FUEL INJECTION LINES - TM-5-3805-263-14P-2

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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TM 5-3805-263-14&P-2 FUEL SYSTEM TESTING AND ADJUSTING FUEL INJECTION LINES Fuel from the fuel injection pumps goes to the fuel injection nozzles through the fuel injection lines. When fuel injection lines are disconnected or re- moved, always put caps or plugs on the ends to keep dirt out of the lines. When fuel injection lines are installed, be sure all clamps and dampers are in- stalled in their original location. The nuts that hold a fuel injection line to an injec- tion nozzle and injection pump must be tightened to the correct torque. If the nut is loose, fuel will leak from the connection. If the nut is tightened too tight, the inside diameter of the line will become smaller and cause a restriction to the flow of fuel in the line. Use a torque wrench and a 5P144 Fuel Line Socket to tighten the fuel injection line nuts to 40 ± 7 N•m (30 ± 5 lb. ft.). Fuel injection lines which are bent, damaged or rubbing can leak and cause a fire. Replace my lines which have damage or leaks that can not be corrected when tightened to the correct torque. CHECKING THE PLUNGER AND LIFTER OF AN INJECTION PUMP NOTE: There are no different size spacers available to adjust the timing dimension of the fuel injection pumps. If the pump plunger or the lifter is worn, they must be replaced. Because there is no adjustment to the timing dimension possible, there is NO OFF’ ENGINE LIFTER SETTING PROCEDURE. 1-42 TESTING AND ADJUSTING When there is too much wear on the fuel injection pump plunger, the lifter may also be worn and there will not be good contact between the two parts. To stop fast wear on the end of a new plunger, install new lifters in the place of the lifters that have wear. WEAR BETWEEN LIFTER AND PLUNGER Fig. A. Illustrates the contact surfaces of a now pump plunger and a new lifter. In Fig. B the pump plunger and lifter have worn considerably. Fig. C shows how the flat end of a now plunger makes poor contact with a worn lifter, resulting in rapid wear to both parts. An injection pump can have a good fuel flow com- ing from it but not be a good pump because of slow timing that is caused by wear on the bottom end of the plunger. When making a test on a pump that has been used for a long time, use a micrometer and measure the length of the plunger. If the length of the plunger is shorter than the minimum length (worn) dimension given in the chart, install a new pump. FUEL PUMP PLUNGER Length (new) 73.886 ± 0.013 mm (2.9089 ± .0005 in.) Minimum length (worn) ......... 73.873 mm (2.9084 in.) Look for wear at the top part of the plunger. Check the operation of the plunger according to the instruc- tions for the Fuel Injection Test Bench. REMOVAL AND INSTALLATION OF FUEL INJECTION PUMPS Tools Needed: 8S4613 Wrench. 8S2244 Extractor. 7N1048 Timing Pin. Removal of Fuel Injection Pumps CAUTION Before my parts are removed from the fuel injection pump housing, thoroughly than all dirt from the housing. Dirt that gets inside the pump housing will cause much damage. NOTE: The fuel rack must be in the center position before the fuel injection pumps can be removed.

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