The engine block is made of gray cast iron. At the bottom of the cylinder block is a crankshaft supported by main bearings. Through connecting rod bearings and connecting rods, the crankshaft is connected to the pistons. From below, the engine is closed by a crankcase pan, in which oil is collected during operation, designed to lubricate and cool the moving parts of the engine. The cylinder head is made of light alloy and bolted to the cylinder block. Seats and valve guides made of steel are pressed into the cylinder head. The use of aluminum improves heat dissipation and reduces engine weight.
The cylinder head is made according to the so-called transverse purge pattern. This means that fresh air/fuel mixture enters from one side of the cylinder head and exhaust gases exit from the other side.
Petrol engines 1.0 and 1.2 l
3 or 4-cylinder DOHC engines have 4 valves per cylinder. The valves are driven by two camshafts via rocker arms. To compensate for valve clearances, hydraulic tappets are installed. The camshafts are driven by a chain.
The cylinder block consists of two parts connected by bolts. The upper part is made of gray cast iron, the lower part is made of aluminium. The lower part is the base for installing the crankshaft main bearings.
Petrol engines OHC 1.2 and 1.4 l
With an overhead camshaft. The camshaft through the rocker arm drives eight vertically arranged intake and exhaust valves. Hydraulic compensators automatically compensate for resulting valve clearances. Therefore, valve clearance adjustment is not required as part of maintenance. The camshaft is driven from the crankshaft via a toothed belt.
Gasoline engines DOHC 1.4 and 1.6 l
With two overhead camshafts, driving respectively two intake and two exhaust valves of each cylinder. Both camshafts are driven by a toothed belt. The valves are driven by hydraulic tappets. Valve clearance adjustment during maintenance is not required. The multi-valve design provides good filling of the cylinders and efficient removal of exhaust gases, which in turn ensures efficient use of fuel.
Diesel engine
The vertically positioned intake and exhaust valves are driven directly from the camshaft via poppet followers. As part of maintenance, valve clearance adjustment is required. The camshaft is driven from the crankshaft by a toothed belt.
An oil pump is used to lubricate the engine, mounted at the front at the bottom of the cylinder block. On gasoline engines, the oil pump is driven directly from the crankshaft, while on diesel engines it is driven by a toothed belt. Oil from the oil pan flows through holes and channels to the crankshaft and camshaft bearings, as well as to the cylinder walls.
coolant pump (water pump) on 4-cylinder petrol engines, it is located in the front of the cylinder block and is driven by a toothed belt. On DOHC 1.0 and 1.2 liter gasoline engines, the water pump is located in front of the timing case and is driven by
V-belt. The water pump of diesel engines is mounted on the side of the cylinder block and is driven by a V-belt.
For the preparation of the air-fuel mixture on gasoline engines, a central or distributed injection system is used. The diesel engines are equipped with a highly economical direct injection system with an electronically controlled injection pump driven by a toothed belt.
On gasoline engines, the spark to ignite the air/fuel mixture is generated by the electronic ignition system. Ignition timing adjustment is not required as part of maintenance.
Engines meet all modern requirements for the content of exhaust gases of toxic components.
The transmission of torque from the engine to the front wheel drive shafts is carried out by means of a 5-speed manual gearbox mounted on the left side of the power unit (RKPP), or 4-speed automatic transmission (AT), - see chapters for details Manual 5-speed gearbox and Automatic 4-speed transmission.
The brake system is equipped with a standard vacuum booster. All models use front wheel disc brakes and rear drum brakes. ABS is standard on most models.
Fully independent front wheel suspension consists of MacPherson struts and transverse lower wishbones. Rear wheel suspension - semi-independent with torsion beam and two trailing arms - see Chapter Suspension.
Steering - rack and pinion, with hydraulic booster, the steering mechanism is located behind the engine. The electro-hydraulic steering pump is mounted directly on the steering gear and requires no maintenance. The hydraulic fluid reservoir is built into the pump assembly - see chapter Steering.
Both series (Corsa B and Tigra) are equipped with full-size driver's airbags installed as standard equipment. Optional extras include side airbags. An engine immobilization system is used to protect against hacking. The head unit is equipped with a security code.
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