Cleaning and Inspection. - TM-10-3930-242-340079

TM 10-3930-242-34

Figure 3-33. Cam follower and guide location

tain 50-to 70-psi on the output side at 1800 rpm,

ing solvent such as P-D-080, or equal. Dry

engine speed. Lift on the suction should not ex-

thoroughly.

ceed 48 inches. To check the fuel flow:

( 2 ) Inspect all parts for excessive wear and

s c o r i n g . Inspect mating surfaces of the pump

( 1 ) Disconnect fuel return line at fuel tank,

or source of supply, and hold open end of pipe in

b o d y and cover. They must be smooth and flat.

a suitable container,

Remove all nicks and burs with a fine file.

( 2 ) Start and run engine at 1200 rpm and

( 3 ) Discard and replace all gaskets. Repair

m e a s u r e fuel flow return for one minute. Ap-

o r replace all parts as necessary.

e. Reassembly. Refer to figure 3-36 and reas-

proximately one-half gallon of fuel should be

returned.

semble fuel pump, as follows:

( 3 ) If fuel flow is insufficient for satisfac-

( 1 ) Install fuel pump driven gear (10, fig.

t o r y engine performance, clean or replace fuel

3 - 3 6 ) , if removed, over end of drive shaft (11)

strainer.

w h i c h is not squared (with the slot in the gear

facing the plain end of the shaft) to prevent

( 4 ) If fuel flow is still insufficient, replace

s e c o n d a r y fuel filter and recheck fuel flow. If

scoring the gear. Press gear beyond locking ball

retaining hold. Place ball in hole and press gear

f u e l flow is unsatisfactory, replace fuel pump.

back until end of slot contacts ball.

( 5 ) Clean all lines and insure all fuel line

( 2 ) Place gear (10) and shaft (11) in pump

c o n n e c t i o n s are tight,

body (5) with chamfered end of gear teeth facing

b. R e m o v a l .

p u m p body.

(TM

fuel

pump

the

( 1 ) Remove

(3) Apply thin coat of sealer to face of cover

10-3930-242-12).

a n d assemble pump. Use the remaining compo-

(2) Cap fuel lines.

nents, as shown in figure 3-36.

c. Disassembly. Refer to figure 3-36 and dis-

(4) Rotate pump by hand to insure that

a s s e m b l e fuel pump.

p a r t s operate freely. If binding exists, disas-

d. Cleaning and Inspection.

s e m b l e and determine cause.

Installation.

(1) Clean all parts, thoroughly, using clean-

3-39