The Volvo 380 heavy duty truck diesel engine does not start

1) The ambient temperature is too low. In the case of low temperature, the preheating of the diesel engine should be done, otherwise it is not easy to start.

2) Low starting speed. For the hand-cranked diesel engine, the speed should be gradually increased, and then the pressure reducing handle should be pulled to the non-decompression position, so that there is normal compression in the cylinder. If the pressure relief mechanism is not adjusted properly or if the valve is pressed against the piston, it will often feel like it is laborious to rock the car.

Its characteristic is that the crankshaft cannot rotate when it turns to a certain part, but it can be returned. At this point, in addition to checking the decompression mechanism, you should also check whether the timing gear engagement relationship is wrong. For the diesel engine using the electric starter, if the starting speed is extremely slow, most of the starter is weak, which does not mean that the diesel engine itself is faulty.

A detailed inspection of the electrical wiring should be carried out to determine whether the battery is sufficiently charged, whether the wires are connected tightly and whether the starter is working normally.

Reasons for the fuel supply system:

1) There is no oil in the tank or forgot to turn the tank switch on.

2) There is too much air or moisture in the fuel supply system. The phenomenon is that the starting speed is not low but does not catch fire, and white smoke comes out of the exhaust pipe. The inspection method is to loosen the air release screw on the diesel filter or the high-pressure oil pipe on the high-pressure pump, if there is air coming out, it means that there is air.

The method of elimination is to tighten the joints of the oil circuit, and then loosen the air release screw on the high-pressure pump, rotate the crankshaft, and remove the air. Moisture found in diesel fuel can also be removed in the same way. If there is too much moisture in the diesel, the diesel needs to be replaced.

4) The plunger of the fuel injection pump is worn, and the plunger should be replaced at this time.

5) The oil outlet valve of the fuel injection pump is stuck or the spring of the oil outlet valve is broken. The high-pressure oil pipe joint can be removed, the oil outlet valve and valve seat can be taken out and cleaned, and the oil outlet valve needs to be replaced when the oil outlet valve spring is broken.

6) The plunger spring of the fuel injection pump is broken, resulting in no pressure on the fuel injection pump.

7) The fuel injection pump plunger is stuck inside the plunger sleeve. When the oil circuit is normal and the plunger does not move when the crankshaft is shaken, it means that the plunger and the plunger sleeve are stuck. The fuel injection pump should be disassembled and the plunger and plunger sleeve should be cleaned.

8) The injector needle valve is stuck. The injector should be removed and the needle valve removed from the injector for cleaning, or the needle valve coupling should be replaced.

9) If the injection time is incorrect, the injection time should be re-calibrated according to the regulations.

1. Check the fuel injection pump connection device and fuel injection timing.

Start the motor to see if the input shaft of the fuel injection pump rotates and whether the coupling connection is reliable. If it does not rotate or rotates too slowly, check whether the coupling is broken, whether the semicircular keys of the main and driven disks are intact and whether the fixing screws are loose.

If the above items are normal, check whether the fuel injection is on time, and the inspection method is: remove the high-pressure oil pipe of the first cylinder, rotate the crankshaft, so that the piston of the first cylinder is at the beginning of the expansion stroke, and the pointer of the flywheel housing should be aligned with the 0 degree line on the flywheel (if the side cover plate of the fuel injection pump is removed, the plunger spring of the first cylinder should be in a compressed state); Reverse the crankshaft according to the direction of diesel engine operation, so that the pointing point on the inspection window is aligned at 15 degrees 25 degrees on the flywheel (equivalent to the specified angle value of the injection advance angle); Loosen the two fastening screws on the main and driven disc of the coupling of the fuel injection pump transmission shaft, and slowly and evenly rotate the fuel injection pump camshaft to the first cylinder outlet according to the rotation direction of the fuel injection pumpThe moment when the oil level has just fluctuated; Tighten the two screws on the main and driven disc of the coupling joint.

2. Check the low-pressure oil circuit.

First, check the diesel tank. If the switch can be turned on and there is enough fuel in the tank, check whether the tank vent is blocked; If it is unblocked, check the bottom of the tank for water or impurities.

Secondly, check whether the oil circuit is unblocked. If everything is normal in the oil tank, the pump oil test can be carried out by hand pump. If you feel no suction when you pull out the button, and feel strained when you press the button, it means that the oil circuit between the fuel transfer pump and the fuel injection pump is blocked, and the diesel filter should be checked to see if it is blocked; If you feel obviously struggling when pulling out the button, and the button automatically returns to its position after letting go, it means that the oil circuit between the fuel tank and the fuel pump is blocked, and the oil pipe should be checked to see if it is blocked.

