GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Blazer - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Valve Rocker Arm and Push Rod Installation

    Object Number: 480529 Size: SH

    Important: Be sure to keep parts in order. Parts must be reinstalled into the original location and position.

  1. Install the valve pushrods.

    2. Object Number: 480578 Size: SH

    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. Object Number: 480551 Size: SH
  3. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent, to the following valve rocker arm contact surfaces:
    4. • Valve pushrod socket (1)
    • Roller pivot (2)
    • Valve stem tip (3)

    Object Number: 480580 Size: SH
  4. Install the valve rocker arm assemblies as follows:
    5. 4.1. Finger start the bolt at location (1)
    4.2. Finger start the bolt at location (2)
    4.3. Finger start the bolt at location (3)
    4.4. Finger start the remaining valve rocker arm bolts

    Object Number: 334551 Size: SH

    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. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    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.

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