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2.2.2 Measurement of valve guide inside diameter Use an inside micrometer to measure inside diameter of the guide. Fit clearance between intake valve stem and valve guide: 0.012~0.043mm Fit clearance between exhaust valve stem and valve guide: 0.032~0.063mm Note: If abnormal noise is generated due to serious wear of valve guide, do not replace the valve guide, because the assembly technique requirements to valve guide is very strict; please replace the cylinder head assembly.
2.3 Boring and grinding valve seat insert 2.3.1 Inspection of fitting surface of valve. Apply a circle of red lead on the valve sealing strip and then gently place the strip onto the valve seat insert, softly and forcibly press it down, but do not turn it. Take out the valve, observe if there is broken part on the red lead, if any, boring and grinding the valve seat insert is required.
2.3.2 Select an appropriate reamer, use 45° conical surface as cooperate standard value to check valve cooperation position: the optimal position is the center of the valve, if not so, be sure to revise. Cut on the conical surface 70° inward and 30° outward at the center of the cooperation position.
2.3.3 Perform seat grinding for the valve sealing strip with polishing compound
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