1987 TOYOTA CELICA Service Repair Manual

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ENGINE MECHANICAL - Cylinder Head
EM-47
INSPECT CYLINDER HEAD FOR CRACKS
Using a dye penetrant, check the combustion chamber,
intake and-exhaust ports, head surface and the top of the
head for cracks.
if cracked, replace the head. 8.
9. CLEAN VALVES
(a) Use a gasket scraper to chip any carbon from the
valve head.
(b) Using a wire brush, thoroughly clean the valve.
INSPECT VALVE STEMS AND GUIDE BUSHINGS
(a) Using a caliper gauge, measure the inside diameter of
the valve guide.
Guide inside diameter:
6.010 - 6.030 mm
(0.2366 - 0.2374 in.)
EM2586 EM2931
(b) Using a micrometer, measure the diameter of the
valve stem.
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 valve guide bushing inside diameter measure-
ment.
Standard stem 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 stem 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 busing.

EM-48 ENGINE MECHANICAL h Cylinder Head
Both intake and exhaust
Bushing bore mm (in.)
11.000 - 11.027
(0.433 1 - 0.4341 I Bushing size
.’ Use STD
Over 11.027
(0.434 1) Use O/S 0.05 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.
CAUTION: Be careful.not to damage the lifter hole.
(b) Gradu
9O”C(’ .
ally heat the cylinder head to approx.
194OF).
(c) Using SST and hammer, drive out valve guide bush-
ing.
SST 09201-70010
(d) Using a caliper gauge, measure the valve guide bore
of the cylinder head.
(e) Select a new valve guide bushing.
If the valve guide bushing bore of the cylinder head is
more than 11.027 mm (0.4341 in.), machine the bore to
the following dimensions.
Rebored valve guide bushing bore dimension:
11.050 - 11.077 mm (0.4350 - 0.4381 in.1

ENGINE MECHANICAL - Cylinder Head
SST
Snap Ring
EM063
82
(f) $u;ily heat the cylinder head to approti; “90°C
0
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(g) Using SST and hammer, drive in a new valve guide
bushing until the snap ring makes contact with the
cylinder head.
SST 09201-70010
Overall Length
II
[r
_-
2606.
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(h) Using a sharp 6 mm (0.23 in.) reamer, ream the valve
guide bushing to obtain standard specified clearance
(See page EM-471 between the.valve guide bushing
and new .valve.
11. INSPECT AND GRIND VALVES
(a) Grind the valve only enough to remove pits and car-
bon.
(b) Check that the valve are ground to the correct valve
face angle.
Valve face angle: 44.5”
(c) Check the valve head margin thickness.
Standard margin thickness: 1.3 mm (0.051 in.)
Minimum margin thickness: 0.5 mm (0.020 in.)
If the valve head margin thickness is less than minimum,
replace the valve.
(d) Check the valve overall length.
Standard overall length: 98.15 mm (3.8842 in.)
Minimum overall length: 97.75 mm (3.8484 in.1
If the valve overall length is less than minimum, replace
the valve.

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EM-50 ENGINE MECHANICAL - Cylinder Head
1 (e) Check the’surface of the valve stem tip for wear.
If the valve stem tip is worn, regrind it with grinder or re-
place the valve if necessary.
CAUTION: D6 not grind off more than minimum over-
all length (See page EM-49).
12.
INSPECT AND CLEAN VALVE SEATS
(a) Using a 45” carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.
EM3026
(b) Check the valve seating position.
Apply a thin coat of prussian blue (or white lead) to
the valve face. Install the valve. Lightly press the
valve against the seat. Do not rotate the valve.
(c) Check the valve face and seat for the following:
0 If blue appears 360” around the face, the valve is
concentric. If not, replace the valve.
0 If blue appears 360” around the valve seat, the
guide and seat are concentric.
If not, resurface the seat.
0 Check that the seat contact is on the middle of the
valve face with the following width.
1.0 - 1.4 mm (0.039 - 0.055 in.1
If not, correct the valve seat as follows:
0 If seating is too high on the valve face use 30” and
45” cutters to correct the seat.
l If seating is too low on the valve face, use 60°. and
45” cutters to correct the seat.

ENGINE MECHANICAL -, Cylinder Head
EM-5J
Squareness -+- (d) Hand-lap the valve and valve seat with an abrasive
compound.
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13. INSPECT VALVE SPRINGS
(a) Using a steel square, measure the squareness of the
valve springs.
Maximum. squareness: 1.5 mm (0.059 in.)
If squareness .is greater than maximum, replace the valve
spring.
(b) Using calipers, measure the free length of the valve
spring.
Free length : 41.64 mm (1.6394 in.)
If the free length is not within specification, replace the
valve spring.
(c) Using a spring tester, measure the tension of the
valve spring at the specified installed length.
Installed tension :
16.0 kg (35 lb, 157 N) at 35.0 mm (1.378 in.)
If the installed tension is not as specified, replace the valve
spring.
14. INSPECT CAMSHAFT AND BEARING CAPS
(a) Place the camshaft on V-blocks and, using a dial
gauge, measure the circle runout at the center jour-
nal.
Maximum circle runout: 0.03 mm (0.0012 in.)
If the circle runout is greater than maximum, replace the
camshaft.

