GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 GMC C Pickup - 2WD 🢒 Engine 🢒 Engine Mechanical - 6.5L 🢒 Valve Stem Oil Seal and Valve Spring Replacement

Removal Procedure

Tools Required

    • J 26999-10 Compression Gauge Adapter
    •  J 26999-30 Compression Gauge Adapter
    •  J 38606 Valve Spring Compressor

    Object Number: 66613 Size: SH
  1. Disconnect both the battery negative cables from the batteries. Refer to Battery Replacement in Engine Electrical.
  2. Remove the valve rocker arm, shaft, and pushrod from the engine block. Refer to Valve Rocker Arm, Shaft, and Push Rod Replacement .
  3. Remove the glow plug from the cylinder being serviced.
    4. • For the left cylinder head, refer to Glow Plug Replacement - Left Side in Engine Controls-6.5L-L65.
    • For the right cylinder head, refer to Glow Plug Replacement - Right Side in Engine Controls-6.5L-L65.
  4. Rotate the engine until the piston in the cylinder being serviced is at the bottom of the piston stroke. This is to ensure that the engine does not rotate when compressed air is applied to the cylinder being serviced.
  5. Use the J 26999-10 left side of the engine and J 26999-30 for the right side of the engine when applying the compressed air to the cylinder being serviced.

    6. Important: Make sure that the compressed air is not released, until the repair the is completed.

  6. Apply compressed air into the cylinder being serviced.
  7. Tap lightly on the valve spring cap or rotator to loosen the valve keys.
  8. Use the J 38606 in order to compress the valve spring.
  9. Compress the valve spring.

    10. Object Number: 526635 Size: SH
  10. Remove the valve keys from the retainers from the cylinder being serviced.
  11. Carefully release the valve spring tension and remove the J 38606 .
  12. Remove the valve stem oil seals from the valve guides.

Installation Procedure

Tools Required

    • J 26999-10 Compression Gauge Adapter
    •  J 26999-30 Compression Gauge Adapter
    •  J 38606 Valve Spring Compressor

Important: The air pressure should remain applied to the cylinder being serviced until after the repair has been completed.


    Object Number: 526635 Size: SH
  1. Apply a small amount of clean engine oil to the valve stem and to the new valve stem oil seal.
  2. Install the valve stem oil seal to the valve stem.
  3. Install the valve spring, cap, rotator and shield.
  4. Use the J 38606 to compress the valve spring.

    5. Object Number: 66613 Size: SH
  5. Install valve spring assembly to the cylinder head.
  6. Install the valve keys in the retainer.
    7. • Apply a small amount of grease on the valve stem end. This will help to hold the valve keys in place.
    • Carefully release the valve spring pressure. Make sure the valve key are properly seated in the cap.
    • Remove theJ 38606 from the valve spring.
  7. Slowly release the compressed air from the cylinder being serviced.
  8. Remove the J 26999-10 when working on the left side of the engine and J 26999-30 for the right side of the engine.
  9. Install the glow plug to the cylinder head.
    10. • For the left cylinder head, refer to Glow Plug Replacement - Left Side in Engine Controls-6.5L-L65.
    • For the right cylinder head, refer to Glow Plug Replacement - Right Side in Engine Controls-6.5L-L65.

    Important: All the valve train components must be reassembled in the exact order and position from which they were removed.

  10. Install the valve rocker arm and pushrod to the cylinder head. Refer to Valve Rocker Arm, Shaft, and Push Rod Replacement .
  11. Connect both the battery negative cables to the batteries. Refer to Battery Replacement in Engine Electrical.