injection diesel-mecanique

Diesel: Self-Ignition Engine Sucks in Air and Strongly compresses

Diesel principle

Power circuit

Preheating circuit

Injection pumps

TP 1: Periodic interviews with the diesel engine

TP 2: repair the diesel power circuit

TP 3: Disassembly, control, repair, assembly and adjustment of an injector

TP 4: Check and repair the cold starting circuit

TP 5: Remove and rest the injection pump

TP 6: controls and settings

Diesel injection system

Diesel injection system

- Control on the different elements of a rotary injection pump;

- Disassembly and reassembly of a rotary injection pump

- Questions and problems

- Real or simulated cases or representative vehicles

The diesel engine is a self-turnout engine that only aspires air and compresses it strongly. This process makes it possible to obtain compression significantly higher than that of the fuel engine sensitive to rattling and using a mixture of air and fuel and a controlled ignition.

Characteristics of a diesel engine

Advance at the opening of the admission (AOA)

Delay when closing the admission (RFA)

Ignition advance (AA)

Advance at the opening of the exhaust (AOE)

Delay in the exhaust closure (RFE)

Real diagram

Advantage of the diesel engine

Diesel engine disadvantages

Power circuit

Fuel filter

Power pump

Injection pump

Cruise control

Advanced

Discharge pipe

Injectors

Different types of power circuits

Power circuit with online pump

"Suction" circuit

"Low pressure" circuit

Power circuit with distributor pump

air filter

Diesel filter

Filters with priming pump

Piping

Food pumps

Main types of food pumps

Membrane pump

Pump

Simple effect pump

Transfer phase

By turning, the camshaft of the injection pump leads the eccentric (1) in the high position. The piston (4) is pushed up by the pebble (2) and the stem (3). The displacement of the piston causes the valve closure (6) under the effect of the pressure of the fuel in the room (7), the valve (8) deviates from its seat, the diesel contained in the room (7) flows to the room (9) It is the transfer phase.

Self -regulator

The flow of the power pump being higher than the flow repressed by the injection pump, there is a time when the pressure in the room (9) is equal to the pressure of the spring (5) on the piston (4); This can no longer move, there is no longer any aspiration or repression: this is the self-regulating phase. Recall that the roller (2) is still in contact with the eccentric (1) via a recall spring not appearing on the diagram.

Left aspiration. In the center: Transfer phase. Right: self -regulating phase.

1. Excentrics on the camshaft of the injection pump; 2.Galet; 3.tige; 4.piston; 5. Resort; 6.A intake; 7. Chamber; 8.Clapet of discharge; 9. Transfer chamber.

1. Excentrics on the camshaft of the injection pump; 2.Galet; 3 .tige; 4.Indessing admission; 5.piston; 6. Chamber of admission; 7. 8. Compression chamber; 9. Resort; 10.Clapet of discharge; 11. Chamber; 12. Retraisal valve; 13. Transfer bed

Injectors

Injectors types

a) Injector with nipple and strangulation b) holes injector.

1. Arrivée, 2.Corps-support, 3. Fixing, 4. Intermediate Disk, 5. Injector, 6.Crou-Rraccord de Retoulement, 7.Filtre-Tige, 8.Canai for recovery of leaks, 9.rondelles of tape, 10. Retoulation level, 11.ressort, 12.Tige-pose, 13.

Types of injectors.

a) Netherlands injector and strangulation,

b) Holes injector.

1. Pressure stretch, 2. injector corps,

3. Injector help, 4.

5. Compression chamber, 6.

7. injection stretch, 8.

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