TOYOTA CAMRY V20 1986 Service Information

2. REMOVE VALVES
(a) Using SST, compress the valve spring and remove the two
keepers.
SST 09202±70010
(b) Remove the spring retainer, valve spring, valve and spring
seat.
DISASSEMBLY OF CYLINDER HEADS
(See page EM±75)
1 . REMOVE VALVE LIFTERS AND SHIMS
HINT: Arrange the valves, valve springs, spring seats
and spring retainers in correct order.
(c) Using needle±nose pliers, remove the oil seal. HINT: Arrange the valve lifters and shims in correct or-
der.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±84

INSPECTION, CLEANING AND REPAIR OF
CYLINDER HEAD COMPONENTS
1. CLEAN TOP OF PISTONS AND TOP OF BLOCK
(a) Turn the crankshaft and bring each piston to top dead center
(TDC). Using a gasket scraper, remove all the carbon from the
piston top.
(b) Remove all the gasket material from the top of the cylinder block.
(c) Using compressed air, blow carbon and oil from the bolt holes.
CAUTION: Protect your eyes when using high pressure
air.
2. REMOVE GASKET MATERIAL
Using a gasket scraper, remove all the gasket material from the
manifold and cylinder head surface.
NOTICE: Be careful not to scratch the surfaces.
3. CLEAN COMBUSTION CHAMBERS
Using a wire brush, remove all the carbon from the combus-
tion chambers.
NOTICE: Be careful not to scratch the head gasket contact
surface.
4. CLEAN VALVE GUIDE BUSHINGS
Using a valve guide bushing brush and solvent, clean all the
guide bushings.
5. CLEAN CYLINDER HEADS
Using a soft brush and solvent, thoroughly clean cylinder
heads.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±85

6. INSPECT CYLINDER HEADS FOR FLATNESS
Using a precision straight edge and thickness gauge, mea-
sure the surfaces contacting the cylinder block manifolds for
warpage.
Maximum warpage: 0.10 mm (0.0039 in.)
If warpage is greater than maximum, replace the cylinder
head.
7. INSPECT CYLINDER HEAD FOR CRACKS
Using a dye penetrant, check the combustion chamber, in-
take and exhaust ports, head surface and the top of the
head for cracks:
If cracked, replace the cylinder head.
9. INSPECT VALVE STEMS AND GUIDE BUSHINGS
(a) Using a caliper gauge, measure the inside diameter of the
guide bushing.
Bushing inside diameter:
6.010 ± 6.030 mm (0.2366 ± 0.2374 in.) 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.
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±86

(b) Using a micrometer, measure the diameter of the valve
stem.
Valve stem diameter:
Intake 5.970 ± 5.985 mm
(0.2350 ± 0.2356 in.)
Exhaust 5.965 ± 5.980 mm
(0.2348 ± 0.2354 in.)
(c) Subtract the valve stem diameter measurement from
the guide bushing inside diameter measurement.
Standard oil clearance:
Intake 0.025 ± 0.060 mm
(0.0010 ± 0.0024 in.)
Exhaust 0.030 ± 0.065 mm
(0.0012 ± 0.0026 in.)
Maximum oil clearance:
Intake 0.08 mm (0.0031 in.)
Exhaust 0.10 mm (0.0039 in.)
If the clearance is greater than maximum, replace the
valve and guide bushing.
10. IF NECESSARY, REPLACE VALVE GUIDE BUSHINGS
(a) Insert an old valve wrapped with tape into the valve
guide bushing, and break off the valve guide bushing by
hitting it with a hammer.
NOTICE: Be careful not to damage the valve lifter hole.
(c) Using SST and a hammer, tap out the guide bushing.
SST 09201± 70010 (b) Gradually heat the cylinder head to 80 ±100
°C (176
± 212°F).
± ENGINE MECHANICALCylinder Heads (2VZ±FE)EM±87

(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

(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

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

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

(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

(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