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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1019 (Engine Mechanical - 4.8L, 5.3L & 6.0L (Repair Instructions - 1 Of 3)) >> Repair Instructions (On-Vehicle & Off-Vehicle - Part 1) >> On-Vehicle Repair Instructions >> Valve Rocker Arm and Push Rod Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 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.
    4. Fig 1: View Of Valve Rocker Arm Pivot Support
    GM260141Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Make sure that the pushrods seat properly to the valve lifter sockets.
  4. Install the pushrods.
    5. Fig 2: View Of Pushrods
    GM260142Courtesy 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.
    6. Fig 3: View Of Valve Rocker Arms & Bolts
    GM832221Courtesy 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. Fig 4: View of Crankshaft/Camshaft In Position For Number 1 Piston At TDC
    GM661566Courtesy of GENERAL MOTORS CORP.
  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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