Disassembly and Assembly

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DISASSEMBLY
1. Remove spark plug with spark plug wrench (commercial service tool).
2. Remove adjusting shim and 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 magnetic hand.

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

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

CAUTION: Do not 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 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 pair of 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 seal as follows:
a. Apply new engine oil on valve oil seal joint and seal lip.





b. Install with valve oil seal drift (SST) to match dimension in the figure.
4. Install valve.
^ Install in the original position.

NOTE: Larger diameter valves are for intake side.





5. Install valve spring (with valve spring seat).
^ Install smaller pitch (valve spring seat side) to cylinder head side.
6. Install valve spring retainer.





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

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

^ Tap stem edge lightly with plastic hammer after installation to check its installed condition.
8. Install valve lifter and adjusting shim.
^ Install in the original position.
9. Install spark plug tube as follows:
^ Press-fit spark plug tube following procedure below.

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: 38.4 - 39.4 mm (1.512 - 1.551 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.

10. Install spark plug with spark plug wrench (commercial service tool).