Disassembly and Assembly

Cylinder Head: Disassembly and Assembly

Disassembly

1) Remove spark plug.
2) Remove valve lifter.
- Identify installation positions, and store them without mixing them up.
3) Remove valve collet, valve spring retainer and valve spring using Tool.











CAUTION:
- When working, be careful not to damage valve lifter holes.
- Do not remove valve spring seat from valve spring.

4) Push valve stem to combustion chamber side, and remove valve.
- Identify installation positions, and store them without mixing them up.
5) Remove valve oil seal using Tool.











6) When valve seat must be replaced, refer to [Cylinder Head: Inspection After Disassembly] Inspection After Disassembly.
7) When valve guide must be replaced, refer to [Cylinder Head: Inspection After Disassembly] Inspection After Disassembly.
8) Remove spark plug tube, if necessary.
- Remove it from cylinder head using suitable tool.

CAUTION:
- Be careful not to damage cylinder head.
- Once removed, spark plug tube will be deformed and cannot be reused. Do not remove it unless absolutely necessary.

Assembly

1) Install valve guide if removed. Refer to [Cylinder Head: Inspection After Disassembly] Inspection After Disassembly.
2) Install valve seat if removed. Refer to [Cylinder Head: Inspection After Disassembly] Inspection After Disassembly.
3) Install valve oil seal using Tool.











NOTE:
Install with the valve oil seal to match dimension as shown.





4) Install valve.

NOTE:
Install larger diameter to intake side.

5) Install valve spring (with valve spring seat).






NOTE:
- Install smaller pitch (valve spring seat side) to cylinder head side.
- Confirm identification color of valve spring.






6) Install valve spring retainer.
7) Install valve collet using Tool.






- Install valve collet with a magnet hand.






CAUTION:
When working, be careful not to damage valve lifter holes.

- Tap valve stem edge lightly with a plastic hammer after installation to check its installed condition.
8) Install valve lifter.
- Install it in the original position.
9) Install spark plug tube if removed.





- Press-fit it into cylinder head as follows:
a) Remove old sealant from cylinder head side installation hole.
b) Apply sealant within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.
Use Genuine High Strength Locking Sealant or equivalent. Refer to [Recommended Chemical Products and Sealants] Recommended Chemical Products and Sealants.
c) Press-fit spark plug tube so that its height (H) is as specified using suitable tool.






CAUTION:
- When press-fitting, be careful not to deform spark plug tube.
- After press-fitting, wipe off any protruding sealant on top surface of cylinder head.

10) Install spark plug.