ZHEJIANG KAYO MOTOR CO., LTD.
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50
Install the cylinder head assembly
- worn or defective seal is forbidden, replace new seal.
- make sure the oil path on cylinder head is open.
- make sure the locating pin in right place before installing cylinder head.
Cylinder and piston
Note :
1.
No dust or other foreign bodies in the crankcase.
2.
The surfaces of cylinder and piston are clean.
3.
Smear oil for lubrication before installing cylinder and piston.
Main parameters and maintenance standards
No.
Item
Standard
Limits
Remark
1
Cylinder
Cinder diameter
Φ44~φ44.01
Φ44.08
Cylindricity
0.005
0.01
Flatness of cylinder face
0.04
0.06
2
Piston
Skirt diameter of piston, H=7
Φ43.975~φ43.985
Φ43.90
Pin outer diameter
φ12.994~φ13.0
φ12.98
Pin diameter
φ13.002~φ13.008
φ13.02
Clearance between piston pin and
piston pin hole
0.002~0.014
0.02
3
Piston ring
Closed
internal
First ring
0.1~0.25
0.35
Second ring
0.1~0.25
0.35
Oil ring
0.2~0.5
0.7
backlash
First ring
0.015~0.05
0.06
Second ring
0.015~0.05
0.06
4
Clearance between cylinder and piston
0.005~0.035
/
5
Inner diameter of small end of connecting rod
φ13.015~φ13.022
Φ13.044
Troubleshooting
No.
Faults
Possible causes
Remark
