Tools Required

1. Remove the valve rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement .
2. Disconnect the spark plug wire at the spark plug.

•	Twist each plug wire boot 1/2 turn.

•	Pull only on the boot in order to remove the wire from the spark plug.





Important: Remove the spark plugs from the cylinder head with the engine at room temperature.

3. Loosen the spark plug 1 or 2 turns.
4. Brush or air blast away any dirt or debris from around the spark plug.
5. Remove the spark plug.



6. Install J 22794 into the spark plug hole.
7. Attach an air hose to J 22794 .
8. Apply compressed air to J 22794 in order to hold the valves in place.



9. Use J 38606 in order to compress the valve spring.



10. Remove the valve stem keys (3).
11. Carefully release the valve spring tension.
12. Remove the J 38606 .
13. Remove the valve spring cap (4).
14. Remove the valve spring (5).

Important: A second design valve stem oil seal and shim may be used on later engines.

A separate spring shim is not required with the second design seal and shim.
15. Remove the valve stem oil seal (6) (first design).
16. Remove the valve spring shim (7) (first design).
17. Remove the valve stem oil seal and shim (2) (second design)

1. Clean the cylinder head valve spring seat and/or shim area.
2. Install the valve spring shim (7) (first design).
3. Install the valve stem oil seal and shim (2) (second design).

J 42078 is not required for installation of the second design seal and shim.





Important: The valve stem oil seal alignment and position on the valve guide is critical.

An improperly installed valve stem oil seal may lead to excessive oil consumption, increased vehicle emissions, or component damage.
4. Install the valve stem oil seal (first design) onto the guide.

4.1.	Lubricate the valve guide and valve stem oil seal with clean engine oil.

4.2.	Install the valve stem oil seal (first design) onto the valve stem. Push the seal down until the seal contacts the valve guide.

4.3.	Use the J 42078 in order to install the valve stem oil seal.

Push or lightly tap the tool until the tool bottoms against the valve spring shim.




5. Measure the valve stem oil seals (first design) for the properly installed height.

There should be a 18.1-19.1 mm (0.712-0.752 in) gap between the top edge of the oil seal body and the valve spring shim surface.




6. Install the valve spring (5).
7. Install the valve spring cap (4).



8. Compress the valve spring using the J 38606 .
9. Install the valve keys.

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

•	Make sure the keys seat properly in the groove of the valve stem.

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

•	Remove the J 38606 .

•	Tap the end of the valve stem with a plastic faced hammer to seat the keys (if necessary).




10. Remove J 22794 from the spark plug port.




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.

11. Hand start the spark plug.

Tighten
Tighten the spark plug to 15 N·m (11 lb ft).

12. Install the spark plug wires at the ignition coil.
13. Install the spark plug wire to the spark plug.
14. Inspect the wires for proper installation:

•	Push sideways on each boot in order to check for proper installation.

•	Reinstall any loose boot.

15. Install the valve rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement .