Disassembly And Assembly

CYLINDER HEAD

Disassembly and Assembly


DISASSEMBLY

1.Remove spark plug with spark plug wrench (commercial service tool).
2.Remove valve lifter.
- Identify installation positions, and store them without mixing them up.
3.Remove valve collet.





- Compress valve spring with the valve spring compressor [SST:
KV-10116200 (J-26336-A)] (A), the attachment [SST:
KV-10115900 (J-26336-20)] (C), and the adapter [SST:
KV-10109220 (-)] (B). Remove valve collet with a magnet hand.

CAUTION:
- Be careful not to damage valve lifter holes.





- Fit the attachment [SST: KV-10115900 (J-26336-20)] in the center of valve spring retainer to press it.





4.Remove valve spring retainer and valve spring (with valve spring seat).

CAUTION:
Never remove valve spring seat from valve spring.
5.Push valve stem to combustion chamber side, and remove valve.
- Identify installation positions, and store them without mixing them up.





6.Remove valve oil seal with a valve oil seal puller [SST:
KV-10107902 (J-38959)] (A).
7.When valve seat must be replaced.
- Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess in cylinder head. Set the machine depth stop to ensure this. [1][2]Cylinder Head Assembly.

CAUTION:
Never bore excessively to prevent cylinder head from scratching.
8.When valve guide must be replaced.





a.To remove valve guide, heat cylinder head to 110 to 130�C (230
to 266�F) by soaking in heated oil (A).





b.Drive out valve guide with a hammer and valve guide drift (commercial service tool).

CAUTION:
Cylinder head contains heat, wear protective equipment to avoid getting burned.

ASSEMBLY

1.When valve guide is removed, install it.

CAUTION:
Replace with oversize [0.2 mm (0.008 in)] valve guide.





a.Ream cylinder head valve guide hole with a valve guide reamer (commercial service tool) (A).
For service parts: Oversize [0.2 mm (0.008 in)]
[1][2]Cylinder Head Assembly.





b.Heat cylinder head to 110 to 130�C (230 to 266�F) by soaking in heated oil (A).





c.Press valve guide (1) from camshaft side to dimensions as shown in the figure.





Projection (H): [1][2]Cylinder Head Assembly.

CAUTION:
Cylinder head contains heat, wear protective equipment to avoid getting burned.





d.Apply reamer finish to valve guide with a valve guide reamer (commercial service tool) (A).
Standard: [1][2]Cylinder Head Assembly.
2.When valve seat is removed, install it.

CAUTION:
Replace with oversize [0.5 mm (0.020 in)] valve seat.





a.Ream cylinder head (1) recess diameter for service valve seat (2).
For service parts: Oversize [0.5 mm (0.020 in)]
[1][2]Cylinder Head Assembly.
- Be sure to ream in circles concentric to the valve guide center.
This will enable valve seat to fit correctly.





b.Heat cylinder head to 110 to 130�C (230 to 266�F) by soaking in heated oil (A).
c.Provide valve seats cooled well with dry ice. Press-fit valve seat into cylinder head.

CAUTION:
- Never touch cold valve seats directly.
- Cylinder head contains heat, wear protective equipment to avoid getting burned.





d.Using valve seat cutter set (commercial service tool) or valve seat grinder, finish valve seat to the specified dimensions. For dimensions, [1][2]Cylinder Head Assembly.

CAUTION:
When using valve seat cutter, firmly grip the cutter handle with both hands. Then, press on the contacting surface all around the circumference to cut in a single drive. Improper pressure on with the cutter or cutting many different times may result in stage valve seat.
e.Using compound, grind to adjust valve fitting.
f.Check again for normal contact. Inspection.
3.Install valve oil seal.





- Install with a valve oil seal drift [SST: KV-10115600 (J-38958)]
(A) to match dimension in the figure.
NOTE:
Dimension is height that measured before installing valve spring (with valve spring seat).

Height (H) : 15.1 - 15.7 mm (0.594 - 0.618 in)

4.Install valve.
- Install larger diameter to intake side.
5.Install valve spring (with valve spring seat).





- Install smaller pitch (valve spring seat side) to cylinder head side (B).





- Confirm identification color (A) of valve spring.

Intake : White
Exhaust : Yellow green

6.Install valve spring retainer.
7.Install valve collet.





- Compress valve spring with the valve spring compressor [SST: KV-10116200 (J-26336-A)] (A), the attachment [SST: KV-10115900 (J-26336-20)] (C), and the adapter [SST: KV-10109220 (-)] (B). Install valve collet with a magnet hand.

CAUTION:
When working care 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 with spark plug wrench (commercial service tool).