Toyota 1 MZ–FE Manual page 86

EG2–86
1MZ–FE ENGINE – ENGINE MECHANICAL
(c) Check the valve head margin thickness.
Standard margin thickness:
1.0 mm (0.039 in.)
Minimum margin thickness:
0.5 mm (0.020 in.)
If the margin thickness is less than minimum, replace
the valve.
(d) Check the valve overall length.
Standard overall length:
Intake
95.45 mm (3.5779 in.)
Exhaust
95.40 mm (3.7559 in.)
Minimum overall length:
Intake
94.95 mm (3.7382 in.)
Exhaust
94.90 mm (3.7362 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, resurface 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 452 carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.