64
AeroVee 2.1
Rev Z. 01/14/2015
Sonex Aircraft
LLC
© 2014 All Rights Reserved
Unsatisfactory power output
Possible Cause
Remedy
1) Ignition failure
Check ignition circuits; Check wiring and /or replace
ignition units
2) Too much oil in crankcase
Check oil level & adjust if necessary
3) Insufficient fuel supply
Check fuel supply system
4) Fuel not according to specifications
Refuel with specified fuel
5) Incorrect throttle adjustment
Readjust throttle setting
6) Leak in air intake
Check and tighten all manifold and Carb
connections
Low oil pressure
Possible Cause
Remedy
1) Insufficient oil in sump
Check oil level and top as necessary
2) High oil temperature
Improve engine cooling
3) Faulty pressure gauge, sender or wiring
Check gauge, sender & wiring. Replace if necessary
4) Faulty crankshaft bearings
Engine overhaul
5) Oil Pump plate on Incorrectly
Properly install oil pump cover
Engine Keeps Running with Ignition Off
Possible Cause
Remedy
1) Faulty ignition switch
Check switch & cables.
2) Overheated engine
Conduct cooling run at 900 RPM
3) Bad fuel or octane rating too low
Refuel with recommended fuel
Excessive oil consumption
Possible Cause
Remedy
1) Worn, broken or poorly fitted piston rings
Repair or engine overhaul necessary
2) Poor oil quality
Oil change, use specified oil
3) Worn valve guides
Repair of cylinder head necessary
4) Oil leaks
Seal leaks
Knocking under load
Possible Cause
Remedy
1) Octane rating of fuel too low
Use fuel with higher octane rating
2) Spark plug fitted without sealing washer
Ensure one sealing washer on each plug
3) Heavy carbon deposits
Remove cylinder heads & remove deposits in combus-
tion chamber
Engine Hard to Start at Low Temperature
Possible Cause
Remedy
1) Starting speed too low
Preheat engine
2) Low battery charge
Charge or replace battery
3) No spark
Check ignition gaps and adjust
4) Lean or rich mixture
Adjust AeroCarb. See AeroCarb manual.
TROUBLESHOOTING
