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Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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Dated : 28/10/2014
Issued By: AS
Page: 156 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
Figure 201
– Engine Ground Running Rig
Fit a suitable propeller.
Carrying on from the last point, if the engine is being run on the ground then a
suitable “club” prop must be fitted. A club prop must allow the engine to reach a minimum of 3250 RPM
and a maximum of 3400 RPM. A prop which does not meet either of these limits will not load the
engine correctly and can initiate long-term operating issues.
8.3 Ground Run-In & Test Procedures
Test running is an essential part of the full overhaul or top end overhaul process. It is worth spending
extra effort during this testing to catch any small issues which may grow more serious in operation.
At the completion of assembly of the engine after overhaul, it is recommended that the engine be
mounted upon a suitable test stand for its initial or run-in operation.
Alternately the engine may be re-fitted to the aircraft and run. While the very first runs may take place
on the ground in an airframe, any further testing must be carried out in the air to ensure sufficient airflow
for engine cooling.
The run-in serves a two-fold purpose; first, to seat piston rings and burnish any new parts that have
been installed and second, to give the operator control over the first critical hours of operation, during
which time he can observe the functioning of the engine by means of the test cell instruments or, if the
engine is re-fitted to the aircraft, the aircraft instrumentation.
Also at this time any malfunctions can be corrected and oil leaks repaired.
The first few hours after an overhaul are critical for the rest of the life of the engine and no effort should
be spared to conduct engine running according to the following criteria. What follows is a very specific
set of power settings, typically periods of full power operation followed by reduced power periods to
ensure correct cooling. If these instructions are followed to the letter the rings will bed into the cylinders
correctly and this will result in a much more pleasant engine with a decent life expectancy provided that
our daily inspection and maintenance procedures are followed. A sample ground run-in procedure is
included in the engine overhaul booklets in Section 9 below.
Thermocouple Monitor for
Carby Inlet Air Temp
Tacho
Oil Temp & Pressure
CHT Gauges X6
Oil Cooler