Tools Required

Important: Rotate the engine so that the cylinder to be serviced is at top dead center before removing the valve keys. Do this in order to prevent the valve from falling into the cylinder.

1. Remove the valve rocker arm and pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
2. Remove the spark plug at the cylinder to be serviced.



3. Install the J 22794 . Apply compressed air in order to hold the valve in place.

Notice: When using the valve spring compressor, be careful not to scratch or gouge the valve stem.

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



5. Remove the valve stem key.
6. Remove the valve spring cap.
7. Remove the oil shield on the exhaust valves.
8. Remove the valve spring.
9. Remove the dampener.
10. Remove the valve stem O-ring seal.
11. Remove the intake valve stem oil seal.

Notice: Use hand pressure only when installing the valve stem oil seal using the J 41512. Using too much force may cause damage to the oil seal and possibly lead to excessive oil consumption.

1. Use the following procedure in order to install the intake valve stem oil seal:

1.1.	Place the oil seal over the valve stem so that the seal contacts the valve guide.

1.2.	Use the J 41512 in order to push the valve stem oil seal over the valve guide.




2. Install the valve stem O-ring seal.
3. Install the valve spring dampener.
4. Install the valve spring.
5. Install the valve spring oil shield on the exhaust valve.
6. Install the valve cap.
7. Use the in order to compress the valve spring.
8. Use the following procedure in order to install the valve stem key:

8.1.	Use grease in order to hold the key in place while disconnecting the J 22794 .

8.2.	Remove theJ 22794 .

8.3.	Ensure that the key seats properly in the upper groove of the valve stem.

8.4.	Tap the end of the stem with a plastic-faced hammer in order to seat the key.

9. Install the spark plug.

Tighten
Tighten the spark plug to 27 N·m (20 lb ft).

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.




10. Use the following procedure in order to inspect the valve stem O-ring seal for leaks:

10.1.

Place the J 23738-A over the end of the valve stem and against the valve cap.

10.2.

Operate theJ 23738-A .

10.3.

Ensure that no air leaks past the valve stem O-ring.

11. Measure the valve spring installed height.
12. Install the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .