Diesel engine
- 1 - oil pan;
- 2 - crankcase gasket;
- 3 - oil pump receiver;
- 4 - oil pump;
- 5 - water pump sealing ring;
- 6 - water pump;
- 7 - crankshaft gear;
- 8 - camshaft drive belt;
- 9 - intermediate pulley mounting bolt;
- 10 - lower camshaft drive cover;
- 11 - vibration damper;
- 12 - bolt for fastening the vibration damper to the crankshaft gear;
- 13 - crankshaft gear mounting bolt;
- 14 - generator drive belt;
- 15 - Upper camshaft drive cover;
- 16 - camshaft gear mounting bolt;
- 17 - washer;
- 18 - camshaft gear wheel;
- 19 - rear camshaft drive cover;
- 20 - top cover mounting post;
- 21 - intermediate pulley;
- 22 - water pump gear;
- 23 - oil filter;
- 24 - cylinder head;
- 25 - cylinder head mounting bolt;
- 26 - head cover gasket;
- 27 - cylinder head cover;
- 28 - oil filler cap;
- 29 - fuel pump drive gear;
- 30 - fuel pump drive belt;
- 31 - washer;
- 32 - Fuel pump drive gear mounting bolt;
- 33 - Fuel pump drive belt cover;
- 34 - cylinder head gasket;
- 35 - cylinder block;
- 36 - fuel pump gear;
- 37 - Fuel pump gear mounting bolt;
- 38 - high pressure fuel pump;
- 39 - Fuel pump mounting nut;
- 40 - high pressure pipelines
The diesel engines installed in the Audi 100 cars are five-cylinder and have much in common with the five-cylinder petrol engines of Audi. Since the diesel engine has no ignition system, to start the engine there is a glow plug in the combustion chamber of each cylinder, which heats the air in the cylinder. The heating time relay supplies current to the glow plugs both during and after starting the engine. The engines of the CM and OE models are also equipped with a cold engine starting device built into the high-pressure fuel pump 38 (THBD).
NC and 3D engines have an electric heating device in THBD to facilitate cold engine starting.
The pump creates high pressure (13–17 MPa), and fuel is supplied to the cylinders. The fuel injection pump regulator ensures fuel supply depending on the accelerator pedal position.
The combustion chamber is shaped in such a way that when compressed, the air in the cylinder swirls: this allows for better mixing of the injected fuel with air. A fuel filter is installed in front of the THBD, which traps contaminants and water.
During operation, THBD does not require maintenance. The pump is driven by a toothed belt 30 from the camshaft.
The diesel engine is equipped with an electromagnetic valve that stops the fuel supply when the ignition is turned off. When starting the diesel engine, when the key is turned in the ignition switch, voltage is supplied to this valve through the glow plug switch, and the valve opens the fuel line.