Page 2705 of 4592
P12797
SST
P12590
P12816
Recessed Head Bolt
8 mm Hexagon Wrench
Front EM±40
± ENGINE MECHANICAL (1MZ±FE)CYLINDER HEAD
1326 Author: Date:
(b) Using SST, turn the sub±gear counterclockwise, and re-
move the service bolt.
SST 09960±10010 (09962±01000, 09963±00500)
(c) Using snap ring pliers, remove the snap ring.
(d) Remove the wave washer, camshaft sub±gear, and cam-
shaft gear spring.
HINT:
Arrange the camshaft sub±gears and gear springs (RH and LH
side).
34. REMOVE CYLINDER HEADS
(a) Using an 8 mm hexagon wrench, remove the cylinder
head (recessed head) bolt on each cylinder head, then re-
peat for the other side, as shown.
Page 2706 of 4592
P12735
12 Pointed Head Bolt
Front1 23
45
67
8
1
23 4
5 6
78
P12424
± ENGINE MECHANICAL (1MZ±FE)CYLINDER HEAD
EM±41
1327 Author: Date:
(b) Uniformly loosen and remove the 8 cylinder head (12
pointed head) bolts on each cylinder head, in several
passes, in the sequence shown, then repeat for the other
side, as shown. Remove the 16 cylinder head bolts and
plate washers.
NOTICE:
Head warpage or cracking could result from removing
bolts in an incorrect order.
(c) Lift the cylinder head from the dowels on the cylinder
block and place the 2 cylinder heads on wooden blocks
on a bench.
HINT:
If the cylinder head is difficult to lift off, pry between the cylinder
head and cylinder block with a screwdriver.
NOTICE:
Be careful not to damage the contact surfaces of the cylin-
der head and cylinder block.
Page 2707 of 4592
EM04T±03
P12683
P12476
SST
P12686
P12720
Magnetic Finger EM±42
± ENGINE MECHANICAL (1MZ±FE)CYLINDER HEAD
1328 Author: Date:
DISASSEMBLY
1. REMOVE VALVE LIFTERS AND SHIMS
HINT:
Arrange the valve lifters and shims in the correct order.
2. 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 and valve.
(c) Using needle±nose pliers, remove the oil seal.
(d) Using compressed air and a magnetic finger, remove the
spring seat by blowing air.
HINT:
Arrange the valves, valve springs, spring seats and spring re-
tainers in the correct order.
Page 2708 of 4592

EM0YP±01
P12689
P12492
P12700
P12701
P12703
± ENGINE MECHANICAL (1MZ±FE)CYLINDER HEAD
EM±43
1329 Author: Date:
INSPECTION
1. CLEAN TOP SURFACES OF PISTONS AND
CYLINDER BLOCK
(a) Turn the crankshaft, and bring each piston to top dead
center (TDC). Using a gasket scraper, remove all the car-
bon from the piston top surface.
(b) Using a gasket scraper, remove all the gasket material
from the cylinder block surface.
(c) Using compressed air, blow carbon and oil from the bolt
holes.
CAUTION:
Protect your eyes when using high pressure compressed
air.
2. REMOVE GASKET MATERIAL
Using a gasket scraper, remove all the gasket material from the
cylinder block contact surface.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
face.
3. CLEAN COMBUSTION CHAMBERS
Using a wire brush, remove all the carbon from the combustion
chambers.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
face.
4. CLEAN CYLINDER HEADS
Using a soft brush and solvent, thoroughly clean the cylinder
head.
Page 2709 of 4592
P12755
P12733
P12702
EM0580
EM±44
± ENGINE MECHANICAL (1MZ±FE)CYLINDER HEAD
1330 Author: Date:
5. CLEAN VALVE GUIDE BUSHINGS
Using a valve guide bushing brush and solvent, clean all the
guide bushings.
6. INSPECT FOR FLATNESS
Using a precision straight edge and feeler gauge, measure the
surfaces contacting the cylinder block and the manifolds for
warpage.
Maximum warpage: 0.10 mm (0.0039 in.)
If warpage is greater than maximum, replace the cylinder head.
7. INSPECT FOR CRACKS
Using a dye penetrant, check the combustion chamber, intake
ports, exhaust ports and cylinder block surface for cracks.
If cracked, replace the cylinder head.
8. CLEAN VALVES
(a) Using a gasket scraper, chip off any carbon from the valve
head.
(b) Using a wire brush, thoroughly clean the valve.
Page 2710 of 4592

