6.2 Fuel system Care and maintenance work z Position fuel collecting receptacle beneath fuel prefilter. z Empty water and dirt from the bowl 6 by ope- ning the drain cock (press in lightly without using force and turn) and close the drain cock again afterwards. z Close the vent screw 1 on the cover 2. z Vent the fuel system see ( 32 ) . Changing the filter element 5: Change at least once a year or when necessa- ry (drop in performance even after purging). z Shut off the engine or switch over to the other filter if a lubricating oil filter is fitted. z Close the fuel stopcock or supply (if availab- le). z Loosen the cover screws 3 diagonally. z Remove cover 2. z Remove spring cassette 4.
z Remove filter insert 5 on the clip. z Insert new filter insert 5. z Place the spring cassette 4 on the element. z Check the cover gasket for correct fit in the cover 2 and for damage (change if necessa- ry). z Tighten the cover 2 with the screws 3 diago- nally (tightening torque 6 Nm). z Check the cover 2 for correct fit and tight- ness. z Vent the fuel system see ( 32 ) . Cleaning / purging and possibly changing the fuel prefilter 6 Connection of a warning system (lamp/ siren) to contacts 7 is prescribed. Im- mediate maintenance is necessary if the warning system is triggered. No naked lights when working on the fuel system! Do not smoke!
Dispose of used fuel in an environmen- tally friendly way! Cleaning (purging) – draining water: z Shut off the engine or switch over to the other filter if a lubricating oil filter is fitted. z Close the fuel stopcock or supply (if availab- le). z Open the vent screw 1 on the cover 2. 33