Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
1
2
3
4
5
6 7
Dated : 28/10/2014
Issued By: AS
Page: 111 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
Figure 135
– Over-Compressed and New Clips
WARNING
Clips that are loose will rotate in service and wear the piston circlip groove away resulting in a
loose fit and, eventually, the gudgeon pin being liberated & engine failure.
Circlips must be fitted and inspected correctly or engine failure will result.
Fit the circlip on the propeller flange side of the pistons now
– the second circlip will be fitted on
assembly to the connecting rod.
Oil the pistons and cylinders using engine oil.
One at a time, fit the compression rings (the first and second ring of each piston) into their cylinder.
Use a piston to press the rings down into the bore
– this will position the rings properly perpendicular to
the bore, making sure they are not at an angle. Using a feeler gauge, measure the ring gap of each
ring and record the value in the build sheet. Ensure the gaps are within the limits given in Table 12.
0.50
– 0.60mm is typical in a 97.60mm bore though the gap will vary depending on the exact size of the
barrel. Figure 136 shows this process. The end gap can be adjusted if required, however this is a
standard engine-building process and will not be described here. Care must be taken to ensure that
pistons, rings and cylinders are maintained in sets so that the engine is eventually assembled using
parts which have been measured together
– not with the rings which were checked in cylinder #2 being
fitted to cylinder #4.
Figure 136
– Checking Piston Ring Gap
Measuring Ring Gap
Fitting rings to barrel