Lubrication system
Quality grade of lubricating oil
Lubricating oil is classified according to
its quality and characteristics usually by
API (American Petroleum Institute) or
GB (Chinese National Standard) (Oil
Standard GB/T7631).
Oil allowed for this set:
API grade: CF CG;
GB grade: CF CG.
The diesel engine can be provided with
CF grade of oil, allowing high-quality oil
to replace low-quality oil.
Lubricating oil viscosity
Since the viscosity of the oil depends
largely on the temperature, the
viscosity of the lubricating oil
decreases sharply with the
temperature rise. Refer to Fig. 5-4 to
select the most appropriate oil
according to the ambient temperature.
Operation Manual of WEICHAI GENSET
Grade 5W/20CF-4 lubricating oil
should be used.
The engine lubrication system is
essential to ensure the reliable
operation of engine and prolong its
service life and also a significant part of
regular engine maintenance.
The recommended lubricating oil
replacement cycle must be observed,
and the lubricating oil filter must be
replaced at the same time.
1) Start the set so that the water
temperature reaches 60 ℃ . After
shutdown, prepare a vessel to collect
the discharged oil, and immediately
open the oil drain valve of the oil pan
(the position of the oil drain valve is
shown in Fig. 5-5) to drain the oil and
impurities, and take care to prevent
burns.
Fig. 5-5 Oil drain valve of diesel engine
Fig. 5-4 Selection of lubricating oil
grade
In order to ensure safe and reliable
operation of diesel engine, please
select Grade 10W/40CF-4 or
20W/40CF-4 lubricating oil. Grade
10W/40CF-4 can be used when the
temperature is between -15°C and
+30°C, while Grade 20W/40CF-4 can be
used when the temperature is
between -10°C and +30°C (Weichai
special engine oil as recommended).
When the temperature is below -15°C,
2) Remove the oil filter with a tool,
clean the surrounding part of the filter
cover, wipe the seal ring surface clean
(replace it if necessary), and remove
the O-ring because it may adhere to
the cover.
3) Use the filter properly and fill the
new filter with clean lubricating oil.
Otherwise, the engine will be damaged
due to short-time oil shortage.
4) Apply a thin layer of lubricating oil
to the seal ring surface before installing
a new filter.
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