Chery Tiggo. Manual — part 42
CYLINDER HEAD UNIT REPAIR
Cylinder Head
Specifications
Torque Specifications
DESCRIPTION
TORQUE (N·m)
Cylinder Head Bolts
1st Step: Tighten the bolt to 40 ± 5 N·m
2nd Step: Tighten the bolt an additional 90 ± 5°
3rd Step: Tighten the bolt an additional 90 ± 5°
Cylinder Head Cover Bolts
11
Clearance Specifications
DESCRIPTION
SPECIFICATION (mm)
Cylinder Head Flatness
0.04
Intake Valve Deflection
0.02
Exhaust Valve Deflection
0.04
Spring Height
47.7
Disassembly
NOTE :
The following special tools are required to perform the repair procedure:
• CH-20010 - Camshaft Holder
• CH-20011 - Valve Seal Installer
• CH-20012 - Valve Stem Seal Installer Guide
• CH-20013 - Valve Seal Remover
• CH-20017 - Valve Keeper Installer
• CH-20018 - Valve Spring Compressor
NOTE :
Replacement cylinder head comes complete with valves, seals, springs, retainers, keepers, tappets, and camshafts.
1. Remove camshafts (See Camshaft Removal & Installation in Section 02 Engine).
2. Remove the hydraulic tappet assembly (1).
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3. Using the special tool CH-20018 (1), compress the
valve spring.
4. Remove the valve keeper (1), valve spring retainer
(2) and valve spring (3).
5. Push the valve stem from the cylinder head and
remove the valve (4).
6. Using special tool CH-20013 (1), remove the valve
oil seal.
7. Remove the valve guide.
8. Remove the spark plugs.
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Inspection
Inspect the cylinder head for the following:
• Cylinder head must be flat within 0.04 mm.
• Inspect camshaft bearing journals for scoring.
• Remove carbon and varnish deposits from inside of
valve guides with a valve guide cleaner.
• Verify the valve tappets move freely in their bores,
and that they have been rotating.
• Check the valve guide height.
Assembly
1. Install new valve guide if necessary.
2. Install new valve seat if necessary.
3. Using special tool CH-20011 (1) and CH-20012 (2),
install the new valve oil seal.
4. Install the valves into the cylinder head (larger diameter on intake side).
5. Install the valve springs.
6. Install the valve spring retainers.
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7. Using a valve spring compressor CH-20018 (1),
compress the valve springs.
8. Install the valve keepers.
9. Strike the valve stem lightly with a plastic hammer after installation to verify proper assembly.
10. Install valve tappets in the head.
11. Install the camshafts.
Installation Notes:
• Coat the valve oil seal with engine oil.
Camshaft
Specifications
Camshaft Specifications
DESCRIPTION
SPECIFICATION (mm)
Intake Cam Lobe Height
37.15
Exhaust Cam Lobe Height
37.05
Journal #1 Outer Diameter
31.934 - 31.95
Journal #2, #3, #4, #5, Outer Diameter
23.947 - 23.96
Cam Bearing #1 Inner Diameter
32 - 32.025
Cam Bearing #2, #3, #4, #5, Inner Diameter
24 - 24.021
Journal #1 Clearance
0.05 - 0.091
Journal #2, #3, #4, #5 Clearance
0.04 - 0.074
Intake Camshaft Axial Clearance
0.15 - 0.20
Exhaust Camshaft Axial Clearance
0.15 - 0.20
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