Parsun F40 EFI, Maintenance Manual

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1. Check the width of valve sealing surface; If it is not within the prescribed 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; Replace the valve if it does not meet the specified
value.
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 prescribed scope, replace the valve.
Valve stem diameter:
Intake
valve
5.48
～
5.49 mm
Exhaust
valve
5.46
～
5.47 mm
4. Check valve stem roundness. If it is beyond the limit, replace the valve.
Valve stem roundness limit: 0.03mm
5. Check the inner diameter of the valve guide.
Valve guide inner diameter: 5.50
～
5.51 mm
Note:
When replacing the valve, be sure to use new valve guide and valve oil seal.
Valve spring
1. Check the free length of valve spring; Replace it if it is less than the specified value.
Free length: 40.0 mm
Minimum free length: 38.4 mm
2. Check the inclination of the valve spring; Replace it if it is beyond the limit.
Inclination limit: 1.7 mm
Valve rocker and rocker shaft
1. Check the contact surface of valve rocker and rocker shaft for wear. Replace them if
necessary.
2.
Measure whether the inner diameter of valve rocker and outer diameter of rocker shaft
meet the specified values. Replace it if necessary.
Inside diameter of valve rocker: 16.000
～
16.018 mm
Outside diameter of rocker shaft: 15.73
～
15.84 mm
Camshaft
1. Check the cam dimensions.
Replace the camshaft if necessary.
T