EMS/Engine Mechanical 1997 Supplement — Inspect and Clean Valve Seats, page 10

EM-38
ENGINE MECHANICAL (2JZ-GTE) - CYLINDER HEAD

Overall Length

EM2534

(d) Check the valve overall length.
Standard overall length:
Intake 98.29 - 98.79 mm (3.8697 - 3.8894 in.)
Exhaust 98.84 - 99.34 mm (3.8913 - 3.9110 in.)
Minimum overall length:
Intake 98.19 mm (3.8657 in.)
Exhaust 98.74 mm (3.8874 in.)
If the overall length is less than minimum, replace the valve.

EM0255

(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 the minimum overall length.

45°
Carbide
Cutter

P02127

11. INSPECT AND CLEAN VALVE SEATS
(a) Using a 45° carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.

Width

EM0183 EM0635
Z00373

(b) Check the valve seating position.
Apply a thin coat of prussian blue (or white lead) to the
valve face. Lightly press the valve against the seat. Do not
rotate the valve.
(c) Check the valve face and seat for the following:
• If blue appears 360° around the face, the valve is
concentric. If not, replace the valve.
• If blue appears 360° around the valve seat, the
guide and face are concentric. If not, resurface the
seat.
• Check that the seat contact is in the middle of the
valve face with the following width:
Intake 1.0 - 1.4 mm (0.039 - 0.055 in.)
Exhaust 1.2 - 1.6 mm (0.047 - 0.063 in.)
If not, correct the valve seats as follows:
• If the seating is too high on the valve face, use 15°
and 45° cutters to correct the seat.

45°
15°

Width

P03966

1997 SUPRA (RM502U)

Author : Date : 1143