S-class W202 Mercedes

1993-2000 of release

Repair and car operation



W202 Mercedes
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
- 7. Ignition system
   7.2. Safety measures at repair of electronic system of ignition
   7.3. Ignition coils
   + 7.4. Spark plugs
   - 7.5. Device of a preliminary warming up of a diesel engine
      + 7.5.1. Check of the device of a preliminary warming up
      7.5.2. Device self-diagnostics
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes








b47c026d b47c026d


7.5. Device of a preliminary warming up of a diesel engine

GENERAL INFORMATION

The device of a preliminary warming up consists of the relay of management of a warming up of candles of an incandescence, 4/5-rod candles of an incandescence and a control bulb of a warming up on the dashboard. In the cold engine only the compression has not enough for fuel ignition therefore the engine should be warmed up.

Duration of a warming up depends on ambient temperature and copes by means of the relay of management of a warming up.

At malfunction of candles of an incandescence or a tokopodvodyashchy feeding wire of the relay of management of a warming up disconnect the incandescence device. Glow plugs are provided with electrotension by means of the parallel scheme.

If the ignition key remains in the provision of a warming up without engine start-up, the safety scheme of the relay of management of a warming up later disconnects 20-25 seconds the incandescence device. For warming up renewal the ignition key at first should be established in 0-situation.

At turning on of the device of an incandescence through each glow plug the current about 30 A.Blagodarya to an adjusting winding current consumption by a candle proceeds at increase in temperature A.Tem samym a glow plug is limited till 8-15 protected from an overload.

The rod glow plug consists generally of the case with a vpressovanny heating core. The heating core in turn consists of included consistently heating and adjusting winding. When giving tension the heating winding strongly heats up. After 9 seconds of time of an incandescence the temperature of a heating core makes 900°C, and 30 seconds later the maximum temperature reaches 1180°C.

For improvement of the characteristic of warming up of the engine idling, further warming up at the working engine depends on temperature of cooling liquid. Time of repeated warming up at the engine in volume of 2,0 l makes at most 17 seconds. At engines in volume of 2,2/2,5 l repeated warming up reaches till 3 minutes; at refusal of a temperature-sensitive element of the cooling liquid connected with repeated warming up, duration of the last makes 30 seconds.

Maximum time of a prestarting warming up of the engine in volume of 2,2/2,5 l

TEMPERATURE OF COOLING LIQUID
MAXIMUM TIME OF THE PRESTARTING WARMING UP
– 30 ° With
16 seconds.
– 20 ° With
12 seconds.
– 10 ° With
7 seconds.
0 ° WITH +30 ° WITH
6–4 seconds.