Audi 80/Avant (B4)
since 1991-1995 of release
Repair and car operation
+ Technical specification
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 engine installation
+ System of production of the fulfilled gases
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
Who is interested in operation of the engine, will find the short description of the major parts before we will 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, амортизируя, press on a cylinder wall. Both top piston rings do not pass gases from the combustion chamber down in a case while the bottom maslosjemny piston ring prevents excessive hit of greasing from a case in the combustion chamber.
The problem of a cranked shaft consists in transforming rectilinear movement going in the cylinder up and down 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: the oil which was under an elevated pressure is designated by red color. Light-red color means the amount of oil not necessary for a drive of valves.
Hydraulic regulation of a gap is built in already mentioned tarelchaty hydraulic pushers in valves. 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 tarelchaty pusher. After passing of the return valve in a pusher greasing gets in empty still the chamber of a high pressure and completely fills it.
Passing of a gear belt in the 6-cylinder engine
The gear belt actuated by cranked shaft is almost silent element of a 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 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 cooling liquid. On models with 4-cylinder engines the belt in addition gives a pomezhutochny shaft which in turn actuates the oil pump and the distributor.
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 chambers of combustion and channels for cooling liquid and oil. Thus it should resist to extreme fluctuations of temperature and pressure.