Preparing Documents - KEEWAY FACT 50 4T Maintenance Manual

13.Cylinder Block and Piston

Preparing documents-----------------13.1

Failure diagnosis --------------------13.2
Cylinder block-----------------------13.3
13.1 Preparing documents
Work Instructions
All parts shall be cleaned and blown by high pressure air before check.
Function of the cylinder block: cylinder block provides space for gas compression, combustion and expansion,
and also guides piston movement.
It also transfers part of heat energy in the cylinder to cooling medium around.
Function of the piston:
Piston bears pressure arising from mixed gas combustion inside the cylinder and transfers such pressure to the
connecting rod for driving the crankshaft.
It forms combustion chamber along with the cylinder cover.
It acts as slide valve for air inlet/stop, periodically compresses fresh mixed gas from the crankcase into the cylinder
and discharges exhaust gas after combustion in the cylinder.
Preparing Principles
Cylinder
Piston ring groove gap
Piston
Piston
ring
Clearance between piston and cylinder
Outer diameter of piston ring
Clearance between piston pin hole and piston pin
Inner diameter of the smaller end of the connecting rod
Item
Inner diameter
Bending
Cylindricity
Flatness
Roundness
Joint gap
Outer diameter of piston
Inner diameter of piston pin hole
Piston---------------------------13.4
Piston installation-------------13.5
Unit: mm
Standard
37-37.01
Top ring 0.02-0.06
Ring 2 0.02-0.06
Top ring 0.1-0.25
Ring 2 0.1-0.25
36.975-36.985
0.02-0.03
10.002-10.008
9.994-10
0.002-0.014
14.995-15.006
128
Limit for use
-
0.005
0.03
-
37.01
-
0.005
0.03
-
0.06
0.06
0.25
0.25
36.975
0.03
10.008
9.994
0.014
10.018