SQR7080
维修手册
372
发动机机械部分
7-4 Routine checks
7-4-1 Cylinder block
1. Checks on the levelness of cylinder top surface
(1). Use a ruler and feeler to do the measurements of
the six parts as shown in the right figure.
[Limit]
0.08mm
2. The use of cylinder meter: Measure the values at the
parts as shown in the right figure and work out the
maximum value and the minimum value. Replace the
cylinder body or do the boring of the cylinder if the
values exceed the limits.
[Limit]
0.03mm
[ Reference]
Circularity
：
A-B or a-b
Cylindricity
：
A-a or B-b
[Reference]
Cylinder standard diameter:
φ
72.00-72.01mm
Bottom dead
center
Top dead
center
7-4-2 Piston
1. Check the clearance between the piston pinholes.
(1) Use a caliper to measure the positions of the piston shown in the following figure, with the
maximum value as the size of the piston pin diameter.
(2) Use the inner diameter centi-meter to measure the positions of the piston hole diameter shown as
the following figure, take the minimum value as the size of the pinhole diameter.
41
Chery Automobile Co., Ltd
