SANYANG INDUSTRY CO. SYM Service Manual page 63

6. CYLINDER HEAD/VALVE
PRECAUTIONS IN OPERATION
General Information
This chapter is contained maintenance and service for cylinder head, valve, and camshaft
as well as valve rocker arm.
Cylinder head service cannot be carried out when engine is in frame.
Specification
Compression pressure
Camshaft Height of cam lobe
Rocker
arm
OD of valve rocker arm shaft
OD of valve stem
Clearance between
Valve
valve stem and guide
Free length of valve
Torque Value
Cylinder head cover bolt
Cylinder head bolt (LH)
Bolt of timing chain auto-adjuster
Spark plug
Cylinder head nut
Valve adjustment fixing nuts
TOOLS
Special service tools
Valve reamer: 5.0mm
Valve guide driver: 5.0mm
Valve spring compressor
6-2
Item
ID of valve rocker arm
ID of Guide
spring
12 kg/cm²
Intake 25.686~25.786
Exhaust 25.50~25.60
10.000~10.015
9.972~9.987
Intake 4.975~4.99
Exhaust 4.955~4.97
5.000~5.015
Intake 0.010~0.037
Exhaust 0.030~0.057
Outer
Inner 32.26~32.56
0.8~1.2kgf-m
0.8~1.2kgf-m
0.8~1.2kgf-m
1.0~1.4kgf-m
0.8~1.2kgf-m
0.7~1.1kgf-m
Standard
35.25
SYM
unit: mm
Limit
-
25.29
25.12
10.10
9.910
4.90
4.90
5.030
0.080
0.100
-
-