Shown on code (M5Z) engine version Euro VI |
1 | Water separator |
2 | Fuel prefilter |
3 | Fuel filter |
4 | Fuel system high pressure pump |
5 | Fuel high-pressure lines from fuel high-pressure pump to rail |
6 | Rail |
7 | Fuel high-pressure lines from the rail to the respective fuel injector |
8 | Pressure limiting valve |
9 | Fuel return lines of fuel injectors |
10 | Fuel return line from pressure limiting valve |
B602 | Fuel temperature sensor |
B622 | Rail pressure sensor |
B625 | Fuel pressure sensor (outlet) (only for code (M5Z) engine version Euro VI) |
B626 | Fuel pressure sensor (inlet) (only for code (M5Z) engine version Euro VI) |
B638 | Fuel filter module pressure sensor |
Y608 | Cylinder 1 fuel injector |
Y609 | Cylinder 2 fuel injector |
Y610 | Cylinder 3 fuel injector |
Y611 | Cylinder 4 fuel injector |
Y612 | Cylinder 5 fuel injector |
Y613 | Cylinder 6 fuel injector |
Y628 | Fuel metering valve (only for code (M5Z) engine version Euro VI) |
Y629 | Fuel shutoff valve (only for code (M5Z) engine version Euro VI) |
Y642 | Quantity control valve |
A | Fuel feed lines, intake side |
B | Fuel feed lines, thrust side |
C | Fuel high-pressure lines |
D | Fuel return lines |
W07.16-1152-76
General
The emission regulations, which are becoming increasingly strict, and increasing customer demand with regard to fuel consumption, overall profitability, and also environmental protection, require a completely new injection system.
The "Amplified Pressure Common Rail System (APCRS)", is the first common rail system to be used in a Mercedes-Benz commercial vehicle that minimizes the quantity of fuel required for combustion.
On the one hand, this is taken care of by a fuel low-pressure circuit, which ensures that the fuel is cleaned and available to the fuel high-pressure circuit of the APCRS in sufficient quantities, and on the other hand the fuel high-pressure circuit, via which the fuel supplied by the fuel low-pressure circuit is injected into the cylinder at the right time, with the required pressure and in sufficient quantities.
Fuel low-pressure circuit
The fuel low-pressure circuit essentially consists of the following components:
Fuel tank
Fuel filter module with water separator (1), fuel prefilter (2) and fuel filter (3), in which the fuel is cleaned in several stages
Fuel pump which is located at the fuel system high pressure pump (4)
Fuel feed lines, intake side (A)
Fuel feed lines, thrust side (B)
Fuel return lines (D), via which the diverted quantity of the solenoid valves at the nozzle needles and the diverted quantity of the solenoid valves at the pressure boosters is returned to the fuel low-pressure circuit
Fuel temperature sensor (B602)
Fuel filter module pressure sensor (B638)
For code (M5Z) engine version Euro VI, the following component parts are also added:
Fuel pressure sensor (outlet) (B625)
Fuel pressure sensor (inlet) (B626)
Fuel metering valve (Y628)
Fuel shutoff valve (Y629)
Fuel high-pressure circuit
The fuel high-pressure circuit of the APCRS consists of the following components:
Fuel system high pressure pump (4), which delivers the fuel into the rail (6) and compresses it to about 900 bar
Rail (6)
Pressure limiting valve (8), which is closed during normal operation and only opens if the maximum rail pressure of 1100 bar is exceeded (limp home mode)
Rail pressure sensor (B622)
Cylinder 1 fuel injector (Y608)
Cylinder 2 fuel injector (Y609)
Cylinder 3 fuel injector (Y610)
Cylinder 4 fuel injector (Y611)
Cylinder 5 fuel injector (Y612)
Cylinder 6 fuel injector (Y613)
Quantity control valve (Y642)
Fuel high-pressure lines (C)