Ford Sierra

1982-1993 of release

Repair and car operation

Ford Siyerra
+ 1.2. Car identification
+ 2. Maintenance
+ 3. General data
- 4. Engines
   + 4.1. Petrol engines
   - 4.2. Diesel engine
      + 4.2.1. Technical characteristics
      4.2.2. Check and adjustment of gaps of valves
      - 4.2.3. Fuel system Rotor fuel pump of a high pressure
      + 4.2.4. Nozzles
      4.2.5. Glow plugs
      4.2.6. Compression check
      4.2.7. Air removal from fuel system
      4.2.8. Fuel filter
      4.2.9. Fuel pump, installation of the beginning of injection of fuel
      4.2.10. Adjustment of number of turns of idling
      + 4.2.11. The repair which is not demanding removal of the engine
+ 5. Coupling
+ 6. Transmissions
+ 7. Driveshaft and back bridge
+ 8. Steering
+ 9. Suspension brackets
+ 10. Brake system
+ 11. Body
+ 12. Electric equipment Rotor fuel pump of a high pressure


Power supply system scheme

2–electromagnetic fuel valve,
3–the pumping-up pump,
4–regulator of pressure,
6–a nozzle in a cut,
7–rotor плунжерный knot of distribution of fuel in the fuel pump of a high pressure

On a shaft of the pump two plunzherny pairs submitting under a high pressure fuel to cylinders of the engine are established. Plunzhera receive progress at the expense of impact on them figured profile located in the pump. The amount of fuel submitted to cylinders is regulated by the batcher operated by a cable from a pedal of an accelerator. The corner of an advancing of injection changes depending on engine turns the mechanical centrifugal regulator which has been built in TNVD.

For a stop of the engine there is an electromagnetic valve. At engine start on a winding of the valve tension +12 moves In, the valve opens and passes fuel to the pump and nozzles. At engine switching off, key turn in the lock of ignition switches off the fuel valve and supply of fuel is blocked. The fuel pump under a high pressure via pipelines, submits fuel to nozzles which are established in a head of the block of cylinders about combustion chambers. Nozzles inject fuel into vortical chambers in which there is a fuel ignition. Nozzles represent the valve which opens at strictly certain pressure of fuel (110–120 bar). The spray being on the bottom end of a nozzle, forms a torch of sprayed fuel of a demanded form. Otsechka of fuel is made by a needle under the influence of a nozzle spring. The spray and a needle are knot of precision accuracy and demand the accurate address at repair. Surpluses of fuel after an otsechka filter along a needle, greasing it and, on the return pipeline are taken away in a tank.

Serviceability and the correct adjustment of nozzles are very important for normal operation of the engine. If the spray of a nozzle does not provide a torch of a demanded form or there is a bad otsechka, the engine starts to work with vibration, there are strong mechanical knocks, the dymleniye raises.


Pressure of injection is adjustable parameter. During operation of the engine of pressure of injection often falls, therefore the nozzle is necessary for checking periodically and if necessary to regulate. It should be noted that sprays from different models of engines are outwardly identical, but have different characteristics, in particular, a torch form therefore new sprays should be applied only what are calculated on this model.

Two independent systems are applied to investment of start of the cold engine. One of systems at cold start-up supports the raised turns of idling, before engine warming up. It consists of a temperature-sensitive element established in a head of the block of cylinders, a cable in a cover and systems of levers on the fuel pump, On the cold engine the sensor tightens a cable, thereby, raising turns. When heating the working body of the sensor extends and releases a cable, thus on the heated-up engine the normal mode of idling is established.

The second system serves for improvement of ignition of fuel in cylinders at the moment of start-up. In vortical chambers of each cylinder glow plugs are established. Before engine start on them tension that shows fire of a control bulb on a combination of devices moves. Within several seconds of a candle are heated to high temperature and the control bulb dies away that serves as a signal for engine start. The heated candles lift temperature in the vortical chamber and facilitate fuel ignition. It should be noted that candles are disconnected not right after engine start, and after a while, allowing the engine to leave on a normal operating mode.

Failure even one candle conducts to the complicated start of the engine, with interruptions in work and strong vibration. The fuel system on diesel engines is usually very reliable. The main condition of normal and durable work is purity of used fuel and lack of water in it.