Mercedes of the S-class W202

1993-2000 of release

Repair and operation of the car



Mercedes W202
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Lubrication system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. System of ignition
- 8. Fuel system
   + 8.1.1. Introduction
   + 8.2. System of injection of petrol engines
   - 8.3. System of injection and power supply of diesel engines
      8.3.2. Check / control began fuel supply with the pump
      8.3.3. Nozzles
      8.3.4. Specifications of system of injection and power supply of the diesel
      8.3.5. Diagnostics of malfunctions of system of injection and food
   + 8.4. System of production of exhaust gases
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electrical circuitries






8.3.3. Nozzles

GENERAL INFORMATION

Faulty nozzles unscrew in turn, weakening cap nuts on fuel-supply lines of high pressure while the engine works in the idling mode on rapid turnovers. If the frequency of rotation of the engine after weakening of a cap nut remains to a constant, it indicates malfunction of a nozzle.

The auto repair shop can check a stream of injectable fuel and pressure of injection of a nozzle ranging from 100 to 125 bars and if necessary to make adjustment by means of replacement of an adjusting washer.

The first signs of emergence of malfunction in a nozzle:

 – interruptions in ignition;
 – detonation knock in one or in several cylinders;
 – engine overheat;
 – falling of engine capacity;
 – excessively strong black dense smoke in exhaust gases;
 – high consumption of fuel;
 – the strengthened blue smoke at launch of the cold engine

Removal

ENGINE OF 2,0 L

Fuel pump of high pressure (pump of nozzles) (engine of 2,0 l)

r8a. A bolt with not falling down washer or with not falling down lock element
10. Sealing ring of round section
It is always replaced, before installation it is greased
11. Carving stopper
13, 13a. Fixing bolts, 25 N. of m.
16. Damper of the regulator of frequency of rotation of the fuel pump of high pressure
Only in case of mechanical transmission
19. A fixing bolt, 45 N. of m (has the left carving)
54–57. Fuel-supply lines of high pressure, 10–20 N. of m.
78. Sealing ring
Every time is replaced
80, 82, 83. Fuel-supply lines (At type 202 get fuel-supply lines together with high-speed locks)
023. The blocking bolt (tool)
For blocking of the fuel pump of high pressure
027. Shlitseva key (tool)
For turn of the fuel pump of high pressure in disassembled state


PERFORMANCE ORDER
1. Remove a cross pipe of the air filter.
2. Clean fuel-supply lines outside.
3. Unscrew the fuel-supply line of high pressure (54) connecting a nozzle and the fuel pump of high pressure, remove the holder, having removed spring clips, and put it aside. At the same time do not change a curved form of a fuel-supply line.
Prevention

The otvorachivaniye of cap nuts on fuel-supply lines of high pressure requires an open ring wrench, the HAZET 4550-14 type with 1/4 drive and the extender. 1/4 means that length of the edging of a tetrahedral opening on an insert of a key makes 1/4 inches.


4. Remove from a nozzle pipelines for discharge of the filtering fuel (50). Extend a cap (52) from a nozzle of the fourth cylinder.
5. Unscrew a nozzle (30) by means of a face wrench of SW 37 supplied with very long nozzle.
6. If is available, extend the condensing plug.
7. Take laying of a nozzle (53).

Installation

PERFORMANCE ORDER
1. Establish new laying of a nozzle (113).
2. If is available, insert the condensing plug (109) into a carving ring (112).
3. Screw in a nozzle (114) and hardly tighten it with m 30 N.' moment. In addition represented details: 70 – a cylinder head, 71 – laying of a head of the cylinder, 110 – the precamera.
4. Spread the pipeline for the discharge filtering topliva.15. Screw pipelines of high pressure on a nozzle and the pump and fix the holder by spring clips.
5. Build in a cross pipe of the air filter.

ENGINES 2,2 / 2,5 L

Removal

PERFORMANCE ORDER
1. Remove a cross pipe of the air filter.
2. Unscrew a casing (6/1) of a cover of a head of the cylinder.
3. By means of suitable nippers pull on nozzles pipelines for discharge of the filtering fuel.
4. Unscrew from nozzles and the pump of nozzles fuel-supply lines of high pressure, remove spring clips from the holder and put aside. At the same time do not change a curved form of a fuel-supply line.
Prevention

The otvorachivaniye of cap nuts on fuel-supply lines of high pressure requires an open ring wrench, for example, of HAZET 4550-14.


5. Unscrew a nozzle (50) by means of a face key of SW27 with a long nozzle.
6. Take laying of a nozzle (50/6).

Installation

PERFORMANCE ORDER
1. Insert new laying of a nozzle.
2. Screw in nozzles and hardly tighten them with m 40 N.' moment.
3. Spread pipelines for discharge of the filtering fuel.

2,2 L ENGINE

PERFORMANCE ORDER
1. Screw on a nozzle and the pump (10) with m 10–20 N.' moment (approximate value) fuel-supply lines of high pressure from 55/1 to 55/4. To avoid a break of pipelines, it is necessary to establish fixing spring clips (56).
3. Establish a casing of a cover of a head of cylinders.
4. Establish a cross pipe of the air filter.

2,5 L ENGINE

PERFORMANCE ORDER
1. Screw on a nozzle and the pump (10) with m 10–20 N.' moment (approximate value) fuel-supply lines of high pressure from 55/1 to 55/5. To avoid a break of pipelines, it is necessary to establish according to the drawing fixing spring clips (56).
3. Establish a cylinder cover casing.
4. Establish a cross pipe of the air filter.