TM 9-2910-226-34 (1) All new fuel injection pump assemblies from stock, as well as service and repaired pumps must be calibrated on a test stand, using calibration limits tables 3-4 through 3-7, before installation on an engine. (2) The fuel injection pump must be completely assembled for this test. Fuel density compensator assemblies may be new, functionally checked in accordance with paragraph 3-24. (3) Push the test stand 24-volt button (P). The power ON light (Z) should glow. Turn the auxiliary motor switch (AA) to the ON position. (4) Turn on the lube heat switch (T) to bring oil to 150° on the lube oil temperature gage (C). (5) Adjust the lube oil regulator (JJ) to obtain an oil pressure of 35-45 psi on lube oil pressure gage (D). Assure adequate drainage to prevent flooding pump internally. Table 3-9. Temperature of Specific Gravity Conversion Temperature Specific in degrees F. gravity 60 0.810-0.830 65 0.808-0.828 70 0.806-0.826 75 0.804-0.824 80 0.802-0.822 85 0.800-0.820 90 0.798-0.818 95 0.797-0.816 100 0.795-0.815 105 0.793-0.813 110 0.791-0.811 115 0.789-0.809 120 0.787-0.807 125 0.785-0.805 130 0.783-0.803 NOTE Hydrometer, 6630.350-9431 is available. (6) Turn on the fuel heat switch (R) to bring fuel temperature within range listed on calibration tables. Check temperature on gage (B). (7) Open suction valve of fuel supply hose (A, fig. 3-163); and adjust fuel regulator (HH) to obtain 3-5 psi on gage (GG) at supply pump inlet. (8) Set 500-1000-OFF count switch (V) at 1000, the FORWARD-OFF-REVERSE switch (CC) at the REVERSE position, and the test stand speed shifting crank (S) at “High Range” position. Slowly increase fuel pressure by turning regulator (HH) until the overflow valve opens. This can be observed since the fuel pressure gage (A) will show a sudden drop in pressure. Record the pressure. The valve should open at 33-38 psi. If not, replace the overflow valve and repeat the test. Reset fuel pressure to 5 psi. (9) Push in drive motor start button (EE) and adjust speed to 600 rpm. Maintain this speed for five minutes to allow for warm-up. (10) Turn lube oil regulator (JJ) to bring oil temperature to 150 degrees F. on the lube oil tem- perature gage (C). Turn fuel heat switch (R) to bring fuel temperature to 150° F. as indicated on the fuel temperature gage (B). Fuel pressure to hydraulic head (compensator inlet) should be within. limits shown in table 3-10 during testing of pumps. NOTE Run test stand long enough for the fuel to heat to 140° F. Adjust heater control as necessary to obtain this temperature. (11) Remove operating lever dust cover. Remove socket head pipe plug from rear of governor housing on code A, B, E, and F pumps (fig. 3-163). (On code G pumps remove governor cover.) Back out droop screw (fig. 3-172) sufficiently to insure clearance between droop screw and stop plate, with operating lever in full-throttle position. The droop screw must not be in contact with the stop plate when setting full throttle fuel flow. Install governor cover on code G pumps. Figure 3-172. Adjusting droop screw and stop plate guide screw for desired fuel delivery (code G pumps). NOTE Sub paragraph (11) above does not apply to code C and D pumps as a droop screw is not used on these pumps. (12) Check fuel return pressure on gage at pump overflow valve outlet. Pressure should not be greater than 5 psi. If pressure exceeds 5 psi, replace pump overflow valve. c. Calibration of Code C, D, E, and G Pumps. Calibrate code C, D, and G pumps using Table 3-5 as reference. Calibrate code E pumps using Table 3-4 as reference. (1) Use two-hole injector nozzle and holder assemblies. (2) Adjust speed to 2850 rpm with operating lever in full-fuel position and check fuel pressure on gage (A, fig. 3-162) at compensator inlet. Fuel pressure on fuel pressure gage (A) should be 60-80 psi. If fuel pressure is below 60 psi, inspect fuel supply pump (para 3-20) and the test stand fuel 3-105