Jabiru 3300 - ENGINE RUNS TOO HOT - OIL TEMPERATURE ABOVE 110 OC (230 oF); UNSATISFACTORY POWER OUTPUT

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: 83 of 103
L:\files\Manuals_For_Products\Engine_Manuals\Engine Maintenance Manual 22 & 33\JEM0002-5.docx
10.5 Engine Runs Too Hot - Oil Temperature Above 110
o
C (230
o
F)
Possible Cause
Remedy
1)
Too much oil in crankcase
Check oil level & adjust if necessary
2)
Low oil level
Check oil level & add oil if necessary
3)
Poor quality oil
Oil change, use specified oil
4)
Clogged oil filter
Change filter
5)
Excessive piston blow by
Common reason: worn or sticking piston rings, complete
engine overhaul necessary
6)
Faulty bearings
If metallic particles are present in oil, complete engine
overhaul necessary
7)
Faulty oil temperature gauge
Exchange gauge
10.6 CHT Reading Error
Possible Cause
Remedy
1)
Faulty gauge, sender or connection
Check gauge & sender – replace with known good items
if possible.
Reverse polarity between gauge and sender & re-test.
2)
Improper temperatures
Verify original reading using a second thermometer –
such as a hand-held infrared thermometer.
3)
Cold junction temperature
The standard gauges used in Jabiru Aircraft assume that
the cold junction (where the thick thermocouple wire
connects to the standard wire leading to the instrument)
is at around 25°C. Ensure the junction is not exposed to
excessively hot or cold air for best results.
10.7 Unsatisfactory Power Output
Possible Cause
Remedy
1)
Ignition failure
Check ignition circuits; check wiring and pick-ups;
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
Re-fuel with specified fuel
5)
Incorrect throttle adjustment
Re-adjust throttle fitting
6)
Leak in air intake
Check and tighten all connections, check carby sockets.
7)
Carburettor diaphragm damage
renew diaphragm
8)
Hydraulic Lifter stuck / collapsed
Replace lifter(s)
9)
Tachometer Reading Error
Check RPM with calibrated gauge (such as hand-held
optical gauge).
10)
Carburettor heat not turning off
Check / adjust carburettor heat mechanism
11)
Choke not turning fully off
Check / adjust choke mechanism.
12)
Unsatisfactory induction system
Check induction system for sharp edges, rough corners
etc. Refer to engine installation manual.