Disassembly and Reassembly
Valve and Cylinder Head Disassembly and Reassembly
Disassembly
Valve and Cylinder Head Removal and Installation
NOTE:
Parts must go back in the position where they were. Keep them in the following order:
- Valve cotter
- Valve spring retainer
- Valve spring
- Valve spring seat
- Intake valve
- Exhaust valve
- Tappet
1) Remove oil venturi plug (1).
2) Remove tappets from cylinder head.
3) Use special tools (A) and (B) to compress valve spring and use special tool (C) to remove valve cotters (1).
NOTE:
Damaging the wall surface of the tappet fitting hole could result in engine problems. Prevent the special tool from touching the tappet sliding surface in the cylinder head.
Special Tool
(A): 09916-14510
(B): 09916-14522
(C): 09916-84511
4) Release special tools (A) and (B), and remove spring retainer and valve spring.
5) Remove valve.
6) Remove valve stem seal (1) and valve spring seat (2).
7) Use special tool to remove valve guide from combustion chamber side to valve spring side.
NOTE:
Heating cylinder head 80 to 100 °C (176 to 212 °F) may facilitate valve guide removal.
Special Tool
(A): 09916-44910
Reassembly
Valve and Valve Guide Inspection
Cylinder Head Inspection
Valve Spring Inspection
1) Before installing valve guide into cylinder head, ream guide hole with special tool (A) so as to remove burrs and make it truly round.
NOTE:
The engine could be damaged if shavings remain inside the valve guide hole after reaming it.
Be sure to thoroughly remove shavings from the reamed hole.
Special Tool
(A): 09916-37320
(B): 09916-34542
2) Use special tools to install valve guide to cylinder head as follows.
Special Tool
(A): 09916-58210
(B): 09916-56510
NOTE:
- Never reuse valve guide.
Install new oversized valve guide.
- Intake and exhaust valve guides are identical.
a) Uniformly heat cylinder head to a temperature of 80 to 100 °C (176 to 212 °F) so that it will not be distorted, and drive new valve guide into guide hole with special tools.
b) Install new valve guide until special tool contacts cylinder head.
After installation, make sure that valve guide protrudes from cylinder head by specified dimension "a".
NOTE:
For installing intake valve guide and exhaust valve guide, the same special tool (B) is used, but its application direction is different. Use it in proper direction.
- For intake valve guide
The side (2) should be directed to valve guide.
- For exhaust valve guide
The side (1) should be directed to valve guide.
Valve guide protrusion "a"
IN: 16.3 - 16.7 mm (0.642 - 0.657 in.)
EX: 12.3 - 12.7 mm (0.485 - 0.500 in.)
3) Ream valve guide bore with special tool.
NOTE:
The engine could be damaged if shavings remain inside the valve guide hole after reaming it.
Be sure to thoroughly remove shavings from the reamed hole.
Special Tool
(A): 09916-34550
(B): 09916-34542
4) Install valve spring seat to cylinder head.
5) Install new valve stem seal (1) to valve guide.
After applying engine oil to valve stem seal and spindle of special tool (A), fit valve stem seal to spindle, and then install valve stem seal to valve guide pushing special tool by hand.
After installation, check that valve stem seal is properly fixed to valve guide.
NOTE:
If the valve stem seal is installed by striking the special tool with a hammer or other similar tool, the valve stem seal may be damaged, causing oil to get down past the seal.
Be sure to push the special tool only by hand to force the valve stem seal into position.
Special Tool
(A): 09917-98221
(B): 09916-58210
6) Apply engine oil to valve stem, then install valve to valve guide.
7) Install valve spring and valve spring retainer.
NOTE:
Valve spring does not have specific direction for installation.
8) Use special tools to compress valve spring and fit two valve cotters (1) into groove in valve stem.
NOTE:
Damaging the wall surface of the tappet fitting hole could result in engine problems.
Prevent the special tool from touching the tappet sliding surface in the cylinder head.
Special Tool
(A): 09916-14510
(B): 09916-14522
(C): 09916-84511
9) Install venturi plug (1).
Tightening torque
Venturi plug (a): 3.5 Nm (0.36 kgf-m, 2.5 lbf-ft)
