Operation and Maintenance Manual forWP10 Series Four-valve Diesel Engine (China IV, V)
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◆ Causes and remedies for excessively high water temperature
① The water level in the tank is too low: Check for leakage, and add water if necessary;
② Fan rotate at low speed or does not rotate: Check the fan drive unit;
③ Water tank is blocked: Check the water tank, and clean or repair if necessary;
④ Water pump belt is loose: Adjust the tension as required;
⑤ Water pump gasket is damaged and water pump impeller is worn: Check, repair or replace;
⑥ Thermostat fault: Replace;
⑦ Water pipe seal damaged: Check the water pipe, joint, gasket, etc., and replace any damaged part.
◆ Causes for excessively high engine oil temperature and troubleshooting
① Low oil level in oil pan: Check the oil level and oil leakage, repair and add oil;
② Water temperature is high: Check the cause for high water temperatures, and eliminate it;
③ Oil cooler blocked: Check and clean.
◆ Causes for excessively high intake temperature and troubleshooting
Check the heattransferperformanceof intercooler.
(3) Synchronization signal fault
When this fault occurs, generally it is that the signal of one sensor is failure.
Read the flash code with flash code light, find the specific cause against the flash code table, and eliminate it.
(4) Flow metering unit fault
The flow metering unit is the actuator to control the common rail pressure, and it is mounted on the high pressure
fuel pump. In case of metering unit failure, the high pressure fuel pump will supply fuel to the common rail pipe
at the maximum capacity. At this time, the pressure relief valve on the common rail pipe will open, and the diesel
engine gives out clicking noise. The same occurs in case of fault to the rail pressure sensor.
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