Figure 166. Location of the fuel filter
Figure 167. Removing and installing the fuel filter: 1 — filter cartridge; 2 — filter housing; 3 - fastening of fuel hoses; 4 - bolts; 5 - fastening; 6, 7 - fuel hoses; 8 — fuel supply circuit hose
Figure 168. Fuel filter and connecting lines on a 2.9 L engine: 1 - sealing ring; 2 - hollow bolt; 3 — nipple for fastening fuel hoses to the filter; 4 — bolt; 5 - connecting nipple; 6 - connecting hose of injectors; 7 - sealing ring; 8 — connection nipple for the return fuel line; 9 - rubber hose of the return fuel line; 10 — return fuel line; 11 — clamp for fastening the fuel line to the thermostat housing; 12 — fuel supply hose; 13 — clamp for fastening the fuel line to the thermostat housing; 14 — clamp for fastening the fuel line to the thermostat housing; 15 — clamp for fastening the hose to the heat exchanger; 16 — clamp; 17 — adapter; 18 — clamp for fastening the adapter to the cylinder head; 19 — fuel line; 20 — hose; 21 — fuel hose from filter to high-pressure fuel pump; 22 — sealing ring; 23 — filter housing; 24 - fuel filter with gaskets; 25 - sealing ring; 26 — threaded connection to the high-pressure fuel pump; 27, 28 — return fuel lines; 29 — sealing ring; 30 — heat exchanger mounting bolt; 31 - sealing ring; 32 — fuel line; 33 - heat exchanger for heating fuel; 34 — fuel line
Fuel injection pumps and injectors are very sensitive to contamination of diesel fuel. A fuel filter serves to clean it. Every 60,000 km its filter element must be replaced. Figure 166 shows the position of the fuel filter in the engine compartment. When replacing it, you need to follow the drawing 167. Figure 168 shows the parts of the fuel filter on a 2.9 L engine and its installation. The fuel filter element must be replaced as follows:
- remove the air filter housing (on a turbocharged diesel engine);
- unscrew cartridge 1 from below (see figure 167) filter. In this case, you should place a container under the leaking fuel. If only the filter element is being replaced, screw in a new cartridge;
- to remove the filter housing, unscrew bolts 4 and remove fasteners 3 and 5;
- disconnect fuel hoses 6 and 7 from filter housing 2. Also unscrew fuel supply hose 8;
- unscrew the bolts securing the filter housing to the cylinder head and remove it.
(Material based on data from the portal: «MercedesMan»)
Installation is carried out in reverse order. Tighten the housing to the cylinder head with a torque of 23 Nm, and fasten the fuel hoses to the filter with a torque of 9 Nm.