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Chery QQ Service Manual
Mechanical Part of SQR 472Engine
25
3.2.2 Measure the free state of the spring. Standard value: 37mm
3.3 Inspection of valve 3.3.1 Check if it is deformed or abrades. Inspection of valve Unit: mm Item Standard value Limit: 0.10 IN 0.85~1.41 — Width of seal EX 1.07~1.36 — IN 1.0±0.2 0.75 Thickness of top of valve EX 1.0±0.2 0.75
3.3.2 Check the clearance of valve guide and valve stem. 3.3.2.1 Measure the inside diameter of valve guide with dial gauge, the outer diameter of valve stem with micrometer caliper. 3.3.2.2 Figure out the difference of measured values and the clearance. If the clearance is beyond the specified value, replace valve or guide. Notice: As can be seen from the right picture, at measuring point, work out the clearance of last abrasion part. Item Standard value Limit: 0.10 Valve guide inside diameter(mm) φ5.0
— Valve guide outer diameter(mm) φ5.0 — IN 0.056~ 0.020mm 0.07 Clearance EX 0.066~ 0.030mm 0.08
Thickness of Top Measurement Position of Outer Diameter Measurement Point Measurement Point Measurement of Valve Guide Inside Diameter |