Audi A4, S4
Since 2000 of release
Repair and car operation
Audi A4, S4
+ Controls and receptions of safe operation
+ Current leaving and service
+ The engine
+ Systems of cooling, heating and the air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
- Systems of an electric equipment of the engine
- Ignition and engine management system
The basic data and security measures
Checks of a control system by ignition and injection
Search of malfunctions - the general information and preliminary checks
Check and adjustment of a corner of an advancing of ignition
+ System of preheat of the diesel engine
+ Diagnostics of systems of electronic control and the diagnostic equipment
+ Gymnastics and start systems
+ Manual box of a gear change
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
The general description
The spark plug consists of the central electrode, an insulator with the case and an electrode (ов) weights. Between the central electrode and a weight electrode the spark igniting fuel-air a mix slips. It is not necessary to apply the spark plugs which are distinct from the recommended. The recommended type of candles is defined among other калильным by number.
The kalilnoe number characterises degree of thermal loading of a candle. The more low калильное candle number, the above degree of its thermal loading. Thus the candle takes away heat thanks to what possibility калильного ignitions of a fuel mix is excluded is better. The candle with the high thermal characteristic has that lack that its temperature of self-cleaning lies above. It is more inclined to deposit formation, in particular when the engine in an operating time often does not reach the working temperature, for example movement in a city, short trips in the winter.
Correct калильное the candle number is defined by the manufacturer of the car. There are candles with one or several electrodes of weight, with various length of a carving and its diameter. At candle replacement it is necessary to establish only the candles corresponding to requirements of the manufacturer of the car.
Average service life of a candle is distinguished. Thus the serious role is played also by a material of electrodes. Chrome-nickel an alloy is characterised by very high heat conductivity and high corrosion firmness. The best heat conductivity silver possesses, and platinum electrodes possess high corrosion firmness and firmness against обгорания. Service life of candles of run of 100000 km.
Depending on a design of engines distinguish two types of consolidation between spark plugs and a head of cylinders.
Flat consolidation has an external sealing ring which is not lost and is fixed on the candle case. At конусном consolidation it is not required additional sealing elements. At the limited space for installation, candles with a flat landing surface and the small size on a turn-key basis are in most cases applied. Candles with a conic landing surface thanks to a compact design have the smaller sizes.
Spark plugs it is necessary to change each 60 000 km of run, address to the Head Current leaving and service.
On appearance of a candle it is possible to draw a conclusion on work of candles, quality management of a mix and an engine condition (pistons, piston rings etc.).
At ввинчивании candles watch, that they have not been drawn, as the sealing washer can be damaged. Do not exceed the moment of a tightening specified in Specifications.
Too early ignition
Short circuit of electrodes
Candle normal state