Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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Dated : 28/10/2014
Issued By: AS
Page: 75 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
Figure 85
– Cracking Between Valves, Recessed Cylinder Spigot
5.11.3 Valves
Top End Overhaul:
Visually inspect each valve for any signs damage: this may include burnt seats,
scoring of the stem or necking of the stem. This is a useful check as it will indicate very poor
maintenance. Valves are replaced at both top end and full overhauls.
Check that the heads of the valves protrude into the combustion chamber by the amount indicated in
