Engine Exhaust
The three - cylinder or four -
cylinder diesel engine adopts unitary exhaust manifold, and the six - cylinder
engine adopts inserted exhaust manifold which is made up of two parts ( every
part for three cylinders) and sealed with narrow width ring. The joint between
exhaust manifold and cylinder head is sealed with stainless steel gasket, the
convex surface of which should face to the cylinder head. The torque for tightening nut is 45 t 5Nm.
The exhaust resistance of diesel
engine should be as small as possible; therefore the exhaust manifold must have
sufficient sufficient or area and with bends as few as possible, because the
performance of engine will be influenced obviously if the exhaust resistance
exceeds a certain value. The sum of the resistances of exhaust main and muffler
should not be more than 7.5kPa for natural aspirated engine, and not he more
than 5kPa for turbocharged engine.
Turbocharging and inter - cooling
system
Turbocharger: Both turbocharging
models and the turbocharging inter - cooling models of the 226B series engine
employ the radial flow exhaust turbocharger. See the accessory list for the
those models. The oil lubricating and
cooling the turbocharger flows into the turbocharger from the main oil passage
then directly back into the crankcase.
The exhaust turbocharger is a
kind of running mechanism at its high speed and high temperature. The immediate
halt when the engine is running at high speed and with large load is strictly
forbidden. The right way is to decrease
the load and the speed gradually and let the engine run idly for another 5 -10
minute so as to avoid any damage to the turbocharger bearing. After the
turbocharger is disassembled, some clean engine oil should be put at the oil
inlet during the mounting process.
Charging air cooler (intercooler)
The temperature will go up after
the air goes through the turbocharger and gets pressured. The intercooler of
the 226B turbocharging inter - cooling engine features: air - air cooling. Is
used to lower the pressured intake air temperature.
Air - air cooling intercooler (
delivered conforming with the contract) , generally speaking, is assembled
together with the circulating water radiator, cooled by fan. The intercooler be
placed at the hack of the radiator. The intercooler could also be placed in
line with the radiator, determined by the overall fitting mechanism.
The maximum acceptable flow
resistance ( supercharger to intercooler/ intercooler to engines) then the
pressured air from the supercharger is passing through the pressure pipe should
be less than 2kPa. The flow resistance while going through the intercooler
should be less than 5.0 - 5. 5 kPa. So
the limit value of the total resistance when the pressured air is passing
through pressure pipe and intercooler is 7. 0 - 7. 5 ( kPa) ,
Electrical system
The system is consisted of
starter, chargeable generator, control instrument and storage battery. The
service voltage is 24V or 12V, subject to the choice of the customers.
Starter: the starter is a DC
motor controlled by electromagnetism. Without specific requirement, the rated
power is 4kW or 6kW at the working voltage of 24V and 2. 7kW or 4kW at the
working voltage of 12V.
Generator: The generator is a
kind of silicon rectifying generator equipped with transistor adjuster. The
rated voltage is 28V or 14V. The generator is connected parallelly with the
storage battery. The generator is self -
excited when working.
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