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Jabiru Aircraft
Pty Ltd
Instruction & Maintenance Manual
Jabiru 2200 Aircraft Engine
Hydraulic Valve Lifter Models
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REVISION
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Dated : June 2010
Issued By: DPS
Page: 105 of 116
L:\files\Manuals_For_Products\Engine_Manuals\Transition\JEM2204-9_I&M_unsigned.docx
13.2 Normal Operation Notes
The following are tips to ensure a long life. They are intended to bring attention to
important aspects of caring for a Jabiru 2200 engine. For details on the required work,
refer to the main body of this manual.
13.2.1
Regular Checks
With ignition and master OFF and throttle closed turn the prop by hand and observe
engine for odd noises or heavy movements.
Turn the engine over by hand before starting to check for regular compressions. If
irregular (one cylinder with lower compression than others) a leak-down or similar
pressure differential test should be done. If the results show a low-compression
cylinder, contact Jabiru Aircraft or our authorized local representative.
Compression Test:
Condition of compression can be gauged by testing the engine
with a compression gauge. The test is carried out with the engine warm, wide open
throttle,
ignitions OFF
. Turn over on starter. A reading below 90 PSI may indicate
removal of head and possibly cylinder.
Pressure Differential Test:
As an alternative to a compression test, a pressure
differential test (Leak down) can be carried out. This is a much better test of the
condition of rings, bore, head sealing and valve. This is the normal test used in aviation
and requires specific equipment.
The test is carried out with the engine in warm to hot condition. Pressure input of 80
PSI; a second gauge reads the differential. This is done with piston on TDC on the
firing stroke. Note that the propeller needs to be restrained. A differential of lower than
80/60 indicates a problem.
Problems can be better identified using the leak down:
v)
Blow by through the crankcase vent indicates worn rings or bore
vi)
Leaking from carby indicates a poor intake valve seal
vii)
Leaking from exhaust indicates a poor exhaust valve seal
viii)
Head leak indicates poor head to cylinder seal
With the problem narrowed down, correction work can more easily be carried out.
Your
Tension Wrench
should be accurate. It should be a “good” brand and have had
some method of calibration. Even new wrenches can be un-calibrated and can vary to
manufacturers claims.
The
Coil Gap
can be adjusted easily by cutting a 15mm wide strip of plastic or thin
card
(thickness .010”). Place between magnets on flywheel and coil. Check both sides,
that is each coil to each magnet (4 checks).