TM-9-2910-226-34

PUMP, FUEL, METERING AND DISTRIBUTING, ASSEMBLY

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT, MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

JUNE 1974

TM-9-2910-226-34 - Page 144 of 208

TM 9-2910-226-34

manually work the valve in the bore. Valve must be

free with no sticking or binding. If valve does not

operate freely, replace the hydraulic head assembly.

g. Install valve (C), delivery valve spring (B), and

screw (A), and torque tighten valve screw to 40-45

foot-pounds. Loosen screw and retorque to 40-45

foot-pounds two more times.

3-54. Delivery Valve Test.

a.

Rotate the drive

coupling in a counterclockwise direction until the

slotted, red painted tooth is one-half tooth to the

right of the mark on the pump housing.

b.

Slowly actuate the nozzle tester and note the

reading on the nozzle tester gages as the delivery

valve opens. This will be evidenced by a sudden drop

in pressure. The delivery valve should open between

250 and 400 psig.

NOTE

Do not exceed 425 psig as damage to

preformed packings may result.

c.

If the reading is not within specification,

remove the delivery valve and inspect the spring,

valve, and seat for foreign matter or damaged parts

(fig. 3-166). If spring is defective, replace spring. If

valve or seat is defective, replace the hydraulic head

assembly.

3-55. Hydraulic Head Leak Test.

a.

Remove timing

device cover, timing window cover or fuel shutoff

housing. Rotate the drive coupling in a clockwise

direction until the mark on the advance unit hub is

alined with the pointer (port closing) (fig. 3-168).

Table 3-4. Calibration of LDT-465-1C (Code E Pump)

3-98