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Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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Dated : 28/10/2014
Issued By: AS
Page: 108 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
7.3 Subassembly C
– Pistons, cylinders and cylinder heads
In this subassembly task the piston rings will be gapped and fitted to the piston, the front gudgeon pin
circlip will be fitted to the piston and finally the piston will be inserted into the cylinder ready for later final
fitting to the connecting rod.
7.3.1 Pistons
Several different variations of piston have been used in Jabiru engines. In some instances it may be
required to partially replace an engine’s pistons (i.e. replacing 2 pistons in a 4-cylinder engine) during
maintenance. In this case the overhauler must accurately weigh reciprocating part assemblies per
Section 5.11.1.4.
For in-service maintenance purposes it is acceptable practice to fit piston assemblies in pairs
– i.e.
pistons #1 and #2 may weigh 529g and 530g respectively while pistons #3 and #4 weigh 533g and
532g. However where possible it is recommended that all reciprocating assemblies be weight matched.
Where all pistons in an engine are replaced the limits detailed in Section 5.11.1.4 apply.
Figure 129
– Thrust Direction Markings For Pistons
Figure 130
– Installation of Pistons With Valve Relief
Current pistons feature modifications to the piston crown to allow
the piston to prevent a stuck valve impacting the piston.
Assembly for these parts is the same as for older piston types and
is as detailed herein. However, note that these parts are handed
– with a different part number being used on the left side of the
engine compared to the right. When confirming piston orientation
note that the valve relief is always on the sump side of the engine
as shown in