Cessna 150K - Page 142

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11-9. TROUBLE SHOOTING.
TROUBLE
PROEABLE CAUSE
REMEDY
ENGINE WILL
NOT START.
Fuel tank empty.
Fill with proper grade of gasoline .
.
Improper use of starting Review starting procedure.
procedures.
Fuel shut-off valve in OFF Turn shut-off valve ON.
position.
Carburetor screen or fuel strainer Remove and clean thoroughly.
plugged.
Remove moi sture.
Engine flooded. Refer to paragraph 11-67.
Defective ignition system. Refer to paragraph 11-47.
Excessive induction air leaks. Correct the cause of leaks.
Insufficient priming (puffs of
Prime more. In cold weather
white smoke and weak com- draw plunger slowly back,
bustion).
push hard. Check pump output
at priming jet.
Defective magneto switch or
Check continuity.
Repair or
grounded magneto "P" leads.
replace switch or wiring.
Defective carburetor. Repair or replace carburetor.
Spark plugs fouled or improperly Remove and clean: check gaps
gapped.
and insulators. Use new gaskets.
Check cables to perSistently
foulded plugs. Replace defective
plugs.
Magneto impulse coupling failure. Repair or install new magneto.
Spark plugs loose.
U sing new gaskets, tighten to
specified torque.
Water in fuel system. Drain fuel tank sumps, fuel lines,
fuel strainer and carburetor.
Excessive starter slippage. Replace starter adapter.
ENGINE WILL NOT RUN AT Idle speed or idle mixture Refer to paragraph 11- 37 .
IDLING SPEED. incorrectly adjusted.
Carburetor idling jet plugged. Clean carburetor and fuel strainer.
Air leak in i.ntake manifold. Tighten loose connections or re-
place damaged parts.
Spark plugs fouled by oil
Top overhaul engine.
escaping past piston rings.
ROUGH IDLING.
Idling mixture and/or mixture
Refer to paragraph 11- 37 and 11- 53.
control improperly adjusted.
11-4