EM-52
: ENGINE MECHANICAL - Cylinder Head
7614352 (b) Using a micrometer, measure the cam lobe height,
Standard cam lobe height:
Intake
7M-GE MA 38.38 mm (I 6102 in.1
.MS 38.18 mm (I 6024 in.1
7M-GTE 38.36 mm (1.6098 In.)
Exhaust
7M-GE MA 38.38 mm (I .6102 In.)
MS 38.36 mm (1.6098 in.1
7M-GTE 38.36 mm (1.6098 in.) .
Minimum cam lobe height:
Intake-
7M-GE MS 37.86 mm (1.4906 in.)
Others 38.00 mm (1.4981 in.)
Exhaust 38.00 mm (1.4981 in.1
If the cam lobe height is less than minimum, replace the
camshaft.
(c) Using a micrometer, measure the journal diameter.
Standard diameter:
No.1
28.949 - 28.986 mm (I .0810 - 1.0616 in.1
No.2 - No.7
26.888 - 26.976 mm (1.0686 1 1.0620 in.)
If the journal diameter is less than specified, replace the
camshaft.
16. INSPECT CAMSHAFT OIL CLEARANCE
(a) Clean the bearing caps and camshaft journal.
(b) Place the camshaft in the cylinder head.
(4 Lay a strip of plastigage across each journal.
(d) Place the bearing caps with the top of the number on
the cap pointing toward the front and in numerical
order from the front side.
(e) Install and torque the cap bolts gradually in the
sequence shown in the figure.
Torque: 200 kg-cm (14 ft-lb, 20 Nmrn)
NOTE: Do not turn the camshaft while the plastigage is
in place.
(f) Remove the caps and measure the plastigage at its
widest point.

ENGINE MECHANICAL - Cylinder Head
L Et.4294
Standard oil clearance:
No.1 ... ..“..” .._.
0.036 - 0.072 mm (0.0014 - 0.0028 in,)
;
No.2 ii. No.7
0.025 - 0.093 mm (0.0010 - 0.0037 in.)
Maximum.oil clearance: 0.13 mm (0;0061 ‘hi.)
If dlearance is greater than maximum, replace the cylinder
head and/or camshaft.
(g) Clean out the pieces of plastigage from the bearing
caps and journals.
18. INSPECT-CAMSHAFT THRUST CLEARANCE
(a) Clean and install the camshaft and bearing caps.
(b) Using a dial gauge, measure while moving the camshaft back and forth.
Standard thrust clearance’: 0.08 - 0.18 mm
(Q.9031 - 0.0976 in.)
Maximum thrust clearance: 0.30 mm IO.01 18 in.)
If clearance is greater than maximum, replace the
camshaft and/or cylinder head.
17. INSPECT VALVE LIFTER OIL CLEARANCE
.(a) Using a micrometer, measure the diameter of the
valve lifter.
Valve lifter diameter: 27.975 - 27.885 mm
(1.1014 - 1.1018 in.)
(b) Using a dial indicator, measure the inside diameter of
the cylinder head bore.
Lifter bore diameter: 28.000 - 28.021 mm
(1 .1024 - 1 .1032 in.)
(4 Subtract the valve lifter measuremeht from the
cylinder head bore.
Standard oil clearance: 0.015 - 0.048 mm
(0.0008 - 0.0018 in.)
Maximum oil clearance: 0.1 mm (0.004 in.)
If clearance is greater than maximum, replace the cylinder
head and/or valve lifter.
EM2948
EM3570
18. INSPECT INTAKE, EXHAUST MANIFOLD AND
INTAKE CHAMBER
Using a precision straight edge and feeler gauge;-check
the surfaces contacting the cylinder head, or intake
manifold for warpage.
Maximum warpage:
Intake manifold 0.10 mm (0.0039 in.)
Exhaust manifold IM-GE 0.75 mm (0.0295 in.)
7M-GTE 0.60 mm (OiOlQ7 in.)
Intake chamber 0.10 mm (0.0039 in.)
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EM-54
ENGINE MECHANICAL - Cylinder Head
EM295
EMZS’
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EM2954
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EM295! 5
lnwEcTl0~ 0~ INTAKE AIR CONTROL
SYSTEM (‘/M-GE only)
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1.
CHECK AIR CONTROL VALVE OPERATION
With 400 mmHg (15.75 in.Hg, 53.3 kPa) of vacuum
applied to the actuator, check that the control valve
moves smoothly to the fully closed position.
If not adjust with the adjusting screw.
2. CHECK VACUUM TANK BY BLOWING AIR INTO
EACH PIPE
(a) Check that air flows from pipe B to A.
(b) Checkthat air does not flow from pipe A to B.
(c) Apply 500 mmHg (I 9.69 in.Hg, 66.7 kPa) of vacuum
to pipe B and check that there is no change in
vacuum after one minute.
If there is a change, replace the vacuum tank.
3. CHECK VACUUM CIRCUIT CONTINUITY IN THE VSV
BY BLOWING Alti INTO PIPE
(a) Connect the VSV terminals to the battery terminals
as illustrated.
(b) Blow into pipe E and check that air comes out of the
pipe G.
(c) Disconnect the battery.
(d) Blow into pipe E and check that air comes out of the
air filter.
If a problem is found, replace the VSV.