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Types and Technical Terms of The Cylinder liner
Types and Technical Terms of The Cylinder liner
1.Wet cylinder
The location bores and particularly the running surfaces in the cylinder block must be
cleaned carefully and they must be undamaged. Corroded surfaces must be reworked
(used flange liners and outer diameter oversize liners). As this is done, make sure that
the liners moves in easily and that they take up the correct position (the projecting
length of the liner must be in accordance with the regulations of the engine
manufacture). After the liner has been installed with the seat rings that belong to it.
(use slip agent), the cylinder diameter is to be checked particularly in the region of
seal rings so as to determine whether any deformation has been caused by pinched
sealing rings. Using the wrong sealing rings (wrong diameter/ wrong materials) can a
narrowing of the cylinder which can lead to engine damage.The cooling system
should be pressure tested after the liners have been installed so as to determine
whether there is any leakage before the engine is started.
2.Semi-finished cylinder liner
The surface which supports the flange must be vertical to the location bore and it must be
sufficiently and evenly beveled. If the liner flange is unevenly supported it can tear off. After the
installation of the liner, which is only semi-finished in its inside diameter, this cylinder boring is
finely bored and then finished by honing until it has the specified dimensions or, in the case of
finely bored liner.It is only finished by honing (tolerance accordingly to DIN ISO H5). The surface of
the liner must be flush to the sealing surface of the cylinder block, if necessary,the block surface
and the liner must be finished by surface grinding.
3.Finished Cylinder liner
Before the liner is installed, the location bore in the cylinder block must be cleaned
carefully and must be checked to ensure the accuracy of the dimensions and to
determine whether any distortion has occurred. Out of center or damaged bores can
be reworked for the installation of oversize liners. It is important for this that the
locating bore is cylindrical, as this is what determines the geometrical shape of the
inside of the pressed in, thin walled liner.
4.Air cooling cylinder liner
In accordance with the instructions from the engine manufacture, cast iron cylinders
or light alloy cylinders are used. Light alloy cylinders are separated into several groups
due to the small installation clearance in the standard cylinder dimensions
Cylinder liner material:
|
Chemical Compositions (%) | |
|
CODE |
Boron Cast Iron |
|
C |
2.9~3.4 |
|
Si |
2.2~2.8 |
|
Mn |
0.5~0.9 |
|
P |
0.1~0.4 |
|
S |
≤0.09 |
|
As |
≤0.022 |
|
B |
0.05~0.08 |
|
Cr |
0.2~0.4 |