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Home >> GMC >> 2003 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 520 (Engine Mechanical (Repair Instructions -- 3 Of 3) -- 4.8L, 5.3L & 6.0L) >> Repair Instructions (Off-Vehicle - Part 3) >> Valve Rocker Arm and Push Rod Installation

Valve Rocker Arm and Push Rod Installation

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    IMPORTANT:
    • When using the valve train components again, 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: Ensure 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:
    • Ensure 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
    GM260140Courtesy of GENERAL MOTORS CORP.
  6. Rotate the crankshaft until number one piston is at top dead center of 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. If viewing from the rear of the engine, the additional crankshaft pilot hole, non-threaded, will be in the 10:30 position.

    The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3.

    Cylinders 1, 3, 5 and 7 are left bank.

    Cylinders 2, 4, 6, and 8 are right bank.

    7. Fig 4: View of Crankshaft/Camshaft In Position For Number 1 Piston At TDC
    GM661566Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  7. With the engine in the number one firing position, tighten the following valve rocker arm bolts:

    Tighten: 

    • Tighten exhaust valve rocker arm bolts 1, 2, 7, and 8 to 30 N.m (22 lb ft).
    • Tighten intake valve rocker arm bolts 1, 3, 4, and 5 to 30 N.m (22 lb ft).

  8. Rotate the crankshaft 360 degrees.
  9. Tighten the following valve rocker arm bolts:

    Tighten: 

    • Tighten exhaust valve rocker arm bolts 3, 4, 5, and 6 to 30 N.m (22 lb ft).
    • Tighten intake valve rocker arm bolts 2, 6, 7, and 8 to 30 N.m (22 lb ft).

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