Mercedes Benz Actros
Fuel Circuit - Engine OM501LA
I Fuel delivery pump
II Injection nozzle
III Fuel filter
IV Unit pump
V MR control unit
VI Pressure holding valve
- Through prefilter from fuel tank
- Check valve
- Leak oil
- From unit pumps
- To unit pumps
- To fuel delivery pump
- To fuel filter
- To injection nozzles
- Draining filter and flowback of leak oil
1 Fuel tank
1.1 Fuel strainer (800 µm)
2 Manual fuel feed pump
2.1 Fuel prefilter (300 µm)
For vehicles without code (K81)
Fuel prefilter without heated water separator
2.2 Fuel prefilter (10 µm)
For vehicles with code (K81)
Fuel prefilter with heated water separator
3.1 Assembly valve in fuel feed (opened by pressure)
3.2 Assembly valve in fuel return flow (opened by pressure)
4 Fuel heat exchanger
5 Fuel pump
5.1 Pressure relief valve (9.0 to 12.0 bar)
6 Fuel filter
6.1 Fuel filter drain valve
6.2 Continuous ventilation in the fuel filter
6.3 Fuel filter element (1.5µ m)
7 Injection nozzles in the nozzle holder combinations
8 Throttle in the banjo union at the
9 Overflow valve (2.0 – 2.6 bar)
9.1 Throttle in overflow valve
10.1 Fuel feed connector (in frame)
10.2 Fuel return flow connector (in frame)
11 Throttle in the pressure side fuel feed to the flame starting system (FLA)
Only in case of vehicles with code (M89) Flame starting system (FLA)
A6 Engine control (MR) control unit
B10 Fuel temperature sensor
R3 Flame glow plug
Only for vehicles with code (M89)
Flame starting system (FLA)
Y5 Flame starting system solenoid valve
Only for vehicles with code (M89)
Flame starting system (FLA)
Y6 Cylinder 1 unit pump
Y7 Cylinder 2 unit pump
Y8 Cylinder 3 unit pump
Y9 Cylinder 4 unit pump
Y10 Cylinder 5 unit pump
Y11 Cylinder 6 unit pump
A Fuel feed line, suction side and / or vacuum side
B Fuel feed line, pressure side
C Fuel high-pressure line
D Fuel return line
E Fuel short circuit line
F Suction or vacuum side fuel feed line to the fuel prefilter with a heated water separator
Only for vehicles with code (K81) Fuel prefilter with heated water separator
G Pressure side fuel feed line to the flame starting system (FLA)
Only for vehicles with code (M89) Flame starting system (FLA)
Pump Line Nozzle – PLD
- Suction Stroke
Selama suction stroke pump element (10) bergerak turun. Solenoid valve (7) de-energized sebagai akibatnya bahan bakar dengan tekanan yang konstan pada fuel low-pressure section masuk kedalam high pressure chamber unit pump (9) melalui saluran supply (8).Note :Energized : mendapat arus listrikDe – energized : tidak mendapat arus listrik
Selama pre stroke pump element (10) bergerak keatas karena solenoid valve (7) energized tetapi valve (6) belum tertutup penuh, sedikit bahan bakar tertekan ke dalam displacement chamber (2) kemudian kembali ke saluran balik (3).
Sesaat setelah valve (6) tertutup, sementara pump element (10) bergerak ke top dead center maka unit pump berada pada posisi delivery stroke. Penyemprotan bahan bakar terjadi pada saat ini. Dalam hal ini tekanan bahan bakar di dalam high pressure chamber (9) meningkat sampai 1800 bar.
- Residual Stroke
Solenoid valve (7) de – energized kemudian valve (6) terbuka (akhir delivery stroke) maka bahan bakar di dalam high pressure chamber (9) berkurang. Sisa bahan bakar yang tertekan oleh pump element (10) sampai pada cam lobe unit pump (1) sehingga masuk ke dalam displacement chamber (2) dan kemudian keluar melalui saluran balik (3). Displacement chamber sebagai expansion chamber untuk pressure peaks (tekanan puncak) dari unit pump saat residual stroke.
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