Toyota Supra 1990 Manual page 79

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ENGINE MECHANICAL - Cylinder Head

Hand-lap the valve and valve seat with an abrasive

13. INSPECT VALVE SPRINGS

Using a steel square, measure the squareness of the

valve springs.

Maximum squareness:

1.5 mm (0.059 in.)

If squareness is greater than maximum, replace the valve

Using calipers, measure the free length of the valve

Free length:

41.64 mm (1.6394 in.)

If the free length is not within specification, replace the

valve spring.

Using a spring tester, measure the tension of the valve

spring at the specified installed length.

Installed tension:

16.0 kg (35 Ib, 157 N) at 35.0 mm (1.378 in.)

If the installed tension is not as specified, replace the valve

14. INSPECT CAMSHAFT AND BEARING CAPS

Place the camshaft on V-blocks and, using a dial

gauge, measure the circle runout at the center journal.

Maximum circle runout:

0.03 mm (0.0012 in.)

If the circle runout is greater than maximum, replace the

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