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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 >> Valve Rocker Arm and Push Rod 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: When reusing the valve train components, always install the components to the original location and position.

Valve lash is net build, no valve adjustment is required.

  1. Lubricate the valve rocker arms and pushrods with clean engine oil.
  2. Lubricate the flange of the valve rocker arm bolts with clean engine oil. Lubricate the flange or washer surface of the bolt that will contact the valve rocker arm.
  3. Install the valve rocker arm pivot support.
    Fig 1: Installing Valve Rocker Arm Pivot Support
    G02129140Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Make sure that the pushrods seat properly to the valve lifter sockets.
  4. Install the pushrods.
    Fig 2: Installing Pushrods
    G02129141Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Make sure that the pushrods seat properly to the ends of the rocker arms. DO NOT tighten the rocker arm bolts at this time.
  5. Install the rocker arms and bolts.
    Fig 3: Installing Rocker Arms And Bolts
    G02129142Courtesy of GENERAL MOTORS CORP.
  6. Rotate the crankshaft until the number one piston is at top dead center (TDC) of the compression stroke.

    In this position, cylinder number one rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position.

    The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3.

    Cylinders 1, 3, 5 and 7 are the left bank.

    Cylinder 2, 4, 6 and 8 are the right bank.

    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  7. With the engine in the number one firing position, tighten the following valve rocker arm bolts:

    Tighten 

    • Tighten cylinders 1, 2, 7 and 8 exhaust valve rocker arm bolts to 30 N.m (22 lb ft).
    • Tighten cylinders 1, 3, 4 and 5 intake valve rocker arm bolts to 30 N.m (22 lb ft).
      Fig 4: Identifying Crank Shaft Sprocket Key Position On TDC
      G02129143Courtesy of GENERAL MOTORS CORP.
  8. Rotate the crankshaft 360 degrees.
  9. Tighten the following valve rocker arm bolts:

    Tighten 

    • Tighten cylinders 3, 4, 5 and 6 exhaust valve rocker arm bolts to 30 N.m (22 lb ft).
    • Tighten cylinders 2, 6, 7 and 8 intake valve rocker arm bolts to 30 N.m (22 lb ft).
  10. Install the valve rocker arm cover. Refer to VALVE ROCKER ARM COVER REPLACEMENT - LEFT   or VALVE ROCKER ARM COVER REPLACEMENT - RIGHT   .
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