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AST
C
HINA
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HIPBUILDING
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NSTITUTE
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ACTORY
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SIYANG
四洋
R
4.MAIN STRUCTURE OF ENGINE
4.1 FUEL SYSTEM
The fuel system are important controlling components of the diesel
engine. They are composed of injectors, fuel filter, injection pump and
high and low pressure pipes and various connections. The feed pump
draws fuel from the fuel tanker and deliveries it to the filter. The fuel, after
passing through the filter, passes into the injection pump. The fuel passes
into the high pressure pipe then to the injector which atomizes the fuel to
fine droplets for combustion. Small amount of fuel passes through the oil
return pipe into the fuel tanker
Fuel pump timing ……………………. 24~27
゜
TDC
Injection pressure ……………………. New: 20.5Mpa/used: 20Mpa
Diesel oil conforming GB252-87
light diesel fuel grades No.0 or No.-35
or to USA specification ASTM D-975-77 Grades NO.1-D and 2-D.If the
engine has to work in areas with extremely low ambient temperatures, use
fuel with good clog characteristic. Clog point(CFPP) -25
℃
.
4.2 LUBRICATION SYSTEM
The lubrication system is made up of an oil sump, an suction strainer, an
oil pump, lube cooler ,filter and various pipes. The oil pump draws the lube
oil contained in the oil sump through oil suction strainer then the lube oil
flow into lube cooler and lube filter. The lube oil in main oil passage is
separated into three flows. One passes through main bearing and flow into
connecting rod bearing; The second passes through the camshaft bearing
and flow the sloping oil passage to lubricate the valve rocker arm shaft liner;
the third one flow into timing idle gear bearing. Cylinder liner, piston, piston
pin, connecting rod l shells etc are splash or atomized lubricated.
The lubrication oil should be added properly. If it is added to much, it
would be burning; if added to less, the bearing shells would be burnt. It is
ideal to add the oil until its level reaches between the upper and low marks
on the dipstick. When the oil level goes down to the low mark, lube oil
should be added. Before starting the diesel engine, the oil level should be
checked.
