75
2. Check the inclination of the valve spring; Replace it if it is beyond the limit.
Inclination limit: 1.8 mm
Camshaft
1. Check the cam dimensions.
Replace the camshaft if necessary.
2. Check camshaft radial runout.
Replace it if necessary.
Runout limit: 0.03mm
3. Check camshaft bearing journal diameter and camshaft cover inner diameter. Replace it
if necessary.
Diameter of camshaft bearing journal: 24.960~24.980 mm
Inner diameter of camshaft cover: 25.000~25.021mm
Replace valve guide
1. Knock off the valve guide from the combustion chamber side.
2. Knock in the new valve guide from the top surface of the cylinder head.
Mounting height: 11.3～11.7 mm
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.
Valve guide inner diameter: 5.504～5.522mm
Note:
When reaming, turn the reamer clockwise;
Do not rotate the reamer counterclockwise when taking it out;
Make sure that metal debris generated by reaming is removed.
Check valve seat ring
1. Remove carbon deposit from the valve.
2. Coat a thin layer of dye evenly on the sealing surface of the valve seat ring.
3. Grind the valve on the valve seat with the valve grinding tool.
4. Measure the width of valve sealing surface.
Dye will stick to the valve sealing surface.
If the valve and valve seat ring fit incorrectly or the sealing surface width does not meet
the specified value, trim the valve seat.
If the contact surface is uneven, replace the valve guide.
Width of valve sealing surface: 1.1～1.5 mm
Trim the valve seat ring
Intake cam
height
41.011~41.111 mm
Exhaust cam
height
41.260~41.360 mm
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