Disassembly and Assembly

Disassembly and Assembly

CAUTION:
^ When installing camshafts, chain tensioners, oil seals, or other sliding parts, lubricate contacting surface with new engine oil.
^ Apply new engine oil to threads and seat surface when installing cylinder head, camshaft sprocket, crankshaft pulley, and camshaft bracket.
^ Attach tags to valve lifters so as not to mix them up.

DISASSEMBLY
1. Remove spark plug with spark plug wrench.
2. Remove spark plug tube, as necessary.
^ Using a pair of pliers, pull spark plug tube out of cylinder head.

CAUTION:
^ Take care not to damage cylinder head.
^ Once spark plug tube is removed, it will be deformed and cannot be reused. Do not remove it unless absolutely necessary.

3. Remove adjusting shim and valve lifter.
^ Confirm installation point. Keep parts in an organized way to avoid.





4. Remove valve collet.
^ Compress valve spring with valve spring compressor. Remove valve collet with magnet driver.

5. Remove valve spring retainer and valve spring.

CAUTION: Do not remove valve spring seat from valve spring.

6. Push valve stem to combustion chamber side, and remove valve.
^ Inspect valve guide clearance before removal. Refer to "VALVE GUIDE CLEARANCE".
^ Confirm installation point. Keep parts in an organized way to avoid.





7. Remove valve oil seal with valve oil seal puller.
8. When valve seat must be replaced, refer to "VALVE SEAT REPLACEMENT".
9. When valve guide must be replaced, refer to "VALVE GUIDE REPLACEMENT".

ASSEMBLY
1. Install valve guide. Refer to "VALVE GUIDE REPLACEMENT".
2. Install valve seat. Refer to "VALVE SEAT REPLACEMENT".





3. Install valve oil seal.
^ Install with valve oil seal drift to match dimension in illustration.

4. Install valve.
^ Install larger diameter to intake side.





5. Install valve spring.
^ 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. Install valve collet with magnet hand.
^ Tap stem edge lightly with plastic hammer after installation to check its installed condition.

8. Install valve lifter.





9. Install spark plug tube.
^ Press-fit spark plug tube following procedure below.

a. Remove old liquid gasket adhering to cylinder-head mounting hole.
b. Apply liquid gasket to area within approximately 12 mm (0.47 inch) from edge of spark plug tube press-fit side.
^ Use Genuine liquid gasket or equivalent.

c. Using a drift, press-fit spark plug tube so that its height "H" in the figure is as specified.
Standard press-fit height "H" 38.4 - 39.4 mm (1.512 - 1.551 inch)

CAUTION:
^ When press-fitting spark plug tube, take care not to deform it.
^ After press-fitting, wipe off liquid gasket protruding onto cylinder-head upper face.

10. Install spark plug with spark plug wrench.