Diesel engine
- 1 - oil sump;
- 2 - crankcase gasket;
- 3 - oil pump receiver;
- 4 - oil pump;
- 5 - sealing ring of the water pump;
- 6 - water pump;
- 7 - gear wheel of the crankshaft;
- 8 - camshaft drive belt;
- 9 - a bolt of fastening of an intermediate pulley;
- 10 - lower camshaft drive cover;
- 11 - vibration damper;
- 12 - bolt for fastening the vibration damper to the gear wheel of the crankshaft;
- 13 - a bolt of fastening of a cogwheel of a cranked shaft;
- 14 - generator drive belt;
- 15 - top camshaft drive cover;
- 16 - a bolt of fastening of a cogwheel of a camshaft;
- 17 - washer;
- 18 - camshaft gear;
- 19 - rear camshaft drive cover;
- 20 - rack mounting the top cover;
- 21 - intermediate pulley;
- 22 - gear wheel of the water pump;
- 23 - oil filter;
- 24 - cylinder head;
- 25 - a bolt of fastening of a head of the block;
- 26 - head cover gasket;
- 27 - block head cover;
- 28 - oil filler plug;
- 29 - gear wheel of the fuel pump drive;
- 30 - fuel pump drive belt;
- 31 - washer;
- 32 - bolt for fastening the gear wheel of the fuel pump drive;
- 33 - fuel pump drive belt cover;
- 34 - block head gasket;
- 35 - cylinder block;
- 36 - gear wheel of the fuel pump;
- 37 - bolt for fastening the gear wheel of the fuel pump;
- 38 - high pressure fuel pump;
- 39 - fuel pump fastening nut;
- 40 - high pressure pipelines
The five-cylinder diesel engines fitted to the Audi 100 have much in common with Audi's five-cylinder petrol engines. Since the diesel engine does not have an ignition system, each cylinder has a glow plug in the combustion chamber to start the engine, which heats the air in the cylinder. The warm-up time relay supplies current to the glow plugs both during and after the engine has been started. CM and OE models are also equipped with a cold starter built into the high pressure fuel pump 38 (THBD).
NC and 3D engines have an electric heating device in the THBD to facilitate starting a cold engine.
The pump generates high pressure (13–17 MPa), and fuel is supplied to the cylinders. The injection pump regulator provides fuel supply depending on the position of the accelerator pedal.
The combustion chamber is shaped so that when compressed, the air in the cylinder swirls: this allows better mixing of the injected fuel with the 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 a solenoid 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, this valve is energized through the glow plug switch, and the valve opens the fuel line.
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