Table 11-3. Organizational Preventive Maintenance Checks and Services.
Item
Interval (hours)
No.
50
100
500
Item to be inspected
Procedure
01
X
Spark plug
Clean and regap
02
X
Spark plug
Replace
03
X
Cylinder fins
Clean cylinder fins
04
X
Cylinder exhaust port
Clean
05
X
Exhaust manifold
Clean
06
X
Muffler
Clean
07
X
Fuel lines
Repair if damaged
08
X
Magneto breaker points
Clean and regap
09
X
Cylinder chamber and piston dome
Remove and clean
10
X
Condenser and breaker points
Change points and set gap
Table 11-4. Organizational Troubleshooting Chart - Liquid Loading System.
Malfunction
Probable cause
Corrective action
a. Ignition switch not set correctly.
a. Set ignition to ON.
1. Engine fails to start or starts with dif-
b. No fuel in tank.
b. Fill fuel tank.
ficulty.
c. Excessive carbon on spark plug.
c. Clean or replace spark plug (11-8b).
d. Regap spark plug (11-8b).
d. Spark plug gap incorrect.
e. Muffler clogged.
e. Clean muffler (11-8c).
f. Exhaust manifold or cylinder exhaust
f. Clean exhaust manifold and cylinder
port clogged.
exhaust port (11-8d).
g. Air cleaner element clogged.
g. Clean or replace air cleaner element
(11-5b (2)).
h. Water or dirt in fuel tank.
h. Drain, clean, and refill fuel tank with
correct fuel mixture.
i. Engine needs choking.
i. Pull choke button out and restart.
j. Fuel tank cap valve clogged.
j. Remove cap and restart; if engine runs
better, replace fuel tank cap.
a. Incorrect fuel mixture.
a. Drain, clean, and refill tank with cor-
2. Engine overheats or lacks power.
rect fuel mixture.
b. Choke open.
b. Push in choke button fully to close
choke.
c. Carburetor improperly adjusted.
c. Adjust carburetor.
d. Muffler, exhaust manifold, or cylinder
exhaust port clogged.
fold, and cylinder exhaust port (11-
8d).
e. Clean cylinder fins.
e. Cylinder fins clogged.
f. Inadequate ventilation.
f. Provide adequate cooling air flow.
g. Engine or pump parts binding.
g. Perform overhaul (report this condition
to direct support maintenance).
h. Air leak in fuel line.
h. Inspect and replace fuel line if
required.
i. Ruptured fuel pump diaphragm.
i. Disassemble carburetor and correct
trouble.
j. Spark plug fouled.
j. Clean and regap or replace spark plug
(11-8b).
a. Choke open.
a. Push in choke button fully to close
3. Engine misfires.
choke.
b. Carburetor improperly adjusted.
b. Adust carburetor (11-8f).
c. Spark plug fouled.
c. Clean and regap or replace spark plug
(11-8b).
d. Ignition cable, ignition coil, or breaker
d. Replace defective parts.
points defective.
a. Excessive oil in fuel mixture.
a. Drain fuel tank and fill with correct
4. Excessive smoke from muff ler.
fuel mixture.
b. Carburetor set too rich.
b. Adjust carburetor (11-8f).
11-9
