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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1497 (Engine Mechanical - 4.2L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Exhaust Camshaft Position Actuator Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the exhaust camshaft actuator into the timing chain.
  2. Align the marked link of the timing chain with the timing mark on the exhaust camshaft position actuator sprocket (1).
    IMPORTANT: Ensure the alignment pin is engaged between the camshaft and the exhaust camshaft position actuator.
  3. Install the exhaust camshaft actuator onto the exhaust camshaft.
    Fig 1: Installing Exhaust Camshaft Actuator
    G02128551Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Insure the camshaft actuator is rotated clockwise relative to the camshaft prior to tightening the bolt. Do not force the camshaft actuator to rotate clockwise. If it doesn't move easily, it is already fully advanced. New camshaft actuators are already packaged in the fully advanced (clockwise) position.
  4. Use the 25 mm (1 in) hex between the cam lobes to rotate the exhaust camshaft counter-clockwise until it stops (as seen from the front of the vehicle), this will place the camshaft actuator in the fully advanced (clockwise) position.
    NOTE: The camshaft actuator must be fully advanced during installation. Engine damage may occur if the camshaft actuator is not fully advanced.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  5. Install the exhaust camshaft actuator bolt.

    Tighten 

    • Tighten the exhaust camshaft actuator bolt the first pass to 25 N.m (18 lb ft).
    • Use the J 36660-A  to tighten the exhaust camshaft actuator bolt the final pass an additional 135 degrees.
      Fig 2: Rotating Exhaust Camshaft Counter-Clockwise Until It Stops
      G02128552Courtesy of GENERAL MOTORS CORP.
  6. Remove the J-44217  .
  7. Install the top chain guide.
  8. Add threadlock GM P/N 12345493 (Canadian P/N 10953488) to the top chain guide bolt threads.
  9. Install the top chain guide bolts.

    Tighten 

    Tighten the top chain guide bolts to 10 N.m (89 lb in).

  10. Install the camshaft cover. Refer to CAMSHAFT COVER REPLACEMENT   .
    Fig 3: Installing Top Chain Guide
    G02128553Courtesy of GENERAL MOTORS CORP.
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