Audi 80/Avant (B4)
since 1991-1995 release
Repair and operation of the car
+ Technical specification
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
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
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Signaling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
Who is interested in operation of the engine, will find below the short description of the major parts before we pass to repair work and servicing.
Pistons, rods and cylinders
In the top third of each piston in the corresponding flutes it is elastic three piston rings are inserted. They, амортизируя, 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 lubricant from a case in the combustion chamber.
The problem of a bent shaft consists in transforming the rectilinear movement of the pistons going in the cylinder up and down to 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 pushersThe drive of valves by means of a hydraulic pusher: the oil which is under elevated pressure is designated in 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 the fact 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 lubricant gets to the camera of high pressure empty still and completely fills it.
Passing of a gear belt in the 6-cylinder engine
The gear belt set in motion by a bent shaft is almost silent element of the drive of the 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 lubricant of pulleys. Along with the 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. At the same time it has to resist to extreme fluctuations of temperature and pressure.