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Overview
Abbreviation VR6, used for engine AAA and ABV, means that the cylinders are V-arranged, although we are talking about with the engine configuration of the cylinder looks like a row of cylinders of the engine block. The first modification AAA VR6 engine displacement of 2.8 liters and 174 hp (128 kW) was first established in 1991. In 1994, as a result of the modernization drive was released with factory designation ABV displacement of 2.9 liters and 190 hp (140 kW). These motors differ from one another in diameter cylinders, the components of an integrated management system of the engine and the fuel used. Since this engine family is quite different from the other, mounted on a vehicle of this series, will now be a brief description of the characteristics of their design and repair. Many systems and structural elements of the engine used in other engines.
| Fig. 2.54. Elements of the chain drive camshafts Engine VR6: 1 - an asterisk; 2 - lead distributor of ignition; 3 - bolt 10 Nm; 4 - axle, 25 Nm; 5 - shoe tensioner; 6 - double-row chain tensioner, 20 Nm; 7 - two-row chain; 8 - two-lane drive sprocket chain; 9 - driven sprocket-row chain; 10 - single-row chain tensioner; 11 - bolt 11 Nm; 12 - single-row chain sprocket (made integrally with the crankshaft); 13 - Single-row chain; 14 - Strap pacifier-row chain; 15 - finger 25 Nm; 16 - finger with a shoulder 25 Nm; 17 - bolt 20 Nm; 18 - two-row chain strap pacifier; 19 - a flange of the intermediate shaft; 20 - an intermediate shaft
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The design feature of timing VR6 engine is the fact that in their design back to the engines are widely used in earlier editions of the timing chain. It contains two strands: the first connects the two sprockets timing to the intermediate shaft, the second - the intermediate shaft to the crank (Fig. 2.54). Due to this arrangement, the camshaft drive sprocket has a smaller diameter, so the cylinder head more compact.
| Fig. 2.55. A general view of the motor partially sectioned VR6
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Special attention should also a method of supplying a fuel mixture, as by using a mixture of the cylinder head must be supplied to the two rows of cylinders. Since this engine has been designed for transverse blowing, that is intake ports are located on one side and outlet channels - to the other, this would mean that the fuel mix should reach three cylinders on one side and a three - to another. Air inlet duct located in the upper part of the cylinder head, from there to the cylinders are separate inlets. Three of these pipes are suitable directly to the cylinders at the front of the engine. Three other nozzle passes over the motor and service cylinders on the rear of the engine. Each of the inlets equipped with an electromagnetic injector. Spark plugs are located on the outer side of the cylinder (see. Fig. 2.55). The components of the cylinder head shown in Fig. 2.56 and 2.57.
| Fig. 2.56. The upper part of the cylinder head 1 - spark plug cable with connectors and a cable guiding device; 2 - a cover of the distributor of ignition; 3 - valve cover; 4 - sealing the housing; 5 - the top of the intake manifold; 6 - bolt 25 Nm; 7 - a casing of the cylinder head; 8 - support the collector; 9 - nut 1 Nm
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| Fig. 2.57. The lower part of the cylinder head 1 - bolt 24 Nm; 2 - tensioner for the timing belt; 3 - the cylinder head bolts; 4 - cylinder head; 5 - a cover of a camshaft; 6 - double chain tensioner 20 Nm; 7 - the ignition distributor; 8 - bolt 25 Nm; 9 - cylinder head gasket
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