Calibration of Fuel Injection Pump

TM 9-2910-226-34

(6) Connect the test stand overflow valve-to-

prevent leakage. (Refer to tables 3-4 through 3-7 for

test stand fuel return hose (D) to the injection pump

proper nozzles to be used. )

overflow valve. Plug unused opening in tee of

Install six fuel delivery tube assemblies

overflow valve to prevent loss of test fluid.

supplied with the test stand, to the hydraulic head in

e. Install nozzle and adapter holders in the ac-

correct numbered sequence. (Hydraulic head outlet

cumulator chambers, three on each side of center

ports are numbered.) Connect the other end to the

drive hub (refer to fire 3-164).

injector nozzle assemblies in correct number

sequence (fig. 3.171).

f. Install previously calibrated nozzle and holder

assemblies in the accumulator chambers. Tighten to

Figure 3-171. Metering and distributing pump discharge sequence.

3-58. Calibration of Fuel Injection Pump. a.

Heavy and light fuels may be blended to obtain

G e n e r a l . The following conditions must be

proper specific gravity. (See table 3-9 for specific

maintained during pump calibration:

gravity temperature conversion. )

(1) Fuel pressure in fuel pressure gage (GG,

(5) Final high- and low-idle adjustment to b

fig. 3-162) must be 3-5 psi, all speeds.

made on operating engine. (Except on code A pump,

(2) Fuel return pressure after overflow valve, 5

adjust low-idle only. )

psi maximum.

b. Pre-calibration Procedures.

(3) Lubricating oil on the lube oil pressure gage

NOTE

(D, fig. 3-162), 35 psi minimum.

The key letters shown below in parentheses

(4) Do not calibrate pump with diesel fuel

refer to figure 3-162 unless otherwise in-

heavier than 0.83 specific gravity at 60 degrees F.

dicated.

3-104