P12754
Z00052
Z00054
44.5°
EM0181
Margin Thickness
± ENGINE MECHANICAL (1MZ±FE)CYLINDER HEAD
EM±45
1331 Author: Date:
9. INSPECT VALVE STEMS AND GUIDE BUSHINGS
(a) Using a caliper gauge, measure the inside diameter of the
guide bushing.
Bushing inside diameter:
5.510 ± 5.530 mm (0.2169 ± 0.2177 in.)
(b) Using a micrometer, measure the diameter of the valve
stem.
Valve stem diameter:
Intake5.470 ± 5.485 mm (0.2154 ± 0.2159 in.)
Exhaust5.465 ± 5.480 mm (0.2152 ± 0.2157 in.)
(c) Subtract the valve stem diameter measurement from the
guide bushing guide bushing inside diameter measure-
ment.
Standard oil clearance:
Intake0.025 ± 0.060 mm (0.0010 ± 0.0024 in.)
Exhaust0.030 ± 0.065 mm (0.0012 ± 0.0026 in.)
Maximum oil clearance:
Intake0.08 mm (0.0031 in.)
Exhaust0.10 mm (0.0039 in.)
If the clearance is greater than maximum, replace the valve and
guide bushing.
10. INSPECT AND GRIND VALVES
(a) Grind the valve enough to remove pits and carbon.
(b) Check that the valve is ground to the correct valve face
angle.
Valve face angle: 44.5°
(c) Check the valve head margin thickness.
Standard margin thickness: 1.0 mm (0.039 in.)
Minimum margin thickness: 0.5 mm (0.020 in.)
If the margin thickness is less than minimum, replace the valve.
Page 2711 of 4592

EM2534
Overall Length
EM0255
P12704
P12729
Width
Z03988
45°
1.0 ± 1.4 mm30° EM±46
± ENGINE MECHANICAL (1MZ±FE)CYLINDER HEAD
1332 Author: Date:
(d) Check the valve overall length.
Standard overall length:
Intake95.45 mm (3.5779 in.)
Exhaust95.40 mm (3.7559 in.)
Minimum overall length:
Intake94.95 mm (3.7382 in.)
Exhaust94.90 mm (3.7362 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.
11. 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:
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:
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.
Page 2712 of 4592

Z03989
45°
1.0 ± 1.4 mm75°
P12705
EM0988
Deviation
EM0801
EM0281
± ENGINE MECHANICAL (1MZ±FE)CYLINDER HEAD
EM±47
1333 Author: Date:
(2) If the seating is too low on the valve face, use 75°
and 45° cutters to correct the seat.
(d) Hand±lap the valve and valve seat with an abrasive com-
pound.
(e) After hand±lapping, clean the valve and valve seat.
12. INSPECT VALVE SPRINGS
(a) Using a steel square, measure the deviation of the valve
spring.
Maximum deviation: 2.0 mm (0.079 in.)
If the deviation is greater than maximum, replace the valve
spring.
(b) Using vernier calipers, measure the free length of the
valve spring.
Free length: 45.50 mm (1.7913 in.)
If the free length is not as specified, replace the valve spring.
(c) Using a spring tester, measure the tension of the valve
spring at the specified installed length.
Installed tension:
186 ± 206 N (19.0 ± 21.0 kgf, 41.9 ± 46.3 lbf)
at 33.8 mm (1.331 in.)
If the installed tension is not as specified, replace the valve
spring.