TM 5-3805-262-34
2-5. FUEL SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. FUEL INJECTION PUMP NOT OPERATING PROPERLY (Cont).
Step 7.
Watch test line for number 5 cylinder and rotate test bench drive by
hand until a steady flow of fuel from number 5 test line is obtain-
ed.
Watching fuel flow from number 5 cylinder test line, rotate test
bench drive by hand until fuel flow just stops.
Camshaft angle as indicated by test bench degree wheel pointer
should be 60 ±1/2 degree.
NOTE
After checking camshaft angles and adjusting roller tappets as neces-
sary, rotate test bench degree wheel until its zero degree mark is alin-
ed with test bench pointer (cylinder number 1 port closure). Then scribe
a line on fuel injection pump drive hub and end plate to coincide with
cylinder number 1 port closure.
a. If camshaft angle is 60 ±1/2 degrees for number 5 cylinder, re-
peat this step to check camshaft angle for cylinder numbers 3,
6, 2, and 4. Camshaft angle for cylinder number 3 should be 120
±1/2 degrees; for number 6, 180 ±1/2 degrees; for number 2, 240
±1/2 degrees;
and for number 4, 300 ±1/2 degrees. If all cam-
shaft angles are okay, go to step 8 below.
b. If camshaft angle is not as specified above, using two open end
wrenches, loosen roller tappet adjusting capscrew nut associated
with cylinder requiring adjustment. If timing is late, turn ad-
justing capscrew counterclockwise; clockwise if timing is early.
Tighten nut and recheck adjustment by repeating this step.
NOTE
Following steps check and adjust balancing (fuel delivery) of fuel in-
jection pump.
Step 8.
Remove fuel gallery plug from port at drive end of fuel injection
pump.
Install bleeder valve in port at drive end of fuel injection pump.
Close test bench bleed screws to deliver fuel to test bench gradu-
ates.
2-55
