Tools Required

1. Remove the engine cover from the vehicle. Refer to Engine Cover Replacement in Body and Accessories.
2. Disconnect the battery negative cables from the batteries.

•	For the front battery, refer to Battery Cable Replacement in Engine Electrical.

•	For the auxiliary battery, refer to Battery Cable Replacement in Engine Electrical.

3. Remove the valve rocker arm covers from the cylinder head. Refer to Valve Rocker Arm Cover Replacement .
4. Remove the valve rocker arm shaft with the valve rocker arms. Mark the assemblies so these can be returned to the original locations. Refer to Valve Rocker Arm, Shaft, and Push Rod Replacement .
5. Remove the glow plugs from the cylinders being serviced.

Important: Rotate the cylinder to be service to the bottom of the stroke. This is to ensure that the engine does not rotate when the compressed air is applied to the cylinder being serviced.

6. Install the J 26999-10 or the J 26999-30 into the glow plug hole.
7. Apply compressed air to hold the valves in place. If the compressed air is released, the valves can drop into the cylinder.
8. Use the J 38606 in order to compress the valve spring. If the spring will not compress, tap on the tool lightly with a mallet in order to loosen the cap or rotator from the valve keys.



9. Remove the valve keys from the valve stem.



10. Carefully release the valve spring tension.
11. Remove the cap or the rotator, the shield, and the valve spring with the damper.
12. Remove the valve stem oil seals.

Notice: Air pressure should remain applied to the cylinder for installation.

1. Apply a small amount of clean engine oil to the valve stem.
2. Install the new valve stem oil seals.
3. Install the valve spring with the damper, the shield, and the cap or the rotator.
4. Install the valve keys to the valve stem.

•	Install the valve keys. Use grease in order to hold the valve keys in place.

•	Carefully release the valve spring pressure. Make sure the valve keys stay in place.

•	Remove the J 38606 or the J 26999-30 and the J 26999-10 .




5. Install the glow plugs to the cylinders being serviced.
6. Install the valve rocker arm shaft with the valve rocker arms. Refer to Valve Rocker Arm, Shaft, and Push Rod Replacement .
7. Install the valve rocker arm covers to the cylinder head. Refer to Valve Rocker Arm Cover Replacement .
8. Install the engine cover to the vehicle. Refer to Engine Cover Replacement in Body and Accessories.
9. Connect the battery negatives cables to the batteries.

•	For the front battery, refer to Battery Cable Replacement in Engine Electrical.

•	For the auxiliary battery, refer to Battery Cable Replacement in Engine Electrical.