TESTING (cont) - TM-10-3930-638-24-P0907

TM 10-3930-638-24&P

4-3. FUEL SYSTEM MAINTENANCE (cont)

b. Fuel Injection Pump (cont).

REMARKS

ITEM

ACTION

LOCATION

STEP

TESTING (cont)

Dry pump off completely with compressed

Pump

Operate pump

Test stand

at 1000 RPM

air. Check for leaks and correct if

necessary

wide open

throttle for

10 minutes

Back out

Housing

a. Low idle adjusting

screw (41)

Back out

b. High idle adjusting

screw (43)

c. Torque screw

Back out

(52)

d. Vacuum check

a. Close shutoff

valve in fuel

supply line

b. Operate pump Transfer pump must create a vacuum of at

least 18 inches of mercury. If not, check

at 400 RPM

for air leaks between pump inlet and shut-

off valve or deficiencies in transfer pump

components

a. Fill graduates

e. Return oil

check

to bleed

air from

test stand

and to wet

graduates

b. Operate

Direct return oil flow into calibrated gradu-

pump at

ate. Return oil flow shall be 200500CC/

minute

210010

RPM

CAUTION

Under no circumstances exceed 130 PSI when performing the

following.

Operate pump

Transfer pump pressure shall be 67-71 PSI

f. Transfer pump

pressure check

at 210010

RPM

NOTE

Transfer pump pressure gauge must be isolated by the shutoff

valve at injection pump when checking fuel delivery and advance

movement.

4-129