TM 5-3805-261-23-1
ENGINE TROUBLESHOOTING PROCEDURES - CONTINUED
0006 00
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
Engine Knocks.
WARNING
When opening fuel system, do not look directly at fitting. Fuel is under high
pressure. Wear eye protection. Failure to follow this warning may cause injury
to personnel.
Check the fuel injection nozzles. Run
If loosening a fuel line nut does not make
the engine at an RPM that causes the
a difference, replace injection nozzle (WP
most noise. Loosen a fuel line nut on
0278 00).
the injection of each cylinder one at
a time, then tighten.
1.
Check for air in fuel system.
Bleed injection lines (WP 0035 00). If the
8.
Engine Misfires, Runs
Rough, or Stalls.
problem still exists, go to Test 2.
2.
Check fuel pressure with fuel
pressure gauge.
a. Remove fuel pressure switch from
fuel injection pump (WP 0115 00).
b. Install fuel pressure gauge.
c. Start engine and run at high idle.
Pressure should be read at least 15
psi (103 kPa) (TM 5-3805-261-10).
d. If pressure is low, proceed with
Tests 3 and 4.
3.
Look for damaged fuel lines.
Replace defective fuel lines and bleed fuel
lines (WP 0035 00, WP 0041 00, and WP
Test 4.
4.
Check for clogged primary fuel filter.
a. Disconnect fuel line between fuel
filter and fuel injection pump
housing at fuel injection pump
housing.
b. Place start switch in the ON
If fuel does not shoot out from
position and crank engine (TM 5-
disconnected line, replace primary fuel
3805-261-10).
filter (WP 0045 00 and WP 0046 00). If
the problem still exists, go to Test 5.
5.
Check fuel system timing (WP 0278
Adjust fuel system timing (WP 0278 00).
00).
If the problem still exists, go to Test 6.
