Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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Dated : 28/10/2014
Issued By: AS
Page: 158 of 201
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8.5 Troubleshooting
Table 8 - Troubleshooting
Symptom
Suggestion
Poor cold starting
1. Check starter motor and overhaul if required
2. Check battery health
3. Old spark plugs or plug gap too large
4. Battery too far from starter motor, loss of power due to cable resistance.
5. Incorrect oil grade for the temperature. Multigrade preferred.
6. Confirm tuning correct
7. Do not use choke & throttle together during start attempts.
8. Check choke jet is drilled to approx 1.2mm
Low oil pressure
1. Oil pressure relief valve needs cleaning or re-seating
2. Gauge error
3. Cavitation on oil pump feed
– oil pickup needs re-sealing
4. Excess internal clearances
High CHT
1. CHT sender not perfectly centred over spark plug.
2. Poor installation of engine to aircraft. See Jabiru Engine Installation Manual
3. Valves not seating
– adjust
4. Tuning incorrect
5. Propeller sizing wrong
– engine overloaded
High oil usage
1. Worn valve guides
2. Worn or stuck piston rings
3. Worn, glazed or out-of-round cylinder barrels
4. Poor engine installation
– incorrect oil vent location
5. Use of oil additives
High oil temperature
1. See rocker chamber vent Service Bulletin (for certain 2200 engines)
2. Poor engine installation - See Jabiru Engine Installation Manual
3. Oil level too high
“Missing” in flight
1. Carby ice
2. Ignition coil gap needs adjusting, defective coil
3. Replace spark plugs
4. Check ignition leads for fretting or shorts
5. Carburettor float level too low or too high.
6. Tuning incorrect
Carburettor flooding
1. Electric fuel pump giving too much pressure (must be less than 4psi)
2. Carby float needle seat scratched or incorrect size
Broken through-bolts
1. Detonation, most likely due to incorrect tuning
2. Over-tensioning
3. Re-use of bolts / studs at overhaul.
Flywheel Attachment
Damage
1. Incorrect propeller choice
2. Prop strike or other engine damage
3. Detonation
4. Loose or poorly maintained propeller
5. Incorrect Loctite / installation
Valve Failure
1. Carburettor tuning
– running too lean
2. Poor valve adjustment
3. Excess valve guide wear
Excess Metal in Oil Filter 1. Corrosion in cylinder barrels
2. Dirty oil