Parsun F40 EFI, Maintenance Manual

Page: 69 / 119

64
2. Check camshaft roundness. Replace
it if necessary.
Roundness limit: 0.03mm
3.
Check camshaft journal diameter and the inner diameter of cylinder head shaft hole.
Replace it if necessary.
Camshaft journal: 36.935~36.955mm
Inner diameter of cylinder head shaft hole b: 37.000~37.025 mm
4.
Calculate the camshaft oil clearance c (c=b-a) and replace it if it does not meet the
specified value.
Camshaft top:
0.06~0.10 mm
Centre and rear part of camshaft: 0.05~0.09 mm
Note:
The camshaft and cylinder head need to be replaced together.
Check the oil pump
1. Remove the screw fixing the oil pump and remove the oil pump.
2.
Open the oil pump cover and check the oil pump rotor clearance as shown. If it does
not meet the specified value, replace it.
Clearance a between
outer rotor and shell
0.09~0.15 mm
Clearance b between
outer rotor and inner
rotor
0.01~0.10 mm
Clearance c between
rotor and cover
0.03~0.08 mm
Joint surface of cylinder head and engine body
1. Remove carbon deposits from combustion chamber and check for damage.
2. Check the warpage of the joint surface with a ruler and a clearance gauge. If it does not
meet the specified value, replace it.
Cylinder head buckling limit: 0.03mm
Replace valve guide
1. Knock off the valve guide in the direction of the combustion chamber.
2. Knock in the new valve guide from the top surface of the cylinder head.
Note:
Apply oil to the surface of the valve guide before installation.
3. Hinge the inner diameter of the guide to the specified value with a reamer.
Cam
height
Inta
ke
30.83~31.09 mm
Exh
aust
30.83~31.09 mm
Diameter of
base circle
25.90~26.10 mm
a
b
c