Table 3-9. Temperature of Specific Gravity Conversion

TM 9-2910-226-34

fuel temperature to 150 F. as indicated on the fuel

(1) All new fuel injection pump assemblies

temperature gage (B). Fuel pressure to hydraulic

from stock, as well as service and repaired pumps

head (compensator inlet) should be within. limits

must be calibrated on a test stand, using calibration

shown in table 3-10 during testing of pumps.

limits tables 3-4 through 3-7, before installation on

an engine.

NOTE

(2) The fuel injection pump must be completely

Run test stand long enough for the fuel to

assembled for this test. Fuel density compensator

heat to 140 F. Adjust heater control as

assemblies may be new, functionally checked in

necessary to obtain this temperature.

accordance with paragraph 3-24.

(11) Remove operating lever dust cover.

(3) Push the test stand 24-volt button (P). The

Remove socket head pipe plug from rear of governor

power ON light (Z) should glow. Turn the auxiliary

housing on code A, B, E, and F pumps (fig. 3-163).

motor switch (AA) to the ON position.

(On code G pumps remove governor cover.) Back out

(4) Turn on the lube heat switch (T) to bring oil

droop screw (fig. 3-172) sufficiently to insure

to 150 on the lube oil temperature gage (C).

clearance between droop screw and stop plate, with

(5) Adjust the lube oil regulator (JJ) to obtain

operating lever in full-throttle position. The droop

an oil pressure of 35-45 psi on lube oil pressure gage

screw must not be in contact with the stop plate

(D). Assure adequate drainage to prevent flooding

when setting full throttle fuel flow. Install governor

pump internally.

cover on code G pumps.

Table 3-9. Temperature of Specific Gravity Conversion

Temperature

Specific

in degrees F.

gravity

0.810-0.830

0.808-0.828

0.806-0.826

0.804-0.824

0.802-0.822

0.800-0.820

0.798-0.818

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.

Figure 3-172. Adjusting droop screw and stop plate guide screw

(6) Turn on the fuel heat switch (R) to bring fuel

for desired fuel delivery (code G pumps).

temperature within range listed on calibration

tables. Check temperature on gage (B).

NOTE

(7) Open suction valve of fuel supply hose (A,

Sub paragraph (11) above does not apply to

fig. 3-163); and adjust fuel regulator (HH) to obtain

code C and D pumps as a droop screw is not

3-5 psi on gage (GG) at supply pump inlet.

used on these pumps.

(8) Set 500-1000-OFF count switch (V) at 1000,

(12) Check fuel return pressure on gage at

the FORWARD-OFF-REVERSE switch (CC) at the

pump overflow valve outlet. Pressure should not be

REVERSE position, and the test stand speed

greater than 5 psi. If pressure exceeds 5 psi, replace

shifting crank (S) at "High Range" position. Slowly

pump overflow valve.

increase fuel pressure by turning regulator (HH)

c. Calibration of Code C, D, E, and G Pumps.

until the overflow valve opens. This can be observed

Calibrate code C, D, and G pumps using Table 3-5 as

since the fuel pressure gage (A) will show a sudden

reference. Calibrate code E pumps using Table 3-4 as

drop in pressure. Record the pressure. The valve

reference.

should open at 33-38 psi. If not, replace the overflow

(1) Use two-hole injector nozzle and holder

valve and repeat the test. Reset fuel pressure to 5

assemblies.

psi.

(2) Adjust speed to 2850 rpm with operating

(9) Push in drive motor start button (EE) and

lever in full-fuel position and check fuel pressure on

adjust speed to 600 rpm. Maintain this speed for five

gage (A, fig. 3-162) at compensator inlet. Fuel

minutes to allow for warm-up.

pressure on fuel pressure gage (A) should be 60-80

(10) Turn lube oil regulator (JJ) to bring oil

psi. If fuel pressure is below 60 psi, inspect fuel

temperature to 150 degrees F. on the lube oil tem-

supply pump (para 3-20) and the test stand fuel

perature gage (C). Turn fuel heat switch (R) to bring

3-105