Toyota 4A-FE Repair Manual page 56

EM-72 ENGINE MECHANICAL - Cylinder Head (4A-FE)
EM0254 EM0180
EM0181
Length
EM2534
7. INSPECT AND GRIND VALVES
(a) Grind the valve enough to remove pits and carbon.
~b)
Check that the valve is ground to the correct valve
face
angle.
Valve face angle: 44.5°
(c) Check the valve head margin thickness .
Standard margin thickness:
Intake 1.05 - 1.45 mm (0.0413 - 0.0571 in.)
Exhaust 1.19 - 1.59 mm (0.0469 - 0.0626 in.)
Minimum margin thickness: 0.5 mm (0.020 in.)
It the margin thickness is less than minimum, replace the
valve.
(d)
Check the valve overall length.
Standard overall length:
Intake 91.45 mm (3.6004 in.)
Exhaust 91.90 mm (3.6181 in.)
Minimum overall length:
Intake 90.96 mm (3.5807 in.)
Exhaust 91.40 mm (3.5984 in.)
If the overall length is less than minimum, replace the
valve.
(e)
Check the surface
of
the valve stem tip for wear.
If the valve stem tip is worn, re surf ace the tip with a
grinder or replace the valve.
NOTICE: Do not grind off more than minimum.
8. INSPECT AND CLEAN VALVE SEATS
(a)
Using a 45° carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.