Disassembly and Assembly

Part 1:

Part 2:

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 valve spring compressor, attachment and adapter (SST). Remove valve collet with magnet hand.

CAUTION: When working, take care not to damage valve lifter holes.

4. Remove valve spring retainer and 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 using valve oil seal puller (SST).
7. Remove valve spring seat.
8. If valve seat must be replaced, refer to "VALVE SEAT REPLACEMENT".
9. If valve guide must be replaced, refer to "VALVE GUIDE REPLACEMENT".
10. Remove spark plug tube, as necessary.
^ Using pliers, pull spark plug tube out of cylinder head.

CAUTION:
^ Take care 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. When valve guide is removed, install it. Refer to "VALVE GUIDE REPLACEMENT".
2. When valve seat is removed, install it. Refer to "VALVE SEAT REPLACEMENT".





3. Install valve oil seal.
^ Install with valve oil seal drift (SST) to match dimension in the figure.
Height "H" (Without valve spring seat installed)
Intake and exhaust: 14.3 - 14.9 mm (0.563 - 0.587 inch)
4. Install valve spring seat.
5. Install valve.
^ Larger diameter valve is for intake side.





6. Install valve spring (uneven pitch type).
^ Install narrow pitch end (paint mark) to cylinder head side (valve spring seat side).
7. Install valve spring retainer.





8. Install valve collet.
^ Compress valve spring with valve spring compressor, attachment and adapter (SST). Install valve collet with magnet hand.

CAUTION: When working, take care not to damage valve lifter holes.

^ Tap valve stem edge lightly with plastic hammer after installation to check its installed condition.
9. Install valve lifter.





10. Install spark plug tube.
^ Press-fit spark plug tube as follows:
a. Remove old high strength locking sealant adhering to cylinder head mounting hole.
b. Apply high strength locking sealant to area within approximately 12 mm (0.47 inch) from edge of spark plug tube press-fit side. Use Genuine High Strength Locking Sealant or equivalent. Refer to "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS".
c. Using drift, press-fit spark plug tube so that its height "H" is as specified in the figure.
Standard press-fit height "H": 38.1 - 39.1 mm (1.500 - 1.539 inch)

CAUTION:
^ When press-fitting, take care not to deform spark plug tube.
^ After press-fitting, wipe off high strength locking sealant protruding onto cylinder-head upper face.

11. Install spark plug.