Toyota 4A-FE Repair Manual page 54

EM-70
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ENGINE.MECHANICAL - Cylinder Head (4A-FE)
EM4192
EM4190
5. INSPECT VALVE STEMS AND GUIDE BUSHINGS
(a) Using a caliper gauge, measure the inside diameter of
the guide bushing.
Bushing inside diameter:
6.01 - 6.03
mm
(0.2366 - 0.2374
in.)
(b) Using
a
micrometer, measure the diameter of the
valve stem.
Valve
stem
diameter:
Intake 5.970 - 0.2356 mm
(0.2350 - 0.2356 in.)
Exhaust
5.965 - 5.980
mm
(0.2348 - 0.2354 in.)
(c)
Subtract the valve stem diameter measurement from
the guide bushing inside diameter measurement.
Standard oil clearance:
Intake 0.025 - 0.060 mm
(0.0010 - 0.0024 in.)
Exhaust 0.030 - 0.065 mm
(0.0012 - 0.0026 in.)
Maximum oil clearance:
Intake 0.08
mm
(0.0031 in.)
Exhaust 0.10 mm (0.0039 in.)
If the clearance is greater than maximum, replace the valve
end guide bushing.
6. IF NECESSARY, REPLACE VALVE GUIDE BUSHINGS
(a) Gradually heat the cylinder head to 80 - 100°C (176
- 212°F).
(b) Using SST and a hammer, tap out the guide bushing.
SST 09201- 70010