## Cylinder Head

#### Valve, Spring, Guide, Tappet and Adjust Shim Inspection (cont'd)

6-23

Valve Spring Tension Measurement

1. Use a spring tester to measure the valve spring tension. If the measured value is less than the specified limit, the valve spring must be replaced.

Valve spring tension:

Compressed height:

33.3 mm (1.31 in.)

Standard:

160 N (16.3 kgf, 73 lbf)

Valve Guide Measurement

1. Measure the valve stem outside diameter. Refer to the item ''Valve Stem Outside Diameter''. Use a caliper calibrator or a telescoping gauge to measure the valve guide inside diameter. If the measured values exceed the specified limit, the valve and the valve guide must be replaced as a set.

Valve stem clearance:

Intake valve:

Standard:

0.023 – 0.056 mm (0.001 – 0.002 in.)

Limit:

0.080 mm (0.0031 in.)

Exhaust valve:

Standard:

0.028 – 0.061 mm (0.001 – 0.002 in.)

Limit:

0.095 mm (0.0037 in.)

Tappet and Adjust Shim Inspection

1. Visually inspect the shim camshaft contact surfaces for pitting, cracking and other abnormal conditions. The tappet must be replaced if any of these conditions are present.

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