Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
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Dated : 28/10/2014
Issued By: AS
Page: 195 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
Figure 208
– 15/64” Drill (Left), 6mm Ream (Centre), UNF Cap Screws (Right)
12.4.2.4 Procedure
12.4.2.4.1 Preparation
This procedure is normally s
cheduled to happen during the engine’s major overhaul – that is, when the
engine cases have been split and the crank removed.
If required, it is possible to drill the crank while it is still in the cases. To do this the timing gearbox must
be removed to allow removal of the cam gear and to expose the crank. Care must be taken to ensure
no swarf is allowed to enter the engine, and the engine must be restrained & supported as noted below.
The photographs used in this procedure were taken on a bench to give an idea of the procedure
involved. In practice, a good quality drill-press must be used. The engine/crankshaft or flywheel must
be carefully aligned with the drill axis and restrained to ensure it does not move.
12.4.2.5 Crankshaft.
The crankshaft should be drilled first. The drilling guide is a close fit on the end of the crankshaft and
should be placed gently by hand or pulled in squarely using the cap screws. Care must be taken, as
attempting to force the fixture onto the shaft may damage the crank. Line up the small hole in the
fixture with the corresponding hole on the crankshaft.
Figure 209
– Guide positioned on crankshaft.
The 4 cap screws will need to be arranged as shown above so that they don’t foul the drill. As each
hole is drilled move two of the screws around so the next dowel hole can be accessed. Always keep
two of the bolts tight so the guide can’t move.
Positioning hole in fixture
– align with
timing hole in crankshaft.
Dowel hole
– there are 3 of these on the fixture.
Bolt hole
– there are 6 of these on the fixture
