Jabiru 2200, Overhaul Manual, Page: 69 / 201

Engine Overhaul Manual Jabiru Aircraft
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JEM0001-7 Jabiru 2200 & 3300 Aircraft Engines
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ISSUE 1 2 3 4 5 6 7 Dated : 28/10/2014 Issued By: AS Page: 69 of 201
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5.10.4 Oil pump
5.10.4.1 Mandatory updates
Figure 78
– Port Plate Evolution

Jabiru Service Bulletin JSB004 also refers to this part. The original design for the oil pump port plate
could suffer from cavitation which in turn caused pressure spikes and damage to the oil cooler. During
overhaul old oil pumps must be modified as detailed below or have a new port plate fitted.

Figure 78 above shows 3 different styles of oil pump port plate.
- Plate #1: This is the original design, with the port plate outline unbroken by indentations.
- Plate #2: This is an intermediate design. At the top of the outlet port and at the bottom of both ports
there are small tapered indentations. Some versions of this plate will only have the larger
indentation at the top of the outlet port, and not the pair at the bottom. Again, this design plate must
be reworked to be equivalent to Plate #3.
- Plate #3: This is the current plate design. The small indentations have been replaced by a large
tapered cut at the top of the inlet port. Changes have also been made to the other side of the plate
(which faces the crank cases) to remove sharp edges & reduce cavitation.

Plates like Plate #1 & Plate #2 can be modified to be equivalent to Plate #3. Where the plate already
has the indentation on the top of the outlet port, care must be taken to leave at least 2mm between it
and the end of the new cut on the inlet side.
Figure 79
– Modified Port Details

This work can be carried out by hand using a Die Grinder or similar tool. Jabiru Aircraft can provide a
1:1 template if required. This work requires the disassembly of the oil pump and should only be carried
out by an approved person with appropriate skills.

Alternatively a new port plate may be fitted.
1
2 3
Inlet port.
Outlet port.
New Cut
Indentations