6-11. FUEL PUMP TEST AND CAUBRATION

TM-9-6115-604-34 Generator Set Diesel Engine Driven Tactical Skid Mtd 5 Kw. 1 Phase-2 Wire 1 Phase -3 Wire 3 Phase -4 Wire 120. 120/240 and 120/208 Volts Manual
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TM 9-6115-604-34 NAVFAC P-8-633-34 NOTE To avoid a false backdash reading in the following check, be sure the fuel pump end of the cover (11) faces up. Turn the drive shaft (31 ) gently to avoid angular movement of the unsupported drive shaft end. (o) Install the lower weight carrier assembly (4) in the cover (11), and check the backlash of the fuel pump drive gear (28) and governor gear (9) as in step (1) (b), above. Back lash must be between 0.005 to 0.009 inch (0.13 to 0.23 mm). (p) Using masking tape such as A-A-883A, secure the spider (19) to the fuel pump drive coupling (23) for use at installation on the engine. NOTE The following adjustment is only an approximation used as a starting point in the calibration procedure. The exact plunger protrusion will be set during the calibration procedures. (q) Install the weight assist spring (3), shims (2), shoulder pin (1), and check the pin protrusion with gage ST- 1241. Add or remove shims (2) to achieve a pin protrusion of 0.890 inch (22.61 mm). (r) Reassemble the fuel pump in accordance with paragraph 6-9. 6-11. FUEL PUMP TEST AND CAUBRATION. a. General. The test and calibration procedure sets the fuel pump to the correct delivery standards. Test specifications are summarized in 6-3. After calibration, it may be necessary to carry out minor adjustments on the engine in accordance with paragraph 6-9. Test stand 3375698 is used to perform testing and calibration procedures (figures Figure 6-15, Figure 6-16, and Figure 6-17). The test oil referred to in the following steps is 3375365. b. Setup. (1) Oil the tachometer gears (17 and 24, Figure 6-12)with clean lubricating oil MlL-L-9000to provide lubrication during the testing and calibration procedure. (2) Position the fuel pump to the pump drive adapter (2, Figure 6-15) on the fuel pump test stand (5), and adjust the coupling (3) to give 0.062 inch (1.57 mm) clearance between the coupling and coupling spider (19, Figure 6-12). (3) Attach the fuel pump to the pump drive adapter (2, Figure 6-15) using the capscrews (33, Figure 6-5), lockwashers (34), and washers (35). Cross-tighten the capscrews to 40 to 45 pound-feet (54 to 61 newton- meters). (4) Open the shutoff valve (Figure 6-10) by turning the knob (2) clockwise as far as it will go. Do not force. This will lift plate valve (11) off its seat on valve housing (1) and allow for full fuel flow through the shutoff valve during the calibraton process. (5) Prime the gear pump assembly (18, Figure 6-8) by squirting some dean test oil through the suction side of the fuel inlet fitting (4). (6) Connect the fuel supply, outlet and return hoses (5, 1, and 3, Figure 6-16) in accordance with Figure 6-16. (7) Turn on the temperature control switch (17, Figure 6-17). (8) Loosen the hexagonal nuts (54, Figure 6-11) and back out the adjusting screws (55) completely so that they do not interfere with the free movement of the control end (51) on the throttle shaft (45). NOTE The throttle shaft (45, Figure 6-11) located in the fuel pump housing (66) turns counter clockwise to open. The throttle shaft (30) located in the cover (23) turns clockwise to open. (9) Lightly damp a pair of locking pliers on the splined end of the throttle shaft (45) to be used as a lever. Hook one end of a universal spring to the handle of the locking pliers, and hook the other end of the spring to a point on the pump drive adapter (2, Figure 6-15). The handle of the locking pliers should be in a near vertical position over the throttle shaft (45), and the spring tension should be maintaining the throttle shaft (45) in the fully open position (rotated fully counter clockwise). 6-33

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