江淮汽车 部门：客户服务部
Mechanical Part of
Engine
Standard value: 0.02-0.04mm
If the calculated value exceeds the limit, replace piston and piston ring assembly.
⑨
Boring Cylinder
a.
The piston with extended size to be used should be determined in accordance with the cylinder
which has the highest bore.
Pistons of the following extended sizes, i.e. 0.25mm, 0.50mm, 0.75mm and 1.00mm, are applicable.
b.
Measure the diameter of piston to be used.
After boring cylinder, clearance between piston and cylinder bore must be within standard range. The
piston diameter should be measured at the position shown in Figure.
c.
Calculate the boring size based on the piston diameter.
[Boring size]
＝
[outer diameter of piston]
＋
[clearance between piston and cylinder (0.02-0.04mm)]
－
[grinding margin (0.02mm)]
d.
Boring each cylinder till it obtains the calculated boring size.
Attention:
■
To avoid the distortion due to heat during the boring course, bore the cylinders in following
sequence: Cylinder 2 → Cylinder 4 → Cylinder 1 → Cylinder 3
e.
Grind the cylinder till it meets the final processing size (outer diameter of piston
＋
clearance
between piston and cylinder)
⑩
Diameter of Main Crankshaft Journal
Measure the main crankshaft journal by the outside micrometer.
Standard value: 46.0mm
If it exceeds the standard, please follow the rules of selection to replace.
⑪
Diameter of Main Journal of Connecting Rod
Measure the diameter of main journal of
connecting rod by using outside micrometer.
Standard values:43.0mm
Replace the connecting rod bearing shell if
measurement exceeds standard value.
⑫
Gap of Connecting Rod Bearing Shell
Note: Use the plastic divider to perform the
measurement.
a.
Clean any engine oil from the connecting rod
journal and connecting rod bearing shell.
Fig.1.1.062
Dial Indicator
