4.
1 Yuchai 4D24/4D24T Engine Operation
4.1.1
Before starting
a) Check the oil level
in the oil sump. The level should be within the upper and lower scale limits of
the oil dipstick. If the oil volume is not enough, fill some oil as required
after checking the accordance of oil grade with temperature.
b) Check the coolant
level, add some coolant if necessary, and the accordance of coolant type with
temperature should be checked before filling.
c) Check and exhaust the
air in the fuel pipeline, and drain the water from the fuel filter.
d) Check the fuel tank.
If the fuel is insufficient, refuel it after checking the accordance of fuel
grade with temperature.
e) Check the electrical
system (including connecting wires, switches, electrolyte, fill enough
electrolyte if it's insufficient.)
f) Check the tension of
the driving belt, the tension should be moderate as required.
4.1.2
Start
Warning: Do not start
the engine in the environment where maybe flammable gases, that could be drawn
into the engine through the intake system, resulting in engine acceleration and
over-speed, which could cause fire, explosion and property damage. Engine
manufacturer can't know how the user operates the engine. Engine user and
operator are fully responsible for operating the engine safely under harsh
environments.
Attention: The engine
cannot be started unless the preparations have been completed and confirmed to
comply with requirements. (The engine could be started after warmed in cold
winter). The continuous starting time can't be over 10 seconds, the next
starting time interval is should not be less than l minute, if it can't be
started after three times trial in succession, user should check the reasons
and restart it after the malfunction is removed.
Attention: Check the oil
pressure: it should not be lower than 0.1MPa at idle speed. If the low oil
pressure indicator still flash within 15 seconds or the oil gauge displays no
oil pressure, please shut down the engine immediately to prevent engine from damage.
Check whether the water
pump operates properly and whether the coolant runs into water jacket of the
diesel engine. Check the leakage of oil, fuel and water, and shoot the trouble
if there is leakage. Check if there is abnormal noise. Check and confirm all
meters work well. Please stop the engine immediately and check the reason if
there is abnormal status, and send the engine to service center if necessary.
Cold start: Under the
cold environment, it's the same as conventional starting operations. If there
is preheating during start, please start the engine after the preheating
indicator is turned off or flashing.
Starting
steps after long time no running or oil replacement
To start the engine as
per the normal steps stated in this chapter. The engine could not be started if
the ECU detects that the oil pressure does not meet the minimum pressure of
motor starting value. It will take a longer time to start the engine if it is
no running for a long time or with replacement of oil.
4.1.3
Running
When the diesel engine
is started, it should keep running at low and medium revolution speed in
sequence with no load, the engine could not run at high speed with full load
unless the coolant temperature is higher than 60°C and oil temperature higher
than 45°C. Pay attention to the following instructions:
Attention: Do not idle
for long time, or else it may reduce engine performance. The oil pressure
should be not less than 0.1 MPa.
Observe the meters
reading frequently during engine operation, ensure the oil pressure, oil
temperature and water temperature to be in normal range.
If there is alarm from
meter, or engine abnormal sound or abnormal vibration, please stop the engine
and check it as soon as possible.
Pay attention to the
sealing of every water passage and the fuel pipe. If there is leakage, remedy
it immediately.
Attention: The new
engine or overhauled engine is not allowed running at high-speed or with heavy
load. In order to ensure a good break-in, the load should not exceed 65% within
the first 40 hours.
4.1.4
Stopping the diesel engine
Do not stop the engine sharply
unless there is an emergency. Keeps the engine running at low revolution speed
for 3 to 5 minutes before stopping it in order to make the engine cool down and
keep idling for 2 to 3 minutes in order that the oil could be carried to each
part of the engine, then stop the diesel engine.
When the ambient
temperature is below 5°C and the coolant is not sure to be anti-freezing,
discharge all of the coolant liquid after stopping the engine to avoid engine
damage by frost crack.
When the temperature is
below -30°C, the battery should be disassembled and moved to warm space,
otherwise it would be hard to start the engine.
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