Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
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6 7
Dated : 28/10/2014
Issued By: AS
Page: 88 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
5.13.2 Flywheel/Starfish Attachment
Inspect the fit of the dowels between the crankshaft and flywheel:
-
Normally the dowels will remain in the crankshaft when the flywheel and gear are removed. If any
dowels come out of the crank assess the fit by inserting a new dowel: the correct fit of dowel into
crank is an interference fit: the parts require a firm tap from a copper hammer to assemble.
-
Assess the fit of the dowels into the crank timing gear: a mild interference fit where the parts can be
assembled by light hammer taps is the minimum acceptable fit.
-
Where equipped, assess the fit of the dowels into the flywheel spacer / vacuum pump drive: a slip fit
where the parts can be assembled by hand but no movement can be felt between the parts is the
minimum acceptable fit.
-
Assess the fit of the dowels into the flywheel (or starfish, where equipped). An interference fit where
the parts must be assembled by firm hammer taps is the minimum acceptable fit.
Unacceptably loose fits require the replacement of parts.
Inspect the condition of the flywheel attachment holes. Figure 102
shows a “Starfish” which was
damaged by a prop strike: it can be seen that the screw and dowel holes are elongated. This part must
be replaced. Elongation can be checked by placing a tapered round item in each hole
– such as a
suitably sized punch or pen
– to identify any damage.
Figure 102
– Damaged Flywheel “Starfish”
5.13.3 Starter Motor
5.13.3.1 Mandatory Updates
Older (Black) starter motors were less powerful. It is recommended that these be replaced at overhaul.
