Engine top end 5-25

Valves

Valve Clearance Inspection

• Refer to the Valve Clearance Inspection in the Periodic
Maintenance chapter.

Valve Removal

• Remove the cylinder head (see Cylinder Head Removal).

• Use a valve spring compressor assembly to press down the valve spring retainer, and remove the split keepers.

Special Tools -Valve Spring Compressor Assembly: 57001 -241 [A] Valve Spring Compressor Adapter, ф22: 57001-1202 [B]

Valve Installation

• Check to see that the valve [A] moves smoothly up and down in the guide.

• Check to see that the valve seats properly in the valve seat. If it does not, repair the valve seat.

• Replace the oil seal [B] with a new one.

• Apply a thin coat of molybdenum disulfide grease to the valve stem before valve installation.

• Be sure to install the inner [C] and outer [D] spring seats under the inner [E] and outer [F] springs.

OInstall the springs so that the closed coil end [G] is facing toward the valve seat (downwards).

• Install the spring retainer [H], press it down with the valve
spring compressor assembly, and fit the split keepers [I]
into place.

Special Tools -Valve Spring Compressor Assembly: 57001 -241 Valve Spring Compressor Adapter, ф22: 57001-1202

• Install the other removed parts.

Valve Guide Removal

• Remove:

Valve (see Valve Removal) Oil Seal Spring Seats

• Heat the area around the valve guide to about 120 ~
150°C (248 ~ 302°F), and hammer lightly on the valve
guide arbor [A] to remove the guide from the top of the
head.

Special Tool - Valve Guide Arbor, ф5.5: 57001-1021