Engine Troubleshooting Matrix

• Engine will not turn over
1. Starter Battery charged.
2. Engine flooded - rem plug and turn over.
3. Engine and / or bearings frozen.
• Engine turns over slowly/erratically.
1. Starter battery charged.
2. Start adapter slipping.
3. Starter too small for engine size
4. Engine oil congealed/carbon buildup.
5. Engine flooded.
• Engine turns over normally but will not start
1. Glowplug lit and not flooded
2. Mixture too lean
3. Carb closed too far
4. Fuel level sufficient.
• Engine pops and / or fires but will not start
1. Low mixture too lean.
2. Plug not sufficiently lit.
3. Carb closed too far.
• Engine starts but stops when glow driver is removed.
1. Low mixture too rich.
2. Plug too cold.
3. Plug inoperative without voltage.
• Engine starts, speeds up then quits
1. Low mixture too lean (with glowdriver on).
2. Low mixture too rich (with glowdriver off).
• Engine starts but slows down when glowdriver is removed.
1. Normal operation
2. Excessive drop - glowplug too cold.
• Engine hesitates / puffs smoke when accelerating.
1. Excessive idle time
2. Mixture balance between low and high needles.
3. Engine cold (normal operation).
• Engine starts but turns in wrong direction.
1. Starter polarity
2. Low mixture too rich.
• Engine looses power during flight
1. Mixture too lean
2. Engine mixture adjusted when cold
3. Cooling system inadequate / damaged.
4. Excessive top end main blade pitch
5. Engine too small for helicopter
• Engine mixture erratic.
1. Exhaust system blocked
2. Fuel system has leak
3. Muffler / pipe connection loose
4. Dirt in carburator and / or fuel filter
5. Air leak on carburator
• Engine quits in hover
1. Glow plug died
2. Fuel tank empty
3. Hover mixture too lean.
4. Engine mechanical damage.
• Engine runs inconsistently
1. Contaminated fuel
2. Mixture needles not balanced
3. Engine mechanically worn out

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Original Text by Don Chapman published in MHT.
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