Audi 80/Avant (B4)
Since 1991-1995 of release
Repair and car operation
+ The description
Visual check of the engine
Обкатка the new engine
Engine service life
Nominal and maximum frequency of rotation
Restriction of frequency of rotation
Measurement of pressure of compression
The list of malfunctions
Проворачивание the engine
Works on gear belt ГРМ
The list of malfunctions
Removal and installation of a head of the block of cylinders
Removal and engine installation
+ System of release of the fulfilled gases
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
Who is interested in engine work, will more low find the short description of the major parts before we will pass to repair work and servicing.
Pistons, rods and cylinders
In the top third of each piston in 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 downwards in картер while bottom маслосъемное the piston ring prevents excessive hit of greasing from картера in the combustion chamber.
The problem of a cranked shaft consists in transforming rectilinear movement going in the cylinder upwards and downwards pistons to a rotary motion.
Head of the block of cylinders and camshaft
The head of the block of cylinders in a sense represents the top border of chambers of combustion.
Hydraulic pushersDrive of valves by means of a hydraulic pusher: oil being under an elevated pressure is designated by red colour. Light-red colour means the quantity of oil not necessary for a drive of valves.
In already mentioned тарельчатые hydraulic pushers hydraulic regulation of a backlash in valves is built in. This device leads to that the control of a backlash necessary earlier in valves can to be spent now: the drive of valves works without backlashes, is and still provided dense прилегание the closed valves on a valve saddle and by that faultless tightness.
Action of hydraulic pushers
At the closed valve oil from lubricant system of the engine gets through a ring groove in тарельчатый a pusher. After passage of the return valve to a pusher greasing gets in empty still the chamber of a high pressure and completely fills it.
Passage of a gear belt to the 6-cylinder engine
The gear belt set in motion by cranked shaft is almost silent element of a drive of a camshaft.
Gear belts 4 and the 5-cylinder engine are equipped by 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 deterioration, besides the 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 a cooling liquid. On models with 4-cylinder engines the belt in addition results помежуточный a shaft which in turn actuates the oil pump and the distributor.
Lining of a head of the block of cylinders
The lining between the block of cylinders and a head of the block of cylinders provides isolation from each other chambers of combustion and channels for a cooling liquid and oil. Thus it should resist to extreme fluctuations of temperature and pressure.