Achievable functions of WD615 engine
test whether the oil pressure, water temperature,
voltage are normal, and whether the engine is
the engine has fault or not, possible fault and
Length *width *height of test bench：
Engine before trial-manufacture operation process
Lift the engine with a gantry hanger and connect
the engine to the test bench suspended
By adjusting the screw height of the
To align the center of the engine fan to the center
Engine fan to the test bench front-end
hexagon bolts with flat gasket connection;
Front support connecting bolt: 2 M14*1.5*30
hexagon bolts with flat gasket and spring washer.
The inlet and outlet interface of the water tank
are connected to the engine respectively through
connection is checked to ensure that the engine
Connecting warm air joint:
of the water tank,
a high pressure pipe φ22mm is connected
which is mainly used for filling the antifreeze;
the pipeline connection is checked to ensure
after ignition without leakage.
assembly of the test bench.
Connect the exhaust end of the turbocharged
and fix firmly with a clamp.
and flameout cylinder.
Connect other pipeline harness,
and hold it firmly in position.
control panel to the bracket and flameout cylinder;
that the connection is reliable and correct.
Turn on the ignition key switch,
By controlling the hand-held throttle,
of the engine can be realized.
Read the meter value on the control panel,
on the vehicle: Test engine operation, readable
pressure, engine rotational speed and battery
Rotational speed 600rpm:
Rotational speed 1,000rpm:
oil pressure 0.6mpa,
oil pressure 0.65mpa,
After the engine has been running for 30 minutes,
turn off the ignition key,
lift the engine down,
Principle fault list
Determine whether the tested engine is running
value on the control panel after ignition.
Reason of rough idling
The first reason is the leakage of the intake system,
Air enters from the intake pipe and exhaust gas
to be too dense and too thin, causing the engine
the throttle and air inlet. Misalignment of
blocking phenomenon, it cannot filter the oil,
which makes individual cylinders work poorly and
Fuel pressure fault. When the oil pressure is too
decrease of fuel-injection quantity; When the oil
quantity increases, which causes too thick mixture.
the failure of valve actuating mechanism
decrease too much and the power is unbalanced.
have too much carbon deposit, causing valve seal
piston-connecting rod mechanism,
pressure to be inconsistent with faults.
Exhaust system blocking
When the three-way catalyst causes local or
deposition and fragmentation, it will increase
pipe vacuum too low, and cause the engine exhaust
sufficient. As a result, the working performance of
Air intake problems may also cause computer
ruled out for a long time, it will make the oxygen
accelerate the damage of the oxygen sensor, and
Reason of high-water temperature
the coolant consumption in the water tank is slow,
check the coolant, the water tank is short of water
Some car owners find that the water temperature
no leak in the water pipe. This kind of fault may
cooling system cannot carry on a general
Water pipe leakage
In the course of driving, if finding out where
pipe aging and breakage. It is easy to find it,
pipe at the maintenance shop.
Some car owners directly use water as coolant.
to water rust in the engine and water tank, the
high water temperature. Solving this problem is
the water tank.
The water pump is the core part of cooling system
car are blade-type. After working for a long time,
the water system does not circulate and the water
Cylinder mattress is deformed
temperature of the car, but actually there was
a small amount of cooling water enters into the
engine cylinder mattress. In this situation, the
so there will be a water shortage in the water
and the water temperature is high.
the rotation of the electronic fan. If the electric fan
The water temperature sensor on the car controls
If the water temperature sensor is faulty and there
temperature will be rose.
of the whole car. If the line is faulty,
Reason for low voltage：
The long-term idle car is the first reason to cause
internal structure, specific gravity, temperature
battery will often self-discharge, and will usually
If the car is not used for a long time, it will easily
to continue charging.
designed as lean liquid type. The moisture in the
lead sulfate will be gradually formed. After the
sulfated, recharging the battery cannot restore
chemical reaction, its main principle is to store
When the discharge is required, the chemical
Therefore, the battery has a service life limit due
battery is basically only 300 times of charging
almost the same, the voltage will be too low.
Oil viscosity is too large
friction resistance when the oil flows. The oil
When the engine temperature is low, the viscosity
temperature is high, the oil viscosity is small. When
leakproof is good, and the leakage amount is small.
the flow resistance of the oil in the lubrication
will be increased. This shows that the engine
the oil pressure will be high. Because the oil grade
suitable for the ambient temperature. For example,
or the oil fine filter block the lubricating oil to flow.
It shows that the flow resistance of the lubricating
reciprocal of the parallel branch oil flow resistance.
the connecting rod journal, the crankshaft journal
part is too small and the filter element of the fine
the pressure of the pressure limiting valve is
lubricating oil circuit will be increased and the
The pressure of the pressure limiting
of the pressure limiting valve, the pressure limiting
to limit the oil pressure, and the oil pressure does
documents. When the oil pressure exceeds the
spring by the spring force of spring to relieve
lower than the spring force, the valve is closed with
the specified range. From this point of view,
on the spring force of the spring. If the adjusted
system will be too large.
When the oil filter is clogged and the oil cannot be
is opened and the oil will directly flow into the main
pressure of the safety valve is too large, it cannot
Therefore,if the pressure of the oil pump is
and the oil supply to the main oil passage is
pressure. It should be always kept the oil filter
safety valve correctly (it is generally 0.35-0.45Mpa);
surface of the grinding steel ball with the valve seat
Reasons for low intake pressure
or not, if there is air leakage on the system or not,
Oil and gas separator is blocked
Due to more or less impurities in the oil system,
for a period of time, which will increase the
element and affect the normal operation.
element in time according tothe signal displayed
Air filter is clogged
The air filter is to filter the inhaled air to ensure
clean. If the air filter element is clogged, it will
Therefore, it is necessary to replace its filter
Pressure regulator is malfunctioned or damaged
The pressure regulation system is to automatically
gas used by the customer in order to achieve a
it is necessary to replace the damaged pressure
pressure regulator in time.
The intake valve is to control the amount of intake
the intake valve is fully open. When the amount of
air volume adjusting will input compressed air to
the intake valve, which will reduce the intake air
failure will affect the load on the unit.
will prevent the intake valve from opening