MWM MS 3.9L, Operation And Maintenance Manual, Page: 34 / 53

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NP 085.70.69 - 01/06
4. Clean the lower base internally with diesel fuel.
5. Assemble the system with a new gasket, a new filter element and the
lower base. Tighten the central bolt with a torque of 12 Nm (1,2 kgf.m)
(8.3 lb.ft).
6. Bleed the filter's outlet pipe for the injection pump.
7. Run the engine and check it for leakage.
Note: Replace the filter elements according to the
recommended periods and use only genuine filter
elements.
Supply pump
The supply pump actuates for transferring the fuel from the tank for the
injection pump, passing it through the filters.
Filter screen cleaning
1. Clean the supply pump externally using a brush and a solvent.
2. Clean the plug, sealing gasket and filter screen.
3. Wash the filter screen with kerosene or alcohol, and dry it with
compressed air.
4. Remove any debris from internal side of supply pump.