Page 1265 of 2389

(e) Select a new guide bushing (STD size or O/S 0.05).
If the bushing bore diameter of the cylinder head is greater
than 11.027 mm (0.4341 in.), machine the bushing bore to
the following dimension:
Rebored cylinder head bushing bore dimension:
11.050 ± 11.077 mm (0.4350 ± 0.4361 in.)
If the bushing bore diameter of the cylinder head is greater
than 11.077 mm (0.4361 in.), replace the cylinder head.
11. 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
°
(f) Gradually heat the cylinder head to 80 ±100°C 076
± 212°F).
(g) Using SST and a hammer, tap in a new guide bushing
until the snap ring makes contact with the cylinder
head.
SST 09201±70010
(h) Using a sharp 6 mm reamer, ream the guide bushing
to obtain the standard specified clearance (See
page EM±86) between the guide bushing and valve
stem. (d) Using a caliper gauge, measure the bushing bore di-
ameter of the cylinder head.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±88
Page 1266 of 2389

(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:
wIf blue appears 360° around the face, the valve is con-
centric. If not, replace the valve.
wIf blue appears 360° around the valve seat, the guide
and face are concentric. If not, resurface the seat.
wCheck 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.) (d) Check the valve overall length.
Standard overall length:
Intake 96.1 mm (3.783 in.)
Exhaust 96.2 mm (3.787 in.)
Minimum overall length:
Intake 95.6 mm (3.754 in.)
Exhaust 95.7 mm (3.768 in.)
If the overall length is less than minimum, replace the
valve. (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.
(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.
12. INSPECT AND CLEAN VALVE SEATS
(a) Using a 455 carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±89
Page 1267 of 2389
13. INSPECT VALVE SPRINGS
(a) Using a steel square, measure the squareness of the valve
spring.
Maximum squareness: 2.0 mm (0.075 in.)
if squareness is greater than maximum, replace the valve
spring.
(b) Using calipers, measure the free length of the valve
spring.
Free length: 42.6 mm (1.677 in.)
If the free length is not as specified, replace the valve
spring. If not, correct the valve seats as follows:
111 If the seating is too high on the valve face, use
30° and 45° cutters to correct the seat.
(d) Hand±lap the valve and valve seat with an abrasive
compound.
After hand±lapping, clean the valve and valve seat. (2) If the seating is too low on the valve face, use
60° and 45° cutters to correct the seat.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±90
Page 1268 of 2389

B. Inspect cam lobes
Using a micrometer, measure the cam lobe height.
Standard cam lobe height:
Intake 39.510 ± 39.610 mm
(1.5555 ± 1.5594 in.)
Exhaust 38.960 ± 39.060 mm
(1.5339 ± 1.5378 in.)
Minimum cam lobe height:
Intake 39.36 mm (1.5496 in.)
Exhaust 38.81 mm (1.5279 in.)
If the cam lobe height is greater than maximum, replace the
camshaft.
C. Inspect camshaft journals
Using a micrometer, measure the journal diameter.
Journal diameter: 26.949 ± 26.965 mm
(1.0610 ± 1.0616 in.)
If the journal diameter is not as specified, check the oil clear-
ance. 14. INSPECT CAMSHAFTS AND BEARINGS
A. Inspect camshaft for runout
(a) Place the camshaft on V±blocks.
(b) Using a dial indicator, measure the circle runout at the cen-
ter journal.
Maximum circle runout: 0.06 mm (0.0024 in.)
If the circle runout is greater than maximum, replace the
camshaft. (c) Using a spring tester, measure the tension of the valve
spring at the specified installed length.
Installed tension:
18.6 ± 21.4 kg (41.0 ± 47.2 1b, 182 ± 210 N)
at 33.8 mm (1.331 in.)
If the installed tension is not as specified, replace the
valve spring.
D. Inspect camshaft bearings
Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and
cylinder head as a set.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±91
Page 1269 of 2389

