Valve Service

COMPONENTS

DISASSEMBLY





1. Using the special tool, Valve Spring Compressor (09221 - 29100) remove the retainer lock. Next remove the spring retainer, valve spring spring seat and valve.Next remove the spring retainer, valve spring, spring seat and valve.

NOTE: Keep these parts in order so they can be reinstalled in their original positions.





2. Remove the valve stem oil seals using special tool. Valve stem oil seal remover (09222 - 29000)

NOTE: Do not reuse the valve stem seals.

INSPECTION
Valves





1. Using a wire brush, clean the valve thoroughly.





2. Check each valve for wear, damage and distortion of head and stem at B. Repair or correct if necessary.If stem end A. Is pitted or worn, resurface as necessary. This correction must be limited to a minimum. Also resurface the valve face.Replace the valve if the margin has decreased to less than the service limit.

Margin:
Standard value:
Intake: 1.1 mm (0.0433 inch)
Exhaust: 1.3 mm (0.0512 inch)
Limit:
Intake: 0.8 mm (0.0391 inch)
Exhaust: 1.0mm (0.039 inch)

Valve Springs





1. Check the valve spring free length and tension. If they exceed the service limit, replace the spring.
2. Using a square, test the squareness of each spring. If the spring is excessively out of square, replace it.

Valve spring:
Standard value:
Free height: 46.07 mm (1,8137 inch)
Load:
25.5 kg at 37 mm
57.3 kg at 28 mm
Out of square: 3° or less

Valve Guides





Check the valve stem to guide clearance. If the clearance exceeds the service limit, replace the valve guide with next oversize part.

Valve stem-to-guide clearance:
Standard value:
Intake: 0.020-0.050 mm (0.0008-0.0019 inch)
Exhaust: 0.050-0.085 mm (0.0019-0.0033 inch)
Limit:
Intake: 0.1 mm (0.004 inch)
Exhaust: 0.15 mm( 0.006 inch)

Valve Seat Insert





Check the valve seat for evidence of overheating and improper contact with the valve face. Replace the seat if necessary.

Before reconditioning the seat, check the valve guide for wear. If the valve guide is worn, replace it, then recondition the seat. Recondition the valve seat with a valve seat grinder or cutter. The valve seat contact width should be within specifications and centered on the valve face.

INSTALLATION

NOTE:
1) Clean each part before assembly.
2) Apply engine oil to sliding and rotating parts.





1. After installing the spring seat, fit the stem seal onto the valve guide.
To install, fit the seal in by lightly tapping the Special Tool, Valve Stem Oil Seal Installer(09222 - 22000).

The seal is installed in the specified position by means of the special tool. Incorrect installation of the seal will adversely affect the lip l.D. and eccentricity, resulting in oil leaking down the valve guides. Therefore, when installing, be careful not to twist the seal. Do not reuse old stem seals.





2. Apply engine oil to each valve stem. Insert the valves into the valve guides. Avoid using force when inserting the valve into the seal. After insertion, check to see if the valve moves smoothly.
3. Install springs and spring retainers. Valve springs should be installed with the enamel coated side toward the valve spring retainer.





4. Using special tool, Valve Spring Compressor (09221 - 29100),compress the spring.Be careful that the valve stem seal is not distorted by the bottom of the retainer. Then install the retainer locks.After installation of the valves, make certain that the retainer locks are properly installed.

5. Install the cylinder head.