If there is no normal pump oil resistance when pulling up and pressing the button, it means that the hand oil pump is faulty, and the oil outlet valve of the oil transfer pump should be checked first. Disassemble the oil pump to see if the spring is broken or the piston is damaged; If the environment is cold, also check whether the diesel used has wax at that ambient temperature.

Again, check if there is air in the oil circuit. If the oil circuit is unblocked, check whether there is air in the oil circuit, that is, let go of the exhaust plug on the diesel filter or fuel injection pump, pump the oil with a hand pump, if there are bubbles in the diesel fuel flowing out of the exhaust plug (that is, foamy diesel oil), it means that there is air in, and the oil pipe should be checked for damage and whether the pipe joint is loose.

If there is no damage or looseness, it should be deflated in sections, and the inspection method is: loosen the oil outlet joint on the oil pump, press the hand pump, and observe the discharge of diesel fuel. If the foam diesel is not exhausted, it means that the oil pipe between the fuel pump and the fuel tank or the oil inlet pipe in the fuel tank is ruptured or the pipe joint is loose; If the foamed diesel can be exhausted, the output joint of the diesel filter or the exhaust plug should be unscrewed, and then the exhaust test should be carried out to check whether the pipeline and joint are leaking.

The engine cannot be started, which is a problem that is easy to annoy, after all, when the whole machine cannot be operated, our purpose cannot be achieved, so it is still important to prevent problems before they occur, and daily inspection work is particularly important.

The battery power is insufficient, and the starting speed is not enough;

The oil pump is aging and leaking, and the oil supply is unreliable;

The cylinder is worn and leaking, and the cylinder pressure is insufficient;

Poor atomization of the grease nozzle, burning, no oil injection;

Computer circuit failure.

Hello, for this situation, it is mainly caused by the damage of the oil pump of the engine, this one needs to go to the repair shop to check whether the oil circuit is blocked, and at the same time check whether the oil pump is damaged.

First of all, let's see if the anti-theft system is working? For example, you can use a diagnostic computer to actively test and drive the fuel pump to see if there is a problem with the fuel pump itself.

If the Volvo car does not come with oil, the car cannot start the engine to check whether there is a problem with the oil pump.

Hello, this one will check the oil pump, fuel injector, and gasoline filter element replacement, it may be that the oil circuit is blocked.

In this case, it is necessary to be specific to detect what exactly causes this kind of problem.

If the Volvo car does not come with oil, it is recommended that it is best to check whether it is caused by the problem of the oil circuit or the problem of the oil pump.

Hello, this situation may be the gasoline pump damage, you can go to the 4S shop to check the specifics.

If the vehicle has insufficient fuel supply and cannot be ignited normally, it is recommended to consider checking whether it is caused by insufficient oil supply of the oil pump or blocked oil circuit.

The first is that the oil is not enough, the second may be that the pressure is not enough, and the third may be that the grease nozzle is blocked.

Hello, this is generally a problem with the battery or the starter, or the pressure of the oil pump is not enough.

Hello, this requires you to check whether the battery is out of power, followed by checking whether there is gasoline,

Big brother, what you said is too general, you can't, it's generally a problem with diesel and air.

Or there is a problem with your starting system, and the battery can't get up when the battery is out of power, there are too many reasons.

As a rule of thumb, it's time to change the diesel filter.

What is the model of Volvo.

Hit **, find after-sales. I'm Volvo after-sales, plus I will tell me the specific situation, I can give you some advice.

Is it not on fire or the starter does not react.

Hello, there are reasons why I can't play

1. Check that the battery has a 12-volt voltage, if the battery is not enough to take the battery, find a car to take the battery, and replace the battery after starting.

2. If the oil pump is depressurized, or the gasoline filter is too dirty and blocked, check whether the fuel pressure is normal, and replace the oil pump if it is abnormal.

3. The starter motor is broken, and the carbon brush is less conductive and cannot be started.

4. The crankshaft position sensor has too much carbon deposition or is broken, and the ignition and fuel injection signal is not normal (you can clean the crankshaft position sensor sludge to see if it is normal).

5. Ignition coil and throttle failure will also lead to occasional failure to start normally. There are many reasons for electrical failures, it is recommended that you go to the repair shop to read the fault code with a computer diagnostic instrument to confirm the fault point, and then repair it according to the above maintenance methods. 4S shop professional technician, 10 minutes to solve. 】