Operation and Maintenance Manual for PowerKit 6M16 Series
10 of 40
Forced lubrication:
The engine oil from the oil pan passes through the oil strainer and then is pumped into the oil filter
and oil cooler by the oil pump, and finally arrives at the positions need to be lubricated through the
oil line system. Most of the oil will come to the main bearings and then to the connecting rod
bearings via the oil hole of crankshaft. The lubrication of cylinder liner surface and piston pin is
achieved through the lubricating oil injected by the piston cooling nozzle. The valve control system,
turbocharger, oil pump and intermediate gear bearing are also provided with forced lubrication via
the oil pipe and oil groove. The piston head is cooled through injecting lubricating oil to the inner
chamber of piston by the piston cooling nozzle; and the lubricating oil is cooled by the cooling
water in oil cooler. The pressure of lubricating oil in the circulation system is regulated by the
pressure limiting valve in the oil pump body.
When starting the diesel engine, with low oil temperature and high viscosity, the oil pressure will be
higher, but as water temperature of the diesel engine increases, the oil temperature will increase and
the oil pressure will gradually drop to the normal range of 350kPa~580kPa.
2.3 Fuel system
Since the fuel system is of critical part of the diesel engine, the manufacturing and installation of
fuel tank and fuel pipe and quality of the fuel used can influence the performance and reliability of
the diesel engine. The fuel tank prepared by the user must be clean and free of rust and corrosion,
and it must be made of materials which do not react with diesel fuel to avoid production of foreign
matters. The fuel tank must be provided with fuel drain device to drain the water and foreign
matters in the fuel. It is recommended that a valve should be designed on the outlet pipe of the fuel
tank to facilitate maintenance of the pipeline.
2.3.1 Fuel returning
When installing, the fuel return pipe shall not contact with hot parts (e.g. exhaust manifold,
turbocharger, and exhaust gas recirculation pipe) of the diesel engine. There should be no throttling
area in the fuel return pipe. The fuel return pipe cannot touch any sharp edge, be folded to form
sharp corners or even be twisted. Incorrect installation of fuel return pipe will cause fuel leakage.
