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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: 77 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
5.11.4 Valve guides
Figure 88
– Valve Guides
Top End Overhaul:
start by holding each valve partly open and feeling for wear in the guide as shown
at right
– there should only be a small amount of up and down (see direction arrow in Figure 88)
movement in the head of the valve.
Check each valve in this manner.
Use a micrometer to measure the valve stems and the valve guide bores and calculate the clearance: it
must be within the limits set in Table 12. If the clearance is greater than this then new valve guides
must be purchased and fitted.
Note that the values given above are maximums
– there is no point returning a cylinder head to service
if it has valve guides already worn close to the maximum allowable
– before the engine has completed
its next cycle the guides will be unserviceable. Refer also to Section 12 for details.
It is unusual for guides to need to be replaced after 1 cycle however it can happen.
Figure 89
– Measure Guide Wear (Telescopic Gauge Left & Middle, Go-No-Go Gauge Right)
Check the valve for movement