Therefore, these motors are also called 6V. Engines are cooled with coolant. The engines are located in the engine compartment along the axis of the vehicle.
The cylinder block is made of gray cast iron, and the cylinder head is made of aluminum alloy and is bolted to the cylinder block. 125 hp engine block only made of aluminum alloy. An oil pan is attached to the bottom of the engine block, into which oil flows, which is necessary for lubricating and cooling the engine.
Gasoline engines and the 2.5-I-TDI diesel engine use a cross-flow pattern in which air enters the engine cylinders from one side of the engine and exhaust gases are exhausted from the other side of the engine. With this engine design, cylinder filling and more efficient gas exchange are significantly improved, so that the energy of the air-fuel mixture is used most efficiently.
Engine 1.8-I. Each engine cylinder has three intake and two exhaust valves. The valves are driven by two camshafts. One camshaft controls the intake valves and the other camshaft controls the exhaust. The camshaft that controls the exhaust valves is driven by a toothed belt from the crankshaft pulley. The camshaft that controls the intake valves is driven by a chain from the camshaft that controls the exhaust valves.
Diesel engine 1.9-I-TDI. The camshaft mounted in the cylinder head is driven by a toothed belt from the crankshaft pulley. To supply fuel to the engine cylinders, a high-pressure fuel pump is used, flanged to the side of the cylinder block and driven by a toothed belt.
Diesel engine 2.5-I-TDI. This is an engine developed by AUDI and first installed in the A6. Each engine cylinder has two intake and two exhaust valves. Each section of the cylinder block has two camshafts. The camshaft that controls the intake valves is driven by a toothed belt from the crankshaft pulley. The camshaft that controls the exhaust valves is gear-driven from the camshaft that controls the intake valves. The fuel pump is driven by a separate toothed belt.
Engines 2.4- and 2.8-I. On the V6 gasoline engine, as well as the 1.8-I engine, three intake and two exhaust valves are installed on each cylinder. Each section of the cylinder block has two camshafts. The camshaft that controls the exhaust valves is driven by a toothed belt from the crankshaft pulley. The camshaft that controls the intake valves is driven by a chain from the camshaft that controls the exhaust valves.
All engines. The intake and exhaust valves are controlled by the camshaft via hydraulic tappets. Valve clearance adjustment is automatic using hydraulic tappets and no manual adjustment is required.
To supply oil to the rubbing surfaces of the engine, an oil pump is used, which is located in the oil pan. On a V6 petrol engine, the oil pump is mounted on the front side of the cylinder block. On the V6 TDI engine, the oil pump drive chain also drives the balance shaft, which reduces unwanted engine vibrations.
Water pump on 150 HP engines attached to the side of the engine block. The water pump is driven by a separate belt. The wide V-ribbed belt also drives the alternator, power steering pump and, if equipped, the air conditioning compressor. On 125 hp engines. and the V6 water pump is located at the front of the engine and is driven by a toothed belt. Keep in mind that the engine cooling system should be filled year round with a mixture of antifreeze and water with a low lime content.
The preparation and ignition of the air-fuel mixture in the engine cylinders is carried out by the engine control system, which does not require adjustments. The ignition timing and idle speed are controlled by the engine management system.
Attention. The electrically driven fan may also turn on after the ignition is turned off. Therefore, when working on a hot engine, for the duration of the work, it is necessary to disconnect the electrical connector from the fan motor.
Pic. 2.1. Engine 1.8-I
1 - camshaft that controls the exhaust valves,
2 - camshaft that controls the intake valves,
3 - hydraulic pusher,
4 - toothed belt,
5 - roller of the toothed belt tensioner.
Tension roller with pneumatic shock absorption.
6 - vibration damper,
7 - visco clutch hub,
8 - power steering pump,
9 - generator pulley,
10 - piston,
11 - suction pipeline,
With piping length changeover valve.
12 - dipstick for measuring the oil level,
13 - fuel pressure regulator,
14- fuel injector,
15 - chain.
With hydraulic tensioner and camshaft relative rotation mechanism.
Pic. 2.2. Petrol engine V6 2.4-I/ 2.8-I
1 - camshaft that controls the intake valves,
2 - hydraulic pusher,
3 - chain,
With hydraulic tensioner and camshaft relative rotation mechanism.
4 - camshaft that controls the exhaust valves,
5 - dipstick for measuring the oil level,
6 - flywheel,
7 - starter,
8 - generator,
9 - oil pan,
10- oil pump drive chain,
11 - damper (vibration damper),
12 - oil filter,
13 - air conditioning compressor pulley,
14 - radiator fan with visco clutch,
15 - V-ribbed belt,
16 - toothed belt,
17 - power steering pump pulley,
18 - ignition coil,
19 - suction pipeline,
With piping length changeover valve.
Pic. 2.3. Diesel engine 1.9 TDI
1 - nozzle,
2 - camshaft,
3 - oil filler cap,
4 - toothed belt,
5 - fuel pump pulley,
6 - piston,
7 - V-ribbed belt,
8 - crankshaft,
9 - power steering pump,
10 - radiator,
11 - oil pump,
12 - oil filter,
13 - dipstick for measuring the oil level /
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