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Engine Maintenance Manual
Jabiru Aircraft
Pty Ltd
JEM0002-5
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
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Dated : 2nd June 2015
Issued By: AS
Page: 30 of 103
L:\files\Manuals_For_Products\Engine_Manuals\Engine Maintenance Manual 22 & 33\JEM0002-5.docx
and, using a light, inspect the induction manifold for excess inhibitor oil accumulation. Remove
carburettor and clean manifold if required.
WARNING
Failure to remove all inhibitor from carburettor bowl may lead to engine stoppage. Ensure
bowl is clean before first flight.
Remove ALL plastic bungs on engine before starting. Bungs are fitted to the exhaust,
carburettor, crankcase oil vent and fuel pump.
The engine idle speed cannot be set accurately at the factory as the engine is run on a
Dynamometer only. Therefore it is necessary to adjust the throttle idle stop(s) to obtain the
appropriate RPM (Section 3.10.1) when engine is warm before first flight. Note that as the
engine run-in process progresses idle speed will gradually increase so initial idle should be set
low
– within practical limits
WARNING
Ensure engine does not stall when throttle is set to idle. While cold, test by pulling BOTH
throttle levers against the idle stop.
VARY your RPM when flying with a new engine.
Do not “Baby” a new engine. The purpose of breaking in an engine correctly is to ensure a long
reliable life. All moving parts need freeing up especially piston rings to cylinder walls. This is
best accomplished when the greatest B.M.E.P. (Break Mean Effective Pressure) occurs. That
is at 75% power and above. Early running of an engine should include periods at high RPM
and power settings.
Failure to operate at realistic power settings could be detrimental to engine condition & long-
term performance.
Always take off using full power
– especially when the engine is new.
Avoid heat build up
– monitor CHT and oil temps. Note that Initial temps will be elevated due to
the friction of a new engine. Careful monitoring by the pilot is needed during this initial period to
ensure long life of the engine and its components.
CIRCUIT WORK is a good sequence for initial run in work.
i)
Abbreviate circuits initially
ii)
Step climbs, climb at shallow angles & higher airspeeds to reduce engine temperatures
iii)
Do not carry out glide approaches
iv)
Gradually reduce power
v)
Avoid sudden heating up and sudden cooling down
Wherever practical, climb at a higher airspeed to assist engine cooling. For example, an
aircraft with a best climb speed of 65 knots can often be climbed at around 80-85 knots with
minimum impact on climb rate
– although this varies depending on the airframe. At the higher
speed setting the engine has much more cooling air available and revs higher. These
conditions provide the engine with a significantly improved environment and generally both
improve performance and reduce temperatures.
Note that all engine temperatures can be expected to drop noticeably when the new engine
run-in oil is replaced with standard oil.
5.11
Engine Installation
Air cooled engines require careful design and tuning of the installation in order to operate at
their best.
Ensure that installations are designed in consultation with the Jabiru Engine Installation Manual
and that all installation targets (for cooling, EGT, RPM etc) are met.
WARNING
Improper installation can cause severe engine damage and engine stoppage. It is the
Operator’s responsibility to ensure that all installation targets are met. Damage to engines
caused by installation issues may not
be covered by Jabiru’s Limited, Express Warranty.