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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: 96 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
Figure 113
– Fitting New Float Needle Seat
The float bowl needle seat must be checked. 3300 engines use a 2.4mm diameter, specially shaped
orifice in this part while the 2200 engine uses 2.0mm (though the 2200 can also use a 2.4mm seat if
required). Figure 30 shows the tools needed to change the seat which is located in the carburettor
body above the float needle. As noted at Figure 30, if the seat is to be changed a tap is used to remove
the old part and a special nylon drift used to install the new.
Figure 114
– Carburettor Jets & Diaphragm
During re-assembly ensure that the atomiser, needle jet, jet carrier, washer and main jet are installed in
the correct orientation and correct order as shown in Figure 114 (left). Also ensure that the tag on the
diaphragm is aligned and fitted correctly to the socket in the carburettor body as shown in Figure 114
(right)
Check the idle mixture screw. Screw fully in then screw it out 1 turn for 2200 and 3300 engines. The
idle screw is shown in Figure 112.
The float level must be set at 11-13mm down from the lip of the bowl. Adjust the brass tang of the float
as required. An alternate setting method is to turn the electric fuel pump on and lift the floats, noting at
what float height the flow cuts off.
Carefully check the condition of the rubber coupling between the carburettor and the engine.
Particularly on installations where a “pod” filter is used this coupling can crack – and the cracks can be
hard to spot.
Set the throttle butterfly idle stop so that the butterfly is just cracked. This setting will then need to be
confirmed during the engine test run.
5.15.2 Fuel Pump
5.15.2.1 Inspection & Repair
Top End Overhaul:
check fuel pump diaphragms and gaskets, replace as required.
Atomiser
Needle
Jet
Jet
Carrier
Main Jet
Washer
Using thread tap to remove old seat
Fitting new seat using Nylon tool