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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1619 (Engine Mechanical - 4.8L, 5.3L & 6.0L) >> 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 Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. 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
    G02106666Courtesy 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
    G02106667Courtesy 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 & Bolts
    G02106668Courtesy 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.

    Fig 4: Positioning Crankshaft Sprocket Key
    G02106669Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  7. With the engine in the number one firing position, tighten the following valve rocker arm bolts:

    Tighten 

    • Tighten the cylinders 1, 2, 7 and 8 exhaust valve rocker arm bolts to 30 N.m (22 lb ft).
    • Tighten the cylinders 1, 3, 4 and 5 intake valve rocker arm bolts to 30 N.m (22 lb ft).
  8. Rotate the crankshaft 360 degrees.
  9. Tighten the following valve rocker arm bolts:

    Tighten 

    • Tighten the cylinders 3, 4, 5 and 6 exhaust valve rocker arm bolts to 30 N.m (22 lb ft).
    • Tighten the 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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