Operation and Maintenance Manual forWP10 Series Four-valve Diesel Engine (China IV, V)
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dismantle the high pressure fuel line joint.)
◆ Check whether there is leakage in the high pressure fuel line.
The leakage of high pressure fuel line is quite easy to be noticed. Check whether the joint nut of the high pressure
fuel line is loose, and tighten it if necessary.
◆ Check if the fuel line and the fuel filter are blocked. It is recommended to replace the fuel filter element
timely.
Inspection method: loosen the bolt at outlet of secondary fuel filter, drive the diesel engine to run with the starter
motor. If only a small amount of fuel flows out, it means that the filter element is blocked, please replace the filter
element.
◆ Check if the initial voltage value of the common rail pressure sensor is around 500mV, or check if thecommon
rail pressure is set to be 30-50MPa.
Measuring method:
Enter the operating interface of the fault diagnosis instrument, select “actual value”, and click “next”.
Then all “actual values” will be displayed, and among them, select “accumulator pressure sensor voltage” and
“rated fuel rail pressure”.
If any abnormal condition occurs, first check the connector, and if it is OK, then the common rail pressure sensor
may be damaged.
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