Valve and Cylinder Head Disassembly and Reassembly Disassembly
Valve and Cylinder Head Disassembly and Reassembly DisassemblyReference: 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).
CAUTION:
When compressing the valve spring, be careful not to damage inner side of the tappet installing hole.
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 degrees C (176 to 212 degrees F) may facilitate valve guide removal.
Special Tool
(A): 09916-44910
Reassembly
Reference: Valve and Valve Guide Inspection
Reference: Cylinder Head Inspection
Reference: 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.
CAUTION:
Clean away shavings from 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 degrees C (176 to 212 degrees 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".
CAUTION:
The same special tool (B) is used to install intake valve guide and exhaust valve guide but the direction in which it is applied differs.
^ 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.
CAUTION:
Clean away shavings from 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.
CAUTION:
When installing, never tap or hit special tool with a hammer or the like. Install seal to guide only pushing special tool by hand.
Tapping or hitting special tool may cause damage to seal.
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.
CAUTION:
When compressing the valve spring, be careful not to damage inside surface of the tappet installing hole.
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 kg-m, 2.5 lbf-ft)
