Valve Spring, Retainer and Stem Seal

Provided damage has not occurred, broken valve springs or damaged valve stem seals and retainers may be replaced without removing the cylinder head.

Tools Required:

• Valve Spring Compressor T70P-6049-A
• Valve Stem Seal Replacer T87L-6571-BH

Removal

1. Remove the valve rocker arm cover and the applicable spark plug. Ensure the piston is at the top of its stroke with both valves closed to prevent accidental dropping of the valve into the cylinder.

2. Install an air line with an adapter in the spark plug hole and turn on the air supply. Failure of the air pressure to hold the valve(s) closed while performing the following steps is an indication of valve or valve seat damage and necessitates removal of the cylinder head.

3. Remove the valve rocker arm fulcrum bolts. Remove the fulcrum, rocker arm, fulcrum guide and push rods, or the roller rocker assembly, pedestal assembly and push rods from the applicable cylinder and note their positions so they can be installed in their original positions.

4. Install the fulcrum bolt and position the Valve Spring Compressor T70P-6049-A. Compress the valve spring and remove the retainer locks, sleeve, spring retainer and valve spring.

5. Remove and discard the valve stem seal.

6. If air pressure has forced the piston to the bottom of the cylinder, any loss of air pressure will allow the valve(s) to fall into the cylinder. A rubber band, tape or string wrapped around the end of the valve stem will prevent this from happening but will still allow enough travel to check the valve for binds.

Installation

 CAUTION: If the valve has been damaged, it will be necessary to remove the cylinder head for service.

1. Remove air pressure from spark plug adapter. Inspect the valve stem for damage. Rotate the valve and check the valve stem tip for eccentric movement during rotation. Move the valve up and down through normal travel in the valve guide and check the stem for binds.

2. If the condition of the valve is satisfactory, apply Engine Assembly Lubricant D9AZ-19579-D (ESR-M99C80-A) or equivalent to the valve stem and hold the valve closed. Apply the air pressure within the cylinder.

3. Install new exhaust valve stem seals. Use a 5/8-inch deep well socket and a light hammer or mallet to seat the seal on the valve guide using Valve Stem Seal Replacer T87L-6571-BH. Place the spring in position over the valve and install the valve spring retainer and sleeve, if so equipped. Compress the valve spring and install the valve spring retainer locks. Remove the compressor tool and fulcrum bolt.

4. Turn OFF the air pressure and remove the air line and adapter. Install the spark plug.

5. Apply Multi-Purpose Grease D0AZ-19584-AA (ESR-M1C159-A and ESB-M1C93-A) or equivalent to both ends of the push rods. Install the push rods. Apply Multi-Purpose Grease D0AZ-19584-AA (ESR-M1C159-A and ESB-M1C93-A) or equivalent to the tip of the valve stems.

6. Apply Multi-Purpose Grease D0AZ-19584-AA (ESR-M1C159-A and ESB-M1C93-A) or equivalent, to the push rod socket, underside of the fulcrum seat and the valve pad or roller of the rocker arm. Install the fulcrum guides or pedestal assemblies, valve rocker arms, and fulcrum seats or roller rocker assembly and fulcrum bolts. Tighten bolts to 24-34 Nm (18-25 lb-ft).

7. Clean and install the rocker arm cover using a new service gasket.

   If the RH cover was removed, install the closure tube. Install valve cover and tighten cover screws to 16-20 Nm (12-15 lb-ft).

8. Run the engine and check for leaks.