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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: 115 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
WARNING
MS21042-type nuts must be replaced with 12-point nuts at overhaul or whenever the barrel is
removed for maintenance.
Assembly with nut hitting barrel radius can lead to engine failure
7.3.4 Cylinder heads
Each cylinder head should be clearly marked with a number using permanent marker or similar
– these
numbers can be cleaned off at the end of the build using tool cleaner spray. In the meantime the
numbers will allow the overhauler to easily identify cylinder head / piston / rod / cylinder sets. The
numbering system of the cylinders for the engines is given in Figure 3.
Note that the 2200 engine uses two different cylinder heads
– one for cylinders 1 & 4 and another for 2
and 3 - Figure 141 refers. The Jabiru 3300 engine uses the same cylinder head for all cylinders
–
though they are fitted with different induction or exhaust pipes depending on where they are fitted to the
engine.
Figure 141
– Cylinder Head Comparison (2200 head on left, 3300 on right).
Where second-hand heads are used they will have had their valve seals tested as detailed in Section
5.11.5. This process also applies when fitting new cylinder heads: the seal of each valve must be
tested as detailed in Section 5.11.5. If the seal is not good enough then the valve and seat will need to
be lightly cut. After cutting ensure that the cylinder head and valves are thoroughly washed to remove
all residue of the valve cutting paste.
Where new valves are used, inspect both ends for sharp edges and burrs which may damage the valve
spring washers. Polish off any edges or burrs found.