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 TM 5-4110-217-14
Table 3-3. Troubleshooting - Continued
MALFUNCTION
MALFUNCTION
TEST OR INSPECTION
TEST OR INSPECTION
CORRECTIVE ACTION
CORRECTIVE ACTION
Step 3.
Inspect and test starter assembly.
5.
ENGINE STOPS SUDDENLY.
Replace defective starter assembly
Step 4.
Inspect and test starter solenoid
Step 1.
Check fuel supply
Replace defective starter solenoid.
Refill fuel tank with gasoline
2.
ENGINE CRANKS BUT FAILS TO START.
Step 2.
Check quality of gasoline for possible water, dirt or
Step 1.
gum.
Check for empty fuel tank
Drain and refill fuel tank with proper quality
Refill fuel tank if empty or low.
Step 2.
Check for dirty fuel filter, broken or clogged fuel line
gasoline.
Step 3.
Clean or replace filter and/or fuel line
Check engine for vapor lock
Step 3.
Check and test ignition system for timing, spark plug
Re-start engine after 15 minutes.
gap, worn points, Improper gap setting, bad ignition
Step 4.
Check for defective Ignition system components.
coil or condenser, faulty spark plug wires
Clean, adjust, repair or replace defective
Tighten, adjust or replace plugs, points, coil or
components
condenser, spark plug wires
6.
ENGINE WILL NOT IDLE SMOOTHLY.
Step 4.
Check for proper functioning of carburetor
Step 1.
Clean and adjust carburetor. Replace defective
Check setting of carburetor high speed needle
valve.
carburetor.
Adjust high speed needle valve
Step 5.
Inspect and test for defective fuel pump
Step 2
Check quality of gasoline for water, dirt or gum
Replace fuel pump.
Drain and refill with proper gasoline
Step 6.
Check for leaky intake manifold.
Step 3.
Inspect fuel lines for restrictions or leaks
Replace unrepairable gasket or intake manifold.
Clean and replace lines.
3.
ENGINE MISSES OR RUNS ERRATICALLY.
Step 4.
Check for defective ignition system components
Step 1.
Clean, adjust, repair or replace defective
Check for water or dirt in gasoline or for improper
grade of gasoline
components
Drain and refill tank with proper fuel.
7.
ENGINE OIL PRESSURE LOW.
Step 2.
Check carburetor for proper functioning
Step 1.
Adjust carburetor.
Check oil level and oil quality (too light or dilute)
Step 3.
Inspect for loose or defective spark plug leads.
Fill crankcase with proper oil according to
Tighten, clean or replace spark plug leads.
current lubrication chart.
Step 4.
Check for loose or defective spark plugs.
8.
ENGINE OVERHEATS.
Tighten, clean or replace spark plugs.
Step 5
Step 1.
Check for defective magneto.
Check for overload on engine
Clean, regap, or replace points
Reduce load.
Step 6.
Step 2.
Check for defective fuel pump.
Check for low crankcase oil supply.
Replace fuel pump.
Replenish oil to proper level
Step 7.
Step 3.
Check for leaky manifold
Check for correct grade and quality of oil
Replace gasket or manifold.
Drain and refill with proper oil.
Step 4.
Check engine for restricted air cooling circulation.
4.
ENGINE KNOCKS OR DEVELOPS EXCESSIVE NOISE.
Ventilate engine for sufficient supply of fresh air
for cooling and combustion. Clean dirty or oily
Step 1.
Check oil level
cooling fins.
Add oil to crankcase
Step 5.
Check for restricted exhaust
Step 2.
Check to see if oil may be diluted.
Clean or free restriction.
Drain crankcase and refill with proper oil
Step 6.
Check for too rich fuel air mixture
according to current lubrication chart
Adjust carburetor high speed needle valve.
Step 3
Check for proper grade of gasoline
Step 7.
Check for faulty engine timing
Drain and refill with proper grade.
Time engine
Step 4.
Check engine for proper timing.
9.
EXHAUST SMOKE EXCESSIVE.
Time engine.
Step 5.
Inspect for worn muffler.
Step 1.
Check for improper grade of engine oil.
Replace muffler.
Drain and refill. Refer to current lubrication
chart
10. ENGINE LACKS POWER.
Step 1.
Inspect air cleaner for clogging.
Service air cleaner
Step 2.
Check for defective governer.
Adjust governer.
3-9
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