- 97 -
12 Crankcase/clutch/actuating lever
Preparation data-----------------12.1 Piston-----------------------------12.4
Fault diagnosis------------------12.2 Installation of the piston--------12.5
Cylinder body-------------------12.3 Installation of air cylinder------12.6
12.1 Preparation data
Matters needing attention in operation
All parts should be cleaned before inspection and test and should be blow dry with high pressure air.
Function of the cylinder body
:
the cylinder body provides space for the compression, burning and
expansion of air and plays a steering function to piston motion.
It also transmits part of the heat in the air cylinder to the surrounding cooling media.
Function of piston
:
1
.
Bearing the pressure caused by burning of combustible mixture gas and pass the pressure to the connecting rod,
driving the rotation of the crankshaft.
2
.
Shaping a combustion chamber with the cylinder cover and others.
Preparation reference
Unit
:
mm
Item
Standard value
Allowable limit
internal diameter
57.50-57.413
57.513
cylindricity 0.004
0.004
roundness 0.005
0.005
Air cylinder
flatness 0.05
0.05
piston mark direction
“IN” properly opposite to the
inlet valve
/
measuring point of the piston’s external
diameter
57.465
-
57.485
(
at the
bottom of the piston skirt
7mm
)
57.485
Bore diameter of piston pin hole
14.002
-
14.008 14.04
Outer diameter of piston pin
13.994-13.999
13.97
Clearance of cylinder and piston
0.03-0.053
0.053
First ring
0.03
-
0.07 0.10
clearance between the
piston ring and ring groove
Second ring
0.03
-
0.07 0.10
First ring
0.10-0.25
0.50
Second ring
0.20-0.35
0.60
close clearance of the
piston ring
oil ring
0.1
-
0.6
Clearance of piston and piston pin
0.003-0.014
0.03
the internal diameter of the connecting rod
small end
14.010
-
14.018 14.04
Piston
Piston ring
Piston pin
Clearance of connecting rod and piston pin
0.011
-
0.024 0.05
Summary of Contents for QJ150T-10
Page 15: ... 14 QJ150 10 ...
Page 73: ... 72 Rear wheel rear suspension ...
Page 78: ... 77 Lubrication system figure engine oil strainer oil pump bent axle camshaft piston ...
Page 87: ... 86 ...
Page 97: ... 96 ...
Page 104: ... 103 ...
Page 113: ... 112 Output axle Middle axle Input axle ...
Page 116: ... 115 The assembly of bearings and oil seal should use special tools to prevent damage ...
Page 125: ... 124 Muffler ...
Page 131: ... 130 ...