Toyota 3S-GE Repair Manual page 109

EG-95
ENGINE — ENGINE MECHANICAL
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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 the minimum length.
INSPECT AND CLEAN VALVE SEATS
Using a 45° carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.
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.
Check the valve face and seat for the following:
I If blue appears 360° around the face, the valve is
concentric. If not, replace the valve.
I If blue appears 360° around the valve seat, the
guide and face are concentric. If not. resurface
the seat.
I Check that the seat contact is in the middle of the
valve face with the following width:
1.0 — 1.4 mm (0.039 — 0.055 in.)
If not, correct the valve seats as follows:
(1) If the seating is too high on the valve face, use
30° and 45° cutters to correct the seat.
(2) If the seating is too low on the valve face, use
75° and 45° cutters to correct the seat.