6 Fuel system Servicing and maintenance works in idling mode or at low load. Check the pre-filter for leaks while doing this. © 2009 47 z Empty any fuel remaining in the fuel collection vessel and clean the water collection vessel. z Screw the water collection vessel clockwise onto the new filter cartridge. z Clean any dirt off the sealing surfaces of the new filter cartridge and opposite side of filter head. z Wet the sealing surfaces of the filter cartridge slightly with fuel and screw back on to the filter head, clockwise (17-18 Nm). z Open the fuel shutoff tap and vent the system, see venting the fuel system.
z Unlock the bayonet connection of the fuel supply pump by pressing upwards and simultaneously turning anticlockwise. The pump pistons are now pressed out through the spring. z Keep pumping until a very strong resistance can be felt and the pumping only progresses very slowly. z Now continue pumping several times. (The re- turn line must be filled). z Lock the bayonet connection of the fuel supply pump by pressing upwards and simultaneously turning clockwise. z Start the engine and operate approx. 5 minutes z Open the drain cock and drain liquid. z Unscrew the filter cartridge together with the wa- ter collection vessel in anticlockwise direction and remove.
z Loosen the water collection vessel from the old filter cartridge by turning anti-clockwise and re- move. The special tool can be ordered under part number 8192 ( 76 ). Vent the fuel system 1 Fuel supply flow to the pump 2 Fuel return flow from the control block FCU (Fuel Control Unit) 3 Fuel pump 4 Thermostat valve with stop lever (optional) 5 Filter insert 6 Electrical connection for water level sensor 7 Water drain tap 8 Water collection vessel 9 Fuel inlet from the fuel tank 10 Fuel return to fuel tank 11 Connection for electrical warning lamp/horn z Shut off the fuel supply to the engine (with high- level tank). z Place suitable collecting containers underneath.
Clean/change/vent the fuel pre-filter Change the fuel pre-filter insert D eutz C ommon R ail ( DCR ) 11