(e) Remove the bearing caps.
(f) Measure the Plastigage at its widest point.
Standard oil clearance: 0.035 ± 0.072 mm.
(0.0014 ± 0.0028 in.)
Maximum oil clearance: 0.10 mm (0.0039 in.)
If the oil clearance is greater than maximum, replace the
camshaft. If necessary, replace the bearing caps and cylin-
der head as a set.
(g) Completely remove the Plastigage.
G. Inspect camshaft thrust clearance
(a) Install the camshafts.
(See step 4 on pages EM±98)
(b) Using a dial indicator, measure the thrust clearance while
moving the camshaft back and forth.
Standard thrust clearance: 0.030 ± 0.080 mm
(0.0012 ± 0.0031 in.)
Maximum thrust clearance: 0.12 mm (0.0047 in.)
If the thrust clearance is greater than maximum, replace the
camshaft. If necessary, replace the bearing caps and cylin-
der head as a set. E. Inspect camshaft gear spring
Using calipers, measure the free distance between the
spring end.
Free distance: 18.2 ± 18.8 mm (0.712 ± 0.740 in.)
If the free distance is not as specified, replace the gear
spring.
F. Inspect camshaft journal oil clearance
(a) Clean the bearing caps and camshaft journals.
(b) Place the camshafts on the cylinder head.
(c) Lay a strip of Plastigage across each of the camshaft jour-
nals.
(c) Install the bearing caps.
(See step 4 on pages EM±97 to 99)
Torque: 160 kg±cm (12 ft±1b, 16 N±m)
NOTICE: Do not turn the camshaft.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±92
Page 1270 of 2389

(b) Using a caliper gauge, measure the lifter bore diameter of
the cylinder head.
Lifter bore diameter: 28.000 ± 28.021 mm
(1.1024 ± 1.1032 in.)
(c) Subtract the lifter diameter measurement from the lifter
bore diameter measurement.
Standard oil clearance: 0.015 ± 0.046 mm
(0.0005 ± 0.0018 in.)
Maximum oil clearance: 0.07 mm (0.0028 in.)
If the oil clearance is greater than maximum, replace the
lifter. If necessary, replace the cylinder head.
16. INSPECT INTAKE, EXHAUST MANIFOLDS AND AIR
INTAKE CHAMBER
Using a precision straight edge and feeler gauge, measure
the surface contacting the cylinder head, intake manifold or
air intake chamber for warpage.
Maximum warpage:
Intake manifold 0.10 mm (0.0039 in.)
Exhaust manifold 1.00 mm (0.0394 in.)
Air intake chamber 0.10 mm (0.0039 in.)
If warpage is greater than maximum, replace the manifold. H. Inspect camshaft gear backlash
(a) Install the camshafts without installing the exhaust cam-
shaft sub±gear.
(See step 4 on pages EM±96 to 99)
(b) Using a dial indicator, measure the backlash.
Standard backlash: 0.020 ± 0.200 mm
(0.0008 ± 0.0079 in.)
Maximum backlash: 0.30 mm (0.0188 in.)
If the backlash is greater than maximum, replace the cam-
shafts.
15. INSPECT VALVE LIFTERS AND LIFTER BORES
(a) Using a micrometer, measure the lifter diameter.
Lifter diameter: 27.975 ± 27.985 mm
(1.1014 ± 1.1018 in.)
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±93
Page 1271 of 2389
1. INSTALL SPARK PLUG TUBES
HINT: When using a new cylinder head, spark plug tubes
must be installed.
Using a press, in a new spark plug tube until there is
45.5±45.9 mm (1.791±1.807 in.) protruding from the cam-
shaft bearing cap installation surface of the cylinder head.
NOTICE: Avoid. pressing a new spark plug tube in too far
by measuring the amount of protrusion while
pressing.
2. INSTALL VALVES
(a) Using SST, push in a new oil seal.
SST 09201±41020
ASSEMBLY OF CYLINDER HEADS
(See page EM±75)
HINT:
wThoroughly clean all parts to be assembled.
wBefore installing the parts, apply new engine oil to all
sliding and rotating surfaces.
wReplace all gaskets and oil seals with new ones.
(c) Using SST, compress the valve spring and place the
two keepers around the valve stem.
SST 09202±70010 (b) Install the following parts:
(1) Valve
(2) Spring seat
(3) Valve spring
(4) Spring retainer
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±94
Page 1272 of 2389
(c) Using a plastic±faced hammer, lightly tap the valve
stern tip to assure proper fit.
3. INSTALL VALVE LIFTERS AND SHIMS
Check the valve lifter rotates smoothly by hand.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±95