SQR7080 Service Manual 372 Engine Mechanical System
41
Chery Automobile Co., Ltd
7-4-3 Check the clearance between the piston and the
cylinder wall
1. The positions for measuring the inner diameter of
the cylinder and the piston skirt are as shown in the
right figure. Replace and repair the piston or the
cylinder body, or bore the cylinder if the measured
results exceed the limits
[Benchmark] 0.018～0.03
[Limit] 0.10
[Reference] The clearance between the piston and the
cylinder hole is subject to the innermost diameter of
cylinder in vertical direction minus the maximum
outer diameter of the piston.
2.After the replacement of the piston or the cylinder
body, it is needed to confirm the clearance of the
replaced cylinder once again.
Datum: 0.018～0.030
7-4-4 Crankshaft
1. Check the coaxiality of the main shaft diameter
(1) Use the centimeter to measure the coaxiality.
Replace the crankshaft if the measurement result
exceeds t he limit.
[Limit] 0.03mm
Attention: The bending value should be 1/2 of the
fluctuation for one circle of turning the crankshaft.
2. Check the tears and wears of the crankshaft
（1）Use a caliper to measure the shaft diameter , and
work out the circularity and cylindricity.
[Limit] 0.005mm
(2)Use a caliper to measure the connecting rod
diameter ,and work out the circularity and cylindricity.
[Limit] 0.004mm
the measuring position is shown as the figure,
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