Disassembly and Assembly
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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, the attachment and the adapter (SST). Remove valve collet with a magnet hand.
CAUTION: When working, take care not to damage valve lifter holes.
4. Remove valve spring retainer, valve spring and valve spring seat.
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 the valve oil seal puller (SST).
7. If valve seat must be replaced, refer to Specifications.
8. If valve guide must be replaced, refer to Specifications.
9. Remove spark plug tube, as necessary.
^ Using a 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.
2. When valve seat is removed, install it.
3. Install new valve oil seals as follows:
a. Apply new engine oil on valve oil seal joint and seal lip.
b. Install with the 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 valves are for intake side.
NOTE: Larger diameter valves are for intake side.
6. Install valve spring (uneven pitch type).
^ Install narrow pitch end (paint mark) to cylinder head side (valve spring seat side).
^ Intake side and exhaust side valve springs are different. Install them referring to the following paint mark collar.
Paint mark collar
Intake and Exhaust: Blue
7. Install valve spring retainer.
8. Install valve collet.
^ Compress valve spring with the valve spring compressor, the attachment and the adapter (SST). Install valve collet with a 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.
^ Install it in the original position.
10. Install spark plug tube.
^ Press-fit spark plug tube as follows:
a. Remove old liquid gasket adhering to cylinder head mounting hole.
b. Apply 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.
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 liquid gasket protruding onto cylinder-head upper face.
11. Install spark plug with spark plug wrench (commercial service tool).