EM0DB±01
A02703
A02715
SST
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±39
1393 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
1. REMOVE WATER OUTLET WITH WATER BYPASS
HOSE
Remove the 2 nuts, bolt, water outlet and gasket.
2. REMOVE ENGINE HANGER
3. REMOVE CAMSHAFT POSITION SENSOR
4. REMOVE ECT SENSOR
5. REMOVE VALVE LIFTERS AND SHIMS
HINT:
Store the valve lifters and shims in correct order.
6. REMOVE VALVES
(a) Using SST, compress the valve spring and remove the 2
keepers.
SST 09202±70020 (09202±00010)
(b) Remove the spring retainer, valve spring, valve and
spring seat.
HINT:
Store the valves, valve springs, spring seats and spring retain-
ers in correct order.
(c) Using needle±nose pliers, remove the oil seal.
EM2534
Overall
Length
EM0255
A02709
45° Carbide Cutter
Z00373
Width
P03966
Width 45°
15°
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±43
1397 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(d) Check the valve overall length.
Standard overall length:
Intake98.29 ± 98.79 mm (3.8697 ± 3.8894 in.)
Exhaust98.84 ± 99.34 mm (3.8913 ± 3.9110 in.)
Minimum overall length:
Intake98.19 mm (3.8657 in.)
Exhaust98.74 mm (3.8874 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 the minimum overall length.
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 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:
If not, correct the valve seats as follows:
Intake1.0 ± 1.4 mm (0.039 ± 0.055 in.)
Exhaust1.2 ± 1.6 mm (0.047 ± 0.063 in.)
(1) If the seating is too high on the valve face, use 15°
and 45° cutters to correct the seat.
