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3. Check camshaft journal diameter and cylinder head shaft hole inner diameter. Replace
it if necessary.
Camshaft journal top diameter a1 (driven pulley mounting end): 36.93~36.94 mm
Camshaft journal centre and rear diametera2: 36.94~36.95 mm
Cylinder head shaft hole inner diameter b: 37.00~37.02 mm
4. Calculate camshaft oil clearance c (c=b-a), If the specified value is not met, replace it.
Top of camshaft: 0.06~0.10 mm
Centre and rear of camshaft: 0.05~0.09 mm
Attention:
The camshaft and cylinder head need to be replaced together.
Check the oil pump
1. Remove the screws securing the oil pump and remove the oil pump.
2. Open the oil pump cover and check the oil pump rotor clearance as shown If the
specified value is not met, replace it.
Clearance between outer
rotor and casing a
0.09~0.15 mm
Clearance between outer
rotor and inner rotor b
0.01~0.10 mm
Clearance between rotor
and cover c
0.03~0.08 mm
Joint surface of cylinder head and body
1. Remove carbon deposits from the combustion chamber and check for damage.
2. Use a ruler and gap gauge to check the bending of the joint surface. If the specified
value is not met, replace it.
Cylinder head bending limit: 0.03 mm
Replace valve guide
1. Knock off the valve guide from the direction of the combustion chamber.
2. Knock in a new valve guide from the top surface of the cylinder head.
Note:
Apply oil to the surface of the guide before installation.
3. Hinge the inner diameter of the conduit to the specified value with a reamer.
Inner diameter of the valve guide. 5.50～5.51 mm
Note:
Do not rotate the reamer counterclockwise when taking it out.
Check the valve seat ring.
1. Remove carbon deposits from the valve.
2. Apply a thin layer of dye evenly to the sealing surface of the valve seat ring.
3. Grind the valve on the valve seat with a valve grinding tool.
4. Measure the width of the valve sealing surface.
Dye will stick to the valve sealing surface.
If the valve and valve seat ring are not properly matched or the width of the sealing surface does not
conform to the specified value, trim the valve seat.
a
b
c
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