Toyota T100 1996 Service Manual page 765

EM−42
Width
1996 TOYOTA T100 (RM449U)
ENGINE MECHANICAL (3RZ−FE)
Overall Length
P03849
EM0255
A03806
P04415
30°
45°
1.0 − 1.4 mm
Z11441
− CYLINDER HEAD
(d) Check the valve overall length.
Standard overall length:
Intake
103.45 mm (4.0728 in.)
Exhaust
103.60 mm (4.0787 in.)
Minimum overall length:
Intake
102.95 mm (4.0531 in.)
Exhaust
103.10 mm (4.0590 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.
12. INSPECT AND CLEAN VALVE SEATS
(a) Using a 45° carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.
(b) Check the valve seating position.
Apply a light coat of prussian blue (or white lead) to the
valve face. Lightly press the valve against the seat. Do not
rotate valve.
(c) Check the valve face and seat for these:
If blue appears 360° around the face, the valve is
S
concentric. If not, replace the valve.
If blue appears 360° around the valve seat, the
S
guide and face are concentric. If not, resurface the
seat.
Check that the seat contact is in the middle of the
S
valve face with these width:
1.0 − 1.4 mm (0.039 − 0.055 in.)
If not, correct the valve seats as follows:
Intake:
S
If the seating is too high on the valve face, use 30°
and 45° cutters to correct the seat.