## Cylinder Head

#### Valve, Spring, Guide, Tappet and Adjust Shim Inspection

6-22

Valve Stem Outside Diameter Measurement

1. Measure the valve stem diameter at three points. If the measured value is less than the specified limit, the valve and the valve guide must be replaced as a set.

Valve stem outside diameter:

Intake valve:

Standard:

5.959 – 5.977 mm (0.2346 – 0.2353 in.)

Limit:

5.945 mm (0.2341 in.)

Exhaust valve:

Standard:

5.954 – 5.972 mm (0.2344 – 0.2351 in.)

Limit:

5.940 mm (0.2339 in.)

1. Measure the valve thickness.

   If the measured value is less than the specified limit, the valve and the valve guide must be replaced as a set.

Intake and exhaust valve thickness:

Standard:

1.2 – 1.4 mm (0.05 – 0.06 in.)

Limit:

1.0 mm (0.04 in.)

Valve Spring Free Height Measurement

1. Use a vernier caliper to measure the valve spring free height.

   If the measured value is less than the specified limit, the valve spring must be replaced.

Valve spring free height:

Standard:

44.63 mm (1.757 in.)

Limit:

44.13 mm (1.737 in.)

Valve Spring Inclination Measurement

1. Use a surface plate and a square to measure the valve spring inclination.

   If the measured value exceeds the specified limit, the valve spring must be replaced.

Valve spring inclination:

Standard:

1.01 mm (0.04 in.)

Limit:

2.2 mm (0.09 in.)

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