Jabiru 3300 - TROUBLE SHOOTING; ENGINE WONT START

Engine Maintenance Manual
Jabiru Aircraft Pty Ltd
JEM0002-5
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
1
2
3
4
5
Dated : 2nd June 2015
Issued By: AS
Page: 82 of 103
L:\files\Manuals_For_Products\Engine_Manuals\Engine Maintenance Manual 22 & 33\JEM0002-5.docx
10 Trouble Shooting
10.1 Engine Won't Start
Possible Cause
Remedy
1)
Ignition OFF
Switch ON (Note spark will be produced when the
primary coil is NOT earthed – i.e. ignitions are ON when
switches are OPEN).
2)
Spark plug gap too large
Adjust gap and/or or renew plugs
3)
Closed fuel tap or clogged filter
Open tap, renew filter, check fuel system for leaks
4)
No fuel in tank
Refuel
5)
Wrongly connected high tension leads
Connect as shown on leads
6)
Starting Speed too low, faulty or discharged
battery
Recharge or replace battery
7)
Coil to Magnet gap too wide
Adjust
8)
High tension leads loose or damaged
Check or renew connections
9)
Dampness in distributors
Thoroughly dry internally
10)
Spark plugs damp due to condensation
Thoroughly dry both inside and outside of plugs
11)
Plug face wet by fuel due to excessive
actuation of choke or overflow of carb
Dry spark plugs, trace possible faults in fuel system or
over flow of carb.
12)
Float valve dirty or jammed
Clean or renew float valve
13)
Jets in carb. clogged
Clean jets
14)
Water in carb.
Drain & clean carb.,fuel line & filter. Water drain fuel tank
15)
Insufficient compression
Trace pressure loss & repair if necessary
16)
Engine damage
Inspect oil strainer filter & oil filter for metallic particles. If
present, an engine overhaul may be necessary.
10.2 Engine Idles Unsteadily After Warm-Up Period: Smoky Exhaust
Possible Cause
Remedy
1)
Choke activated
Close choke
2)
Float valve dirty, jammed or worn
Clean or renew float valve
3)
Intake manifold leak
Tighten all connections, renew faulty items
10.3 Engine Runs Erratically or Misfires Occasionally
Possible Cause
Remedy
1)
Spark plug failure
Check plugs, clean inside & outside, adjust electrode
gap. If necessary, renew plugs
2)
Faulty HT leads
Dry damp leads, renew damaged leads
3)
Faulty ignition unit
Renew ignition unit
4)
Clogged fuel filter
Renew fuel filter
5)
Carburettor sense tube not connected
The Bing carburettor has a sense port which helps it
control the fuel mixture. This is a small nipple on the
carburettor which must be connected via a small tube to
a fitting in the filtered side of the carburettor heat box.
10.4 Full Power Static RPM Below Specifications
Possible Cause
Remedy
1)
Low engine power
See Section 10.7
2)
Unsatisfactory propeller
Refer to engine installation manual for prop requirements
3)