GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC P42 Commercial Chassis 🢒 Engine 🢒 Engine Mechanical - 6.5L 🢒 Valve Lifter Replacement

Removal Procedure

    Caution: Before servicing any electrical component, the ignition and start switch must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.

    2. Object Number: 60235 Size: SH
  2. Remove the upper intake manifold from the lower intake manifold (L65 only). Refer to Intake Manifold Replacement .
  3. Remove the air cleaner assembly. Refer to Air Cleaner Element Replacement in Engine Controls.

    4. Object Number: 59835 Size: SH
  4. Remove the lower intake manifold from the cylinder heads. Refer to the appropriate procedure:
    5. •  Intake Manifold Replacement (L57)
    •  Intake Manifold Replacement (L65)

    Object Number: 60251 Size: SH
  5. Remove the following components from the cylinder head. Refer to Valve Rocker Arm, Shaft, and Push Rod Replacement :
    6. • The valve rocker arms
    • The valve rocker arm shaft
    • The push rods

    Object Number: 60253 Size: SH
  6. Remove the cylinder head from the engine block. Refer to Cylinder Head Replacement .

    7. Object Number: 59806 Size: SH
  7. Remove the retaining bolts from the valve lifter retaining clamps.
  8. Remove the valve lifter retaining clamps.

    9. Object Number: 59809 Size: SH
  9. Remove the valve lifter guide plates from the engine block.

    10. Object Number: 66589 Size: SH
  10. Remove the valve lifters from the engine block.
  11. Place all of the following components in a organizer rack:
    12. • The valve lifters
    • The valve lifter guides
    • The retainers
    • The bolts

Installation Procedure

    Object Number: 66589 Size: SH

    Important: Replace the lifters when you install a new camshaft. Some engines will have both standard and 0.25 mm (0.010 in) oversize valve lifters. The oversize lifter will have the number 10 etched on the side. The block will be stamped OS on the cast pad adjacent to the lifter bore and on the top rail of the cylinder case above the lifter bore.

  1. Install the valve lifters to the engine block.
    2. • Prime the new valve lifters before installation by working the lifter plunger while the plunger is submerged in clean kerosene or diesel fuel.
    • Coat the lifter roller and the bearings with lubricant GM P/N 1052367, or equivalent.
    • Install the lifters in the original locations.

    Object Number: 59809 Size: SH

    Important: Ensure that the straight edge of the guide plates and the clamps face away from the cylinders.

  2. Install the valve lifter guide plates to the engine block.

    3. Object Number: 59806 Size: SH

    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.

  3. Install the clamps.

    4. Tighten
    Tighten the clamp bolts to 27 N·m (20 lb ft).

  4. After installing the clamps, turn the crankshaft by hand 720 degrees (2 full turns), in order to ensure the free movement of the lifters in the guide plates.

    5. If the engine will not turn over by hand, one or more of the lifters may be binding in the guide plates.


    Object Number: 60253 Size: SH
  5. Install the cylinder head assembly to the engine block. Refer to Cylinder Head Replacement .
  6. Install the following components to the cylinder head. Refer to Valve Rocker Arm, Shaft, and Push Rod Replacement :
    7. • The valve rocker arms
    • The valve rocker arm shaft
    • The push rods

    Object Number: 59835 Size: SH
  7. Install the lower intake manifold to the engine block. Refer to the appropriate procedure:
    8. •  Intake Manifold Replacement (L57)
    •  Intake Manifold Replacement (L65)

    Object Number: 60235 Size: SH
  8. Install the upper intake manifold to the engine block (L65 only). Refer to Intake Manifold Replacement .
  9. Install the air cleaner assembly. Refer to Air Cleaner Element Replacement in Engine Controls.
  10. Connect the negative battery cable.