Mercedes W124

since 1985-1995 of release

Repair and car operation



W124 Mercedes
+ Governing bodies and control devices
+ MAINTENANCE
+ 2. Maintenance (diesel engines)
+ ENGINE
+ 4. Repair of 6-cylinder petrol SOHC engines
+ 5. Repair of 6-cylinder petrol DOHC engines
+ 6. Repair of the diesel engine established in the car
+ 7. Major maintenance of engines
+ COOLING SYSTEM
+ FUEL SYSTEM
+ 10. System of injection of BOSCH CIS-E fuel (KE-JETRONIC)
+ 11. System of injection of BOSCH HFM fuel
- 12. Fuel system of diesel engines
   12.2. General information
   12.3. Air filter
   12.4. Fuel level sensor
   12.5. Fuel tank
   12.6. Inlet collector
   12.7. Accelerator cable
   12.8. Fuel pump of a high pressure
   12.9. The pumping-up fuel pump
   12.10. Mechanism of adjustment of the moment of injection, asterisk of the fuel pump
   12.11. Moment of injection of the fuel pump of a high pressure
   12.12. Fuel nozzles
   12.13. Electronic control system of turns of idling (ELR)
   12.14. Electronic anti-detonation system ARA
   12.15. Electronic control system of the diesel engine
   12.16. System of protection of the engine from an overload
   12.17. Fuel thermostat
+ 13. Fuel system of diesel engines
+ SYSTEMS OF START, IGNITION
+ 15. System of ignition of 4-cylinder petrol engines
+ 16. System of ignition of four-cylinder petrol engines
+ PRESTARTING HEATING
+ TRANSMISSION
+ 19. Mechanical transmission
+ 20. Automatic transmission
+ POWER SHAFTS
+ BRAKE SYSTEM
+ SUSPENSION BRACKET
+ BODY
+ ELECTRIC EQUIPMENT
+ CHECK OF MALFUNCTIONS






12.12. Fuel nozzles

GENERAL INFORMATION

Prevention

At check of work of fuel nozzles never hold up hands or any part of a body under the stream of fuel leaving a nozzle. Fuel leaves a nozzle under a high pressure and can get into a body through skin. It is recommended to charge to the expert work on check of nozzles under pressure.


At operation of the engine there is a wear of fuel nozzles and after run of 100 000 km it is necessary to make repair or replacement of fuel nozzles. The expert should make check, repair and calibration of fuel nozzles.

For definition of a faulty nozzle it is necessary to be convinced that the engine is serviceable and level of a compression is identical in all cylinders.

Start the engine and warm up it to normal working temperature.

Weaken an union nut топливопрово yes on a checked nozzle. Note, whether engine turns changed. Make the same check on accelerated single to a course.

At a serviceable fuel nozzle obvious reduction of turns of the engine, being accompanied will be observed by its non-uniform work. If the checked nozzle is faulty, change of turns of the engine will be insignificant and will be gone, if there was earlier extraneous knock.

Removal


Prevention

At work with fuel nozzles observe purity.


Fuel nozzle

A–fuel nozzle;

B–laying;

C–pipeline of a high pressure;

D–returnable топливопровод;

E–cap


PERFORMANCE ORDER
1. Remove a weight wire from the accumulator.
2. Remove an inlet collector.
3. Clear area about fuel nozzles and connecting nuts топливопроводов (see drawing). Weaken a collar and remove a hose of return of fuel from a fuel nozzle.
4. Weaken the connecting nut fixing топливопровод of a high pressure to the top part of a fuel nozzle.
5. Weaken the connecting nut fixing топливопровод of a high pressure to the top part of the fuel pump of a high pressure. Unscrew connecting nuts and remove the pipeline of a high pressure. Protect nozzles and the pipeline of a high pressure from dirt hit.
6. Unscrew a nozzle and take it from a nest in a head of the block of cylinders.
7. Remove from a fuel nozzle laying, noting its arrangement.

Installation

PERFORMANCE ORDER
1. Establish new laying in a head of the block of cylinders. Screw in a fuel nozzle and tighten it the demanded moment.
2. Establish pipelines of a high pressure and fix them connecting nuts, having tightened them the demanded moment.
3. Connect a tube of return of fuel to a fuel nozzle and fix it a collar.
4. Connect a weight wire to the accumulator and check operation of the engine.