Valve guide reamer 4 mm 016 in 9089004113 YM04113

3. Eliminate:

• carbon deposits

(from the valve face and valve seat)

Pitting/wear ^ Grind the valve face.

Mushroom shape or diameter larger than the body of the valve stem ^ Replace the valve.

5. Measure: • valve margin thickness ® Out of specification ^ Replace the valve.

Valve margin thickness 0.6 - 0.8 mm (0.0236 - 0.0315 in) <Limit>: 0.5 mm (0.02 in)

6. Measure: • valve stem runout Out of specification

Replace the valve.

►When installing a new valve, always replace the valve guide.

► If the valve is removed or replaced, always replace the oil seal.

Valve stem runout

CHECKING THE VALVE SEATS

The following procedure applies to all of the valves and valve seats.

1. Eliminate:

• carbon deposits

(from the valve face and valve seat)

Pitting/wear ^ Replace the cylinder head.

3. Measure: • valve seat width (a) Out of specification head.

Replace the cylinder

Valve seat width 0.9 - 1.1 mm (0.0354 - 0.0433 in) <Limit>: 1.6 mm (0.06 in)

a. Apply Mechanic's blueing dye (Dykem) ® onto the valve face.

b. Install the valve into the cylinder head.

c. Press the valve through the valve guide and onto the valve seat to make a clear impression.

d. Measure the valve seat width.

EAS00240

Where the valve seat and valve face contacted one another, the blueing will have been removed.

After replacing the cylinder head or replacing the valve and valve guide, the valve seat and valve face should be lapped.

a. Apply a coarse lapping compound ® to the valve face.

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