Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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Dated : 28/10/2014
Issued By: AS
Page: 61 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
Figure 65
– Crankshaft Measurement
Measurements should be taken at several points around each journal and averaged.
Note that it is unusual to find any significantly out-of-round journals.
Check the oil holes in each journal (main and big end) for a radius. If a radius is not present then use a
fine linishing or polishing wheel to create a radius
– there must be no sharp edges that could form a
stress point anywhere on the crankshaft.
Check around the centre holes in the crank web for a radius: once again there must be no sharp edges
that could form a stress point anywhere on the crankshaft. Older engines are more susceptible to this
but new cranks should still be checked.
A polishing wheel in a Dremel can be used to put a radius on the crank centre holes - see Figure 66.
The overhauler must also check all oil galleries in the crankshaft are clear before installation. This can
be done by feeding a piece of steel wire through the galleries. Note that this is also necessary with
brand-new crankshafts to ensure that there is no swarf or other debris lodged in a gallery.
Figure 66
– Radius Crank Centre Holes
5.9.2 Connecting rods
5.9.2.1
Mandatory updates
Connecting rods must be the current machined billet steel type as shown in the photo below.
Older alloy or alloy-steel rods must be replaced with new steel rods.
Figure 67
– Steel Con-Rod
The crankshaft and propeller flange must now be
inspected for structural integrity with MPI (Magnetic
Particle Inspection).