In the fuel system of a diesel car, the quality of the high-pressure fuel pump (TNVD) plays an important role . Bosch is a world famous company. Under this brand, high-quality spare parts for various car models are produced. Of course, the cost of goods of this company is higher than that of Chinese competitors. But you can’t save on fuel injection pumps.
The task of the unit is to create the pressure necessary for the productive operation of the motor. If you hear noises when starting the engine, and fuel consumption increases significantly, contact a service center and go through the diagnostics.
If water could get into the system, as well as when using low quality fuel, you need to adjust the Bosch fuel pump. A similar procedure will be required if the pump pressure is insufficient, as well as if the nozzles are worn or badly clogged and work improperly. If the plunger pair is defective, it will need to be replaced. It is worth paying attention to the fact that often because of the breakdown of one part, nearby ones also suffer. Therefore, in the presence of even minor malfunctions, it is better to carry out appropriate diagnostics in a good car service.
Bosch injection pump adjustment should also be done if you find that the fuel is leaking. If this problem is left unattended for a long time, a long and expensive repair may be required. If the tightness is broken, this leads to a decrease in pressure. And this problem affects the performance of the pump and can even lead to the ignition of the motor.
If Bosch high-pressure fuel pump repair was required, then it is necessary to make adjustments after it. It is performed using a special stand, which with high accuracy measures the angles of the preliminary stroke of the plunger pair, determines the beginning of the fuel supply and other important characteristics.
Such work can only be carried out using specially designed equipment. And, of course, do not trust such work to amateurs.
Bosch fuel pump - a device that requires professional handling. It is better to check it at the stand. If you still decide to adjust the device yourself, first rinse it with a special tool. This is necessary in order to remove mud deposits and make the inner surface even.
Then you need to check the timing advance marks. To do this, unscrew the valve and check it. The part must be in the closed position. Use a hammer to lightly tap the top of the valve. To close the bypass hole, cage the inside.
The next step is the adjustment of the cyclic feed of the Bosch fuel pump. It is necessary to unscrew or vice versa - screw in and tighten the lock nut (if necessary). Then adjust the idle speed. This is done in the same way as with the cyclic feed. The norm is considered to be the interval from 770 to 780 rpm. The final stage is the adjustment of the hydraulic corrector. The thrust decreases when the pin is turned counterclockwise.
As you can see, you can do this work yourself. But the ideal option is to entrust it to specialists.