Toyota Supra 1990 Manual page 76

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ENGINE MECHANICAL - Cylinder Head

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Both intake and exhaust

Bushing bore mm (in.)

Bushing size

11.000 - 11.027

(0.4331 - 0.4341)

Use O/S 0.05

10. IF NECESSARY, REPLACE VALVE GUIDE BUSHINGS

Insert an old valve wrapped with tape into the valve

guide bushing and break off the valve guide bushing

by hitting it with a hammer.

Be careful not to damage the lifter hole.

Gradually heat the cylinder head to approx. 90°C

Using SST and hammer, drive out valve guide bushing.

SST 09201-70010

Using a caliper gauge, measure the valve guide bore

of the cylinder head.

Select a new valve guide bushing.

If the valve guide bushing bore of the cylinder head is more

than 11.027 mm (0.4341 in.). machine the bore to the fol-

lowing dimensions.

Rebored valve guide bushing bore dimension:

11.077 mm (0.4350 - 0.4361 in.)

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