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