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Home >> GMC >> 2003 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 497 (Engine Mechanical (Repair Instructions -- 1 Of 3) -- 4.8L, 5.3L & 6.0L) >> Repair Instructions (On-Vehicle & Off-Vehicle - Part 1) >> On-Vehicle Repair Instructions >> Valve Rocker Arm and Push Rod Replacement >> Installation Procedure

Installation Procedure

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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 rocker arms and pushrods with clean engine oil.
  2. Lubricate the flange of the rocker arm bolts with clean engine oil.

    Lubricate the flange or washer surface of the bolt that will contact the rocker arm.

  3. Install the 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 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 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).

  8. Rotate the crankshaft 360 degrees.
  9. Tighten the following 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 rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left  or Valve Rocker Arm Cover Replacement - Right .
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