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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical - 4.3L (LV1)) >> Repair Instructions >> Valve Rocker Arm and Push Rod Installation

Valve Rocker Arm and Push Rod Installation

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  1. GM3641500Courtesy of GENERAL MOTORS COMPANY

    Ensure the pushrods seat properly to the ends of the rocker arms.

  2. GM4807894Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • 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.
    • Lubricate the flange of the valve rocker arm bolts with clean engine oil.
    • Lubricate the valve rocker arms and pushrods with clean engine oil.
    • Ensure the pushrods seat properly to the valve lifter sockets.
    • The rocker arm bolts are not serviced separately.
    • Ensure the pushrods seat properly to the ends of the rocker arms.
    • DO NOT tighten the rocker arm bolts at this time.

    Install the valve rocker arm (2) and pushrod (1).

  3. GM1658285Courtesy of GENERAL MOTORS COMPANY

    Rotate the crankshaft until number 1 piston is at top dead center of compression stroke.

    In this position, cylinder number 1 rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position. The camshaft and crankshaft sprocket alignment marks (1, 2) will be in the 12 o'clock 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, 6, 5, 4, 3, 2.

    Cylinders 1, 3, and 5 are left bank.

    Cylinders 2, 4, and 6 are right bank.

  4. CAUTION:

    Refer to Fastener Caution

  5. With the engine in the number 1 firing position, tighten the following valve rocker arm bolts:
    1. tighten the exhaust valve rocker arm bolts 1, 5, and 6 to 30 N.m (22 lb ft).
    2. tighten the intake valve rocker arm bolts 1, 3, and 2 to 30 N.m (22 lb ft).
  6. Rotate the crankshaft 360 degrees.
  7. tighten the following valve rocker arm bolts:
    • tighten the exhaust valve rocker arm bolts 3, 2, and 4 to 30 N.m (22 lb ft).
    • tighten the intake valve rocker arm bolts 5, 4, and 6 to 30 N.m (22 lb ft).