6. Fuel injection equipment1456.2.3 Disassembly and reassembly of fuel feed pump(1) Disassembly1) Remove the fuel feed pump mounting nut, and take the fuel feed pump off the fuel injection pump.2) Clean the fuel feed pump assembly with fuel oil.3) After checking the orientation of the arrow on the cover, make match marks on the upper body andcover, remove the small screw, and disassemble the cover, upper body and lower body.(2) Reassembly1) Clean all parts with fuel oil, inspect, and replace any defective parts.2) Replace any packing on parts that have been disassembled.3) Make sure that the intake valve and discharge valve on upper body are mounted in the properdirection , and that you don’t forget the valve packing.4) Assemble the diaphragm into the body, making sure the diaphragm mounting holes are lined up(do not force).5) Align the match marks on the upper body of the pump and cover, and tighten the small screwsevenly.6.2.4 Fuel feed pump inspection(1) Place the fuel feed pump in kerosene, coverthe discharge port with your finger, move thepriming lever and check for air bubbles(Repair or replace any part which emits airbubbles).(2) Attach a vinyl house to the fuel feed pump intake, keep the pump at the specified depthfrom the fuel oil surface, move the priming lever by hand and check for sudden spurts offuel oil from the discharge port. If oil is not spurted out, inspect the diaphragm anddiaphragm spring and repair/replace as necessary.(3) Diaphragm inspectionParts of the diaphragm that are repeatedly burned willbecome thinner or deteriorate over a long period oftime.Check the diaphragm and replace if necessary.N•m(kgf•m)Tightening torque 147-245 (15-25)Measuring cylinderTappetBlockedAir pressure kg/cm 3Container filledwith light oilDiaphragm
