Ford Sierra

1982-1993 of release

Repair and operation of the car

Ford Siyerra
+ 1.2. Identification of the car
+ 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 high pressure
      + 4.2.4. Nozzles
      4.2.5. Glow plugs
      4.2.6. Check of a compression
      4.2.7. Removal of air 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 speed 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

a773976c Rotor fuel pump of high pressure


Scheme of a power supply system

1 – batcher,
2 – electromagnetic fuel valve,
3 – the pumping-up pump,
4 – pressure regulator,
5 – nozzles,
6 – a nozzle in a section,
7 – rotor and plunger knot of distribution of fuel in the fuel pump of high pressure

On a shaft of the pump two plunger couples giving under high pressure fuel to engine cylinders are established. Plungers receive progress due to impact on them of the figured profile located in the pump. The amount of the fuel given to cylinders is regulated by the batcher operated by a cable from an accelerator pedal. The corner of an advancing of injection changes depending on engine turns the mechanical centrifugal regulator which is built in TNVD.

For a stop of the engine there is an electromagnetic valve. At start of the engine on a winding of the valve voltage of +12 V moves, the valve opens and passes fuel to the pump and nozzles. At switching off of the engine, the turn of a key in the lock of ignition switches off the fuel valve and fuel supply is blocked. The fuel pump under high pressure via pipelines, gives fuel to nozzles which are established in a head of the block of cylinders about combustion chambers. Nozzles inject fuel into vortex cameras in which there is a fuel ignition. Nozzles represent the valve which opens with strictly certain pressure of fuel (110–120 bars). The spray which is on the lower end of a nozzle forms a torch of the sprayed fuel of the required form. The cut-off 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. Surplus of fuel after a cut-off filters along a needle, greasing it and, on the return pipeline is 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 the required form or there is a bad cut-off, the engine begins to work with vibration, there are strong mechanical knocks, smoking increases.


Pressure of injection is adjustable parameter. During operation of the engine of pressure of injection often falls therefore the nozzle needs to be checked periodically and if necessary to regulate. It should be noted that sprays from different models of engines are externally identical, but different characteristics have, in particular, the torch form therefore new sprays it is necessary to apply only those which are calculated on this model.

Two autonomous systems are applied to investment of start of the cold engine. One of systems at cold start-up supports the raised idling turns, before warming up of the engine. It consists of the thermal sensor installed 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, at the same time on the heated-up engine the normal mode of idling is set.

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

Failure even of one candle leads 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 the used fuel and lack of water in it.