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
- 8. Fuel system
   + 8.1.1. Introduction
   + 8.2. System of injection of petrol engines
   - 8.3. System of injection and food of diesel engines
      8.3.2. Check / control of the beginning of supply of fuel by the pump
      8.3.3. Nozzles
      8.3.4. Specifications of system of injection and diesel engine food
      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. Electroschemes








b47c026d b47c026d


8.3.3. Nozzles

GENERAL INFORMATION

Faulty nozzles unscrew in turn, weakening cap nuts on топливопроводах a high pressure while the engine works in an idling mode at fast turns. If frequency of rotation of the engine after weakening of a cap nut remains to a constant, it indicates malfunction of a nozzle.

The repair truck can check a stream of injected fuel and pressure of injection of a nozzle in limits from 100 to the 125th bar 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;
 – engine capacity falling;
 – excessively strong black dense smoke in exhaust gases;
 – high consumption of fuel;
 – the strengthened blue smoke at start-up of the cold engine

Removal

ENGINE OF 2,0 L

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

р8а. 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, 13а. Fixing bolts, 25 N of m.
16. Damper of a regulator of frequency of rotation of the fuel pump of a high pressure
Only in case of a mechanical transmission
19. A fixing bolt, 45 N of m (has the left carving)
54–57. Toplivoprovoda of a high pressure, 10–20 N of m.
78. Sealing ring
Each time is replaced
80, 82, 83. Toplivoprovoda (At type 202 топливопроводы get together with high-speed locks)
023. A blocking bolt (tool)
For blocking of the fuel pump of a high pressure
027. Shlitseva key (tool)
For turn of the fuel pump of a high pressure in the disassembled condition


PERFORMANCE ORDER
1. Remove a cross-section pipe of the air filter.
2. Clean топливопроводы outside.
3. Unscrew топливопровод the high pressure (54), connecting a nozzle and the fuel pump of a high pressure, remove the holder, having removed spring clips, and put it aside. Thus do not change the bent form топливопровода.
Prevention

For an otvorachivaniye of cap nuts on топливопроводах a high pressure the open ring wrench, the HAZET 4550-14 type with 1/4 drive and the extension piece is required. 1/4 means that the 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 plum of 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 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 condensing plug (109) into a carving ring (112).
3. Screw in a nozzle (114) and hardly tighten it with the moment of 30 N of m. In addition represented details: 70-a cylinder head, 71 – laying of a head of the cylinder, 110 – the prechamber.
4. Get the pipeline for plum filtering топлива.15. Screw pipelines of a high pressure on a nozzle and the pump and fix the holder spring clips.
5. Build in a cross-section pipe of the air filter.

ENGINES OF 2,2/2,5 L

Removal

PERFORMANCE ORDER
1. Remove a cross-section pipe of the air filter.
2. Unscrew a casing (6/1) covers of a head of the cylinder.
3. By means of suitable nippers pull on nozzles pipelines for plum of filtering fuel.
4. Unscrew from nozzles and the pump of nozzles топливопроводы a high pressure, remove from the holder spring clips and put aside. Thus do not change the bent form топливопровода.
Prevention

For an otvorachivaniye of cap nuts on топливопроводах a high pressure the open ring wrench, for example, HAZET 4550-14 is required.


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 the moment of 40 N of m.
3. Get pipelines for plum of filtering fuel.

ENGINE IN VOLUME OF 2,2 L

PERFORMANCE ORDER
1. Screw on a nozzle and the pump (10) with the moment of 10-20 N of m (rough value) топливопроводы a 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-section pipe of the air filter.

ENGINE IN VOLUME OF 2,5 L

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