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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: 93 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
5.15 Subassembly G
– Fuel Pump And Carburettor
5.15.1 Carburettor
5.15.1.1 Mandatory Updates
Check the carburettor for current tuning and jetting using the table below:
Table 5
– Carburettor Tuning
NEEDLE
JET
MAIN
JET
IDLE
JET
NEEDLE
2200
SOLID
LIFTER
32mm
Bing
2.68
2.70
2.72
2.35
0.45
Std circlip
2nd from
bottom
40mm
Bing
2.76
2.78
2.80
2.50
2.55
0.35
0.45
Std circlip
2nd from
bottom
40mm
Economy
2.80
2.25
2.35
0.45
Economy
needle
HYDRAULIC
40mm
Economy
2.90
2.45
0.45
Swelled type
3300
SOLID
LIFTER
40mm
Bing
2.80
2.80
0.35
0.45
Std circlip
2nd from
bottom
40mm
Economy
2.85
2.55
0.35
0.45
Economy
needle
HYDRAULIC
40mm
Economy
2.85
2.90
2.55
2.60
0.35
0.45
Std circlip
2nd from
bottom
Swelled type
Order any replacement parts required to achieve current carburettor tuning standards.
Refer also to Jabiru Service Bulletin JSB018. In some applications non-standard jets will be required
and are acceptable if their use is based on proper testing.
To improve cold starting the choke jet may be enlarged. Drilling to 1.2mm is recommended for
Australian applications. The choke jet is located in the bowl as shown in Figure 109 (left).
To improve the engine’s idle the idle jet port must be drilled out to 1.6mm. This is done at the factory
during assembly but is worth checking at overhaul. Figure 109 (right) shows the drilling being done by
hand. Note the air nozzle blowing into the idle jet to force the aluminium shavings from the drill out of
the carburettor.
New fuel hose must be fitted.
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 2.4mm seat is also acceptable for
2200 applications. 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. More details of this
process are included in Section Figure 113.