6. Cylinder Head/Valve
6-2
Precautions In Operation
General Information
•
This chapter is contained maintenance and service for cylinder head, valve, and camshaft as well
as rocker arm.
•
Cylinder head service cannot be carried out when engine is in frame.
Specification
Unit: mm
Item Standard
Limit
Compression pressure
12 ± 2 kg/cm²
-
Intake 25.688
25.290
Camshaft
Height of cam lobe
Exhaust 25.519
25.120
ID of valve rocker arm
12.000~12.015
12.100
Rocker
arm
OD of valve rocker arm shaft
11.966~11.984
11.910
Intake 4.975~4.990
4.900
OD of valve stem
Exhaust 4.950~4.975
4.900
Guide seat
5.000~5.012
5.030
Intake 0.010~0.037
0.080
Clearance between
valve stem and guide
Exhaust 0.025~0.062
0.100
Free length of valve spring
35.000
31.500
Valve
Valve seat width
1.000
1.600
Connection Flatness of cylinder head
- 0.050
Torque Value
Cylinder head bolt
1.0~1.4kgf-m
Cylinder head bolt (LH)
1.0~1.4kgf-m
Cylinder head Nut
1.8~2.2kgf-m (apply with oil on bolt thread & seat)
Sealing bolt of timing chain auto-tensioner
0.8~1.2kgf-m
Bolt of timing chain auto-tensioner
1.0~1.4kgf-m
Timing gear cover bolts
0.7~1.1kgf-m (apply with oil on bolt thread & seat)
Spark plug
1.0~1.4kgf-m
TOOLS
Special service tools
Valve reamer: 5.0mm
Valve guide driver: 5.0mm
Valve spring compressor
