Toyota 1HD-FT Repair Manual page 61

EG-48
ENGINE - ENGINE MECHANICAL
nr
5. INSPECT VALVE STEMS AND GUIDE 8USHINGS
(a) Using a caliper gauge, measure the inside diameter of
the guide bushing.
Bushing inside diameter:
7.010 - 7.030 mm (0.2780 - 0.2768 in.)
+
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(b) Using a micrometer. measure the diameter of the
valve stem.
Valve ,tern diameter:
Intaka
6.970 - 6.985 mm (0.2744 - 0.2750 in.)
Exh8USt
6.960 - 6.975 mm 10.2740 - 0.2746 in.)
(e) Subtract the valve stem diameter measurement from
the guide bushing inside diameter measurement.
Standard oil cl•• rance:
Intake
0.025 - 0.060
mm
(0.0010 - 0.0024 In.)
Exhaust
0.035 - 0.070 mm (0.0014. - 0.0028 in.'
Meximum oil cl••rance:
lntak.
0.08
mm
(0.003'
in.)
Exhaust
0.10
mm
(0.0039 In.)
If the clearance is greater than maximum. replace the
valve and cylinder head.
[M01'1
6. INSPECT AND GRIND VALVES
(a) Check the valve face for wear.
If the valve face is worn. replace the valve.
(b) Check the valve head margin thickness.
Standard margin thickness:
1.00 mm (0.0394 in.)
Minimum margin thickness:
0.83 mm (0.0327 in.)
If the margin thickness is less than minimum. replace
the valve.