Operation and Maintenance Manual of WP13C Series Diesel Engines
Weichai Power Pursuit of Excellence
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2.Lubricating system
The lubricating system is functioned for wear reducing, flushing, cooling and rust proofing. Please use the
oil of CI or higher grade. Multi-grade oil shall be preferably selected for better cold starting performance.
Full-season multi-grade oil (such as 15W40) can also be used within the specified
temperature scope. During occasional low temperature period, oil preheating measures can be taken or
change the oil which is suitable for the environment temperature.
The oil change intervals shall be determined according to maintenance requirements.
Generally, the lubricating oil is not applied in delivery, so please apply it before starting the engine.
Please select the viscosity grades (see table 2) of lubricating oil according
to environment temperatures and only multi-grade lubricating oil is allowed.
It is recommended that Weichai special lubricating oil be used.
When the engine is stay still, the oil level shall be between the highest and lowest scale lines on the
dipstick.
Until now, there is no proof that the oil additives have any positive influence on running of WP13C
mechanical pump series diesel engine, so it is prohibited to use any oil additives.
Table 2 Lubricating oil grade selection
Caution:
For WP13C mechanical pump series diesel engine, it is not allowed to use grade CH and lower
grade lubricating oil. Please replace the oil filter element every time when changing the oil!
Pressure lubrication
Through a strainer, the oil pump absorbs oil from the oil sump, press the oil to the oil filter and the oil
cooler and then through the oil line system to the lubrication position. Most oil can reach the main bearing
and through the oil hole on the crankshaft to the connecting rod bearing. The cylinder liner surface and the
piston pin are lubricated by oil sprayed from nozzles. Lubrication of valve control system, supercharger, oil
pump, air compressor and intermediate gear bearing is also realized by pressure lubrication
through oil pipes and oil groove. The piston top is cooled by oil sprayed from nozzle to the internal cooled
oil cavity; and oil is cooled by coolant through the oil cooler. The oil pressure of oil circulation system is
adjusted by the pressure-limiting valve in the oil pump.
When starting the diesel engine, as the oil temperature is low and the viscosity is high, the oil pressure will
be high in a short time. However, with water temperature rises, the oil temperature also
rises, the oil pressure lowers gradually, and normal oil pressure shall be (350~550)kPa.
3.Fuel system
