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1. Check the width of the valve sealing surface if it is not within the specified scope. Trim
the valve seat ring.
Width of sealing surface:
Intake valve
1.84～2.97 mm
Exhaust valve
1.98～3.11 mm
2. Check the valve edge thickness T; If the specified value is not met, replace the valve.
Valve edge thickness:
Intake valve
0.6～1.0 mm
Exhaust valve
0.7～1.1 mm
3. Check valve stem diameter. If it is not within the specified scope. Replace the valve.
Valve stem diameter.
Intake valve
5.48～5.49 mm
Exhaust valve
5.46～5.47 mm
4. Check the roundness of the valve stem. If it exceeds the limit, replace the valve.
Valve stem roundness limit 0.03mm
5. Check the inner diameter of the valve guide.
Inner diameter of the valve guide. 5.50～5.51 mm
Attention:
When replacing valve, be sure to use new valve guides and valve seal.
Valve spring
1. Check the free length of the valve spring; If it is less than the specified value, replace it.
Free length: 39.85 mm
Min. free length: 37.85 mm
2. Check the inclination of the valve spring; If it exceeds the limit, replace the valve.
Inclination limit: 1.7 mm
Valve rocker and rocker shaft
1. Check the contact surface of the valve rocker and rocker shaft for wear. Replace it if
necessary.
2. Measure whether the inner diameter of the valve rocker and the outer diameter of the
rocker shaft conform to the specified values. Replace it if necessary.
Inner diameter of the valve rocker: 16.000～16.01 mm
Outer diameter of rocker shaft: 15.97～15.99 mm
Camshaft
1. Check cam size.
Replace the camshaft if necessary.
2. Check camshaft roundness. Replace it if necessary.
Roundness limit： 0.03mm
Height of cam
Intake
30.89~30.99 mm
Exhaust
30.82~30.92 mm
Diameter of base circle
25.95~26.05 mm
T
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