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XI Cylinder Block and Piston
Service Data 11.1
Fault Diagnosis
11.2
Cylinder Block
11.3
Piston
11.4
11.1 Service Data
Function of cylinder block:
It offers a space for gas compression, combustion and expansion, and guides in piston motion.
It also transfers some of heat to surrounding cooling media.
Function of piston:
1
．
Withstand pressure as a result of combustion of combustible mixed gas, and transfer such pressure to the
connecting rod to drive the crankshaft.
2
．
Form the combustion chamber along with the cylinder cover.
Precautions
All parts must be cleaned before being checked, and purged with high-pressure air.
Standard Value and Allowable Limit of Reference Items
Item
Standard value
Allowable limit
Cylinder
ID
57.3-57.301
57.351
Cylindricality
0.007
0.027
Roundness
0.005-0.007
0.025
Flatness
0.05
0.055
Piston OD (measuring point)
57.270-57.275
57.26
Piston pin hole ID
14.002-14.008
14.04
Piston pin OD:
13.996-14
13.966
Stroke between piston and piston
pin
0.002-0.012
0.062
Stroke between piston
ring and ring slot
Ring 1
0.03-0.07
0.12
Ring 2
0.03-0.07
0.12
Piston ring closure
stroke
Ring 1
0.15-0.3
0.4
Ring 2
0.25-0.4
0.5
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