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Audi 80/Avant (B4)since 1991-1995 releaseRepair and operation of the car |
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Audi 80/Avant + Technical specification - Engines Basic elements Lubrication system Ventilation of a case Visual check of the engine Running in of the new engine Engine service life Nominal and maximum frequency of rotation Restriction of frequency of rotation Measurement of pressure of compression List of malfunctions Provorachivaniye of the engine Hydraulic pushers Works on the GRM gear belt List of malfunctions Removal and installation of a head of the block of cylinders Removal and installation of the engine + System of production of the fulfilled gases + Cooling system + Fuel tank and fuel pump + Air filter and airintaking channels + System of injection + Coupling + Transmission and transmission + Suspension bracket and steering + Brake system + Anti-blocking system of brakes + Wheels and tires + Body electrical system + System of ignition + Lighting + Signalling devices + Devices and auxiliary devices + Heating and ventilation + body Elements + Search of malfunctions + Specifications |
Basic elements Who is interested in operation of the engine, will find the short description of the major parts before we pass to repair work and servicing below. Pistons, rods and cylinders In the top third of each piston in the corresponding flutes it is elastic three piston rings are inserted. They, amortiziruya, press on a cylinder wall. Both top piston rings do not pass gases from the combustion chamber down in a case while the lower oil scraper piston ring prevents excessive hit of greasing from a case in the combustion chamber. Cranked shaft The problem of a cranked shaft consists in transforming the rectilinear movement of the pistons going in the cylinder up and down to a rotary motion. Head of the block of cylinders and camshaft The head of the block of cylinders in a sense represents the upper bound of combustion chambers. Hydraulic pushers The drive of valves by means of a hydraulic pusher: the oil which is under an elevated pressure is designated in the red color. Light-red color means the amount of oil not necessary for the drive of valves.
Hydraulic regulation of a gap in valves is built in already mentioned dish-shaped hydraulic pushers. This device leads to that control of a gap necessary earlier in valves can be not carried out now: the drive of valves works without gaps, the dense prileganiye of the closed valves on a valve saddle and by that faultless tightness is and still provided.
Action of hydraulic pushers At the closed valve oil from lubricant system of the engine gets through a ring groove to a dish-shaped pusher. After passing of the backpressure valve in a pusher greasing gets to a chamber of a high pressure empty still and completely fills it. Gear belt Passing of a gear belt in the 6-cylinder engine
The gear belt set in motion by a cranked shaft is almost silent element of the drive of a camshaft. Gear belts 4-and the 5-cylinder engine are equipped with so-called thermosensitive tension rollers. Drive of a gear belt of the 4-cylinder engine
Drive of a gear belt of the 5-cylinder engine
The gear rubber belt reinforced by a steel wire works without wear, besides rubber mix of a gear belt provides dry greasing of pulleys. Along with a camshaft the gear belt puts in action at models with 5-and 6-cylinder engines including the pump of cooling liquid. On models with 4-cylinder engines the belt in addition gives a pomezhutochny shaft which in turn sets the oil pump and the distributor in motion. Laying of a head of the block of cylinders Laying between the block of cylinders and a head of the block of cylinders provides isolation from each other of combustion chambers and channels for cooling liquid and oil. Thus it has to resist to extreme fluctuations of temperature and pressure. |
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