Chery Tiggo 5 (T21). Manual — part 118
07–
58
07
4. Remove the valve spring upper seat (1), valve spring (2)
and valve (3) from cylinder head.
5. Using a valve oil seal remover (1), remove the valve oil
seal (2).
6. Using a flexional magnetic rod, remove the valve spring lower seat.
Inspection
1. Check cylinder head.
a. Check appearance.
Check if there are scratches on the camshaft bearing journal.
Remove carbon deposits and varnish inside valve guide with the valve guide cleaner.
Make sure that valve cotter can move and rotate in cylinder bore freely.
b. Check cylinder head flatness.
Using a precision ruler and feeler gauge, check
cylinder head flatness. Cylinder head flatness must be
within 0.04 mm.
If cylinder head flatness is not within the specified
range, repair or replace cylinder head.
RT21070560
1
2
3
1
RT21070570
2
RT21070580
Measurement Item
Specification
(mm)
Cylinder Head Flatness
0.04
07–
59
07
c. Check cylinder head height.
Using a precision ruler, measure cylinder head height.
If cylinder head height is not within the specified
range, replace cylinder head.
2. Check valve spring.
Using a vernier caliper, measure free length of valve
spring and length of valve spring with the pre-pressure
between 249 N and 271 N.
If valve spring length is not within the specified range,
replace valve spring.
3. Check valve.
a. Clean valve.
Using a scraper, remove the carbon deposited on
valve head
Using a wire brush, clean the valve thoroughly.
b. Check valve height.
Using a micrometer, measure valve height.
If height is less than specified value, replace the
valve.
a
RT21070581
Measurement Item
Specification
(mm)
Cylinder Head Height
97
CAUTION
During replacement, cylinder head should be fully equipped with valves, oil seals, springs, spring seats,
cotters, hydraulic lifters and camshafts.
RT21070582
Measurement Item
Specification
(mm)
Valve Spring Free Length
47.70
Valve Spring Length under
Pre-pressure
41
RT21070583
RT21070584
Total Height
Measurement Item
Specification
(mm)
Intake Valve Height
107.998
Exhaust Valve Height
106.318
07–
60
07
c. Check valve head.
Measure valve head thickness "a" and record.
Check if the contacting area of grommet is even
and if grommet is located at the center of valve
inclined plane, and measure grommet width "b".
If it is not within the specified range, replace valve.
d. Check valve stem diameter.
Using a micrometer, measure valve stem diameter.
If valve stem diameter is not within the specified
range, check the clearance between valve stem and
valve guide.
e. Check clearance between valve and valve guide.
Using a caliper gauge, measure the inside diameter of
valve guide.
Clearance between valve and valve guide = Valve
guide inner diameter - Valve stem diameter
If clearance is not within the specified range, replace
valve or valve guide.
RT21070585
b
a
Measurement Item
Specification
(mm)
Intake Valve Head Thickness
0.9
Exhaust Valve Head Thickness
0.7
Intake Valve Grommet Width
2.263
Exhaust Valve Grommet Width
2.828
RT21070586
Measurement Item
Specification
(mm)
Intake Valve Stem Diameter
5.98 ± 0.008
Exhaust Valve Stem Diameter
5.96 ± 0.008
RT21070587
Measurement Item
Specification
(mm)
Valve Guide Inner Diameter
6 - 6.015
Measurement Item
Specification
(mm)
Clearance Between Intake Valve and
Guide
0.012 - 0.043
Clearance Between Exhaust Valve
and Guide
0.032 - 0.063
07–
61
07
4. Check valve stem protrusion amount.
a. Using a vernier caliper, measure distance "a" (valve
stem protrusion amount) between valve stem end
surface and valve spring seat end surface.
If valve stem protrusion is not within the specified
range, replace valve.
Assembly
HINT:
Clean all components to be assembled thoroughly before assembly.
1. Install the valve (1) into the cylinder head.
HINT:
Distinguish intake valves and exhaust valves during
installation.
Apply a light coat of engine oil to the valve stem end
when assembling the valve.
2. Install the new valve spring lower seat (2) if necessary.
HINT:
Bottom of valve spring lower seat should face the
cylinder head.
3. Install the valve oil seal.
HINT:
Apply a light coat of engine oil to the installation surface
of valve oil seal end when assembling the valve oil seal.
a. Install the valve oil seal guide sleeve (3) to the valve
stem.
b. Install the valve oil seal (4) to the valve oil seal guide
sleeve.
c. Tap the valve oil seal installer lightly with a rubber
hammer to install the valve oil seal in place.
a
RT21070588
Measurement Item
Specification
(mm)
Intake Valve Stem Protrusion
31.497 - 31.515
Exhaust Valve Stem Protrusion
31.497 - 31.515
CAUTION
Soak new valve oil seal in oil for several minutes before installation.
Check if valve spring lower seat is installed properly before installing valve spring.
Variable pitch valve spring is used, which must be installed with the painted side facing the valve spring
lower seat.
5
4
3
2
1
RT21070589
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