and depot maintenance personnel. Organizational maintenance personnel should not proceed without proper authority.
49. Engine Fails to Start
Probable cause
Possible remedy
a. Lack of fuel.
Fill tank and prime carburetor.
b. Overchoking.
Let engine stand for a few minutes then
repeat starting procedure without
choking.
c. Dirt in fuel lines.
Disconnect and clean fuel lines (par. 71).
d. Fouled spark plug.
Remove, clean, adjust, and replace.
e. Water in fuel.
Drain and refill fuel tank (par. 72);
clean fuel pump bowl (par. 74).
f. Loose wiring.
Tighten connections.
g. Defective distributor.
Clean and adjust points (par. 95).
Check condenser and coil. Replace
if necessary (pars. 200 through 204).
See note in paragraph 48.
h. Weak batteries.
Test specific gravity (par. 90). Re-
charge if necessary.
i. Loose governor levers.
Tight or replace as necessary (par. 110).
j. Leaking intake manifold
Replace (par. 120).
gasket.
k. Leaking valves.
Grind valves and seats (par. 122).
l. Improper ignition timing.
Check timing with timing check light
m. Improper valve timing.
Check valve adjustment (par. 121).
50. Engine Misfires
Probable cause
Possible remedy
a. Fouled spark plug.
Remove, clean, adjust and replace (par. 96).
b. Loose wiring.
Tighten connections.
c. Defective distributor.
Clean and adjust points (par. 96).
Check condenser and coil. Replace if
necessary (pars. 200 through 204).
See note in paragraph 48.
d. Leaking cylinder head gasket.
Tighten head nuts (par. 122). Replace
gasket if necessary (par. 122).
e. Leaking intake manifold
gaskets.
Replace gaskets (pars. 120 and 123).
f. Dirt in fuel lines.
Disconnect and clean (par. 71).
g. Water in fuel.
Drain and refill tank (par. 72). Clean
fuel pump bowl (par. 74).
h. Improper fuel mixture.
Adjust carburetor (par. 77).
i. Broken or warped valves.
Replace (par. 122).
j. Sticking valves.
Clean and inspect. Replace if neces-
sary (par. 122).
k. Improper valve clearance.
Adjust (par. 121).
I. Improper ignition timing.
Check timing with timing check light
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