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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1018 (Engine Mechanical - 4.3L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Valve Rocker Arm and Push Rod Installation

Valve Rocker Arm and Push Rod Installation

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Be sure to keep parts in order. Parts must be reinstalled into the original location and position.
  1. Install the valve pushrods.
    2. Fig 1: View Of Valve Pushrods
    GM480529Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Be sure that the arrow on the valve rocker arm support is in the up position.
  2. Install the valve rocker arm supports.
    3. Fig 2: Installing Valve Rocker Arm Supports
    GM480578Courtesy of GENERAL MOTORS CORP.
  3. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent, to the following valve rocker arm contact surfaces:
    • Valve pushrod socket (1)
    • Roller pivot (2)
    • Valve stem tip (3)
    4. Fig 3: Valve Rocker Arm Contact Surfaces
    GM480551Courtesy of GENERAL MOTORS CORP.
  4. Install the valve rocker arm assemblies as follows:
    1. Finger start the bolt at location (1)
    2. Finger start the bolt at location (2)
    3. Finger start the bolt at location (3)
    4. Finger start the remaining valve rocker arm bolts
    5. Fig 4: Valve Rocker Arm Assemblies
    GM480580Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Rotate the number 1 cylinder to top dead center (TDC) of the compression stroke. The engine front cover has 2 alignment tabs and the crankshaft balancer has 2 alignment marks which are spaced 90 degrees apart that are used for positioning the number 1 piston at TDC.
  5. Rotate the crankshaft balancer clockwise until the alignment marks on the crankshaft balancer are aligned with the tabs on the engine front cover, 1 with 2 and 3 with 4. At that point the number 1 piston should be at TDC of the compression stroke.
    6. Fig 5: View Of Crankshaft Balancer Alignment Mark & Engine Front Cover Alignment Tab
    GM334551Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
    IMPORTANT: Once the valve rocker arm assemblies are installed and properly torqued, no additional valve lash adjustment is required.
  6. Tighten the valve rocker arm bolts.

    Tighten:  Tighten valve rocker arm bolts to 30 N.m (22 lb ft).

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