G02129269Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Properly locate the camshaft sprocket locating pin with the camshaft sprocket alignment hole.
    • The sprocket teeth and timing chain must mesh.
    • The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly. Locate the camshaft sprocket alignment mark in the 6 o'clock position.
  6. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
    Fig 2: Aligning Camshaft & Crankshaft Sprockets
    G02129270Courtesy of GENERAL MOTORS CORP.
  7. Install the camshaft sprocket and the timing chain.
  8. Install the camshaft sprocket bolts.

    Tighten 

    Tighten the bolts to 35 N.m (26 lb ft).

    Fig 3: Installing Camshaft Sprocket And Timing Chain
    G02129271Courtesy of GENERAL MOTORS CORP.
  9. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused.
  10. Lubricate the O-ring seal with clean engine oil.
  11. Install the camshaft sensor and bolt.

    Tighten 

    Tighten the bolt to 25 N.m (18 lb ft).

  12. Install the valve lifters. Refer to VALVE LIFTER REPLACEMENT   .
  13. Install the condenser. Refer to CONDENSER REPLACEMENT  in Heating, Ventilation and Air Conditioning.
    Fig 4: Installing Camshaft Sensor And Bolt
    G02129272Courtesy of GENERAL MOTORS CORP.
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