P03849
Overall Length
EM0255
P04415
−
ENGINE MECHANICAL
CYLINDER HEAD
EM
−
43
1996 LAND CRUISER (RM451U)
(d)
Check the valve overall length.
Standard overall length:
Intake
98.4 mm (3.874 in.)
Exhaust
97.4 mm (3.854 in.)
Minimum overall length:
Intake
97.9 mm (3.854 in.)
Exhaust
97.4 mm (3.835 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.
7.
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 the following:
S
If blue appears 360
°
around the face, the valve is
concentric. If not, replace the valve.
S
If blue appears 360
°
around the valve seat, the
guide and face are concentric. If not, resurface the
seat.
S
Check that the seat contact is in the middle of the
valve face with these width:
Intake
1.2
−
1.6 mm (0.047
−
0.063 in.)
Exhaust
1.0
−
1.4 mm (0.039
−
0.055 in.)
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Version 1.00 - 12/21/2010