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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: 78 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
An alternate method for measuring valve guides is to use a Go- No Go gauge as shown in Figure 89.
The gauges must be machined very accurately to the required size. Gauges sizes of 7.04, 7.05, 7.06,
7.07mm etc are recommended. Figure 15 also shows these tools.
We strongly recommend having a specialist fit the new valve guides.
Heat the cylinder head evenly (using an oven or other uniform heat source) until the old guides can be
driven out easily.
If the head is not heated sufficiently it is possible that some metal may be picked up when the old
guides are driven out, so aim to achieve a temperature of approximately 150°C for this operation.
Once the old guides have been removed allow the head to cool naturally before sizing the holes to fit
the new guides.
Ream the valve guide holes out carefully if required until a 0.03 - 0.05mm interference fit is obtained
and then heat the head again while cooling the guides in a plastic bag in the freezer for at least an hour.
Then, working quickly, drive each guide home using a suitable tool with the head supported on an
inclined base, all as shown in Figure 88.
Make sure that the oil hole in each guide is facing up when fitted.
Reaming the guide bore to the new build value set in Table 10.
If new valve guides are fitted then the valve seats will need to be recut.