Precalibration Adjustments

TM 9-2910-226-34

governor housing. Add or remove spacers until the

Remove

3-56. Precalibration Adjustments. a.

correct dimension in figure 3-144 is attained.

nozzle tester hose and fittings from hydraulic head

m. Remove the outer spring and spacer from the

inlet elbow. Remove nozzle tester from test stand.

gage and install on the governor end cover.

Remove improvised adapter.

n. Install the inner spring and spacer on the gage

b. Remove fuel density compensator. On code G

and install in the governor housing (fig. 3-145). With

pumps only, remove governor cover.

the gage flush with the governor housing, measure

c. Set the smoke limit torque cam angle in ac-

the distance between the inner spring spacer and the

cordance with table 3-8. Smoke limit torque cam

gage. Add or remove spacers until the correct

angle is the angle measured from the cam nose to the

dimension shown in figure 3-145 is attained.

fulcrum lever (fig. 3-73).

o. Remove the inner spring and spacer from the

d. Back out both idle speed screws, flush with the

gage and install on the governor end cover.

bottom of lug.

p. Using a new gasket, install the governor end

e. Remove the governor housing end cover, inner

cover, inner and outer springs and spacers in the

and outer governor springs and spacers. Remove the

gasket and discard unless a new, untorqued gasket

governor housing. Torque bolts to 50-60 lb. in.

was used,

q. Reinstall fuel density compensator using new

gasket. Torque the four inch bolts to 75-100 inch-

f. Position the operating lever in the low-idle

pounds. Reinstall fuel line between fuel density

position. Hold with a spring.

compensator inlet tee and hydraulic head inlet. On

g. Using a depth micrometer, measure and record

code G pumps only, reinstall governor cover.

the distance between the governor housing and the

governor sliding sleeve.

3-57. Preparation for Calibration.

h. Position the operating lever in the full-fuel

NOTE

position. Hold with a spring.

The key letters shown below in parentheses

i. Again using the depth micrometer, measure

refer to figures 3-163, 3-169, and 3-170

and record the distance between the governor

unless otherwise indicated.

housing and the sliding sleeve. A reading of 0.630

a . Remove the inch pipe plug from the

inch is required for full sliding sleeve travel. If

hydraulic head outlet port and install the overflow

specification is not attained, internal interference to

valve. Remove socket head pipe plug from the rear of

the governor components or control sleeve is in-

the governor housing (code A, B, E and F pumps).

dicated.

b. Connect compensator to overflow valve tube

j. Position the operating lever in the low-idle fuel

assembly at the valve. Install tube assembly from

position. Hold with a spring.

compensator inlet tee to the elbow in the hydraulic

k. Install the outer spring spacers and outer

head.

spring on the governor gap gage, 4910-793-5040.

c . Install timing window cover, or solenoid

NOTE

housing assembly (para 3-47). Torque socket head

Do not install the gasket since the gage is

capscrew securing the solenoid housing assembly to

designed to compensate for gasket

110-120 inch-pounds. Install timing device cover,

thickness.

using a new gasket, and secure with retaining bolts

l. Install the outer spring spacers and governor

and lockwashers.

gap gage in the governor housing until the gage just

d. Install test stand-to-pump hoses. Refer to

touches the spring (fig, 3-144). Using feeler gages,

figures 3-163, 3-169 and 3-170.

measure the distance between the gage and the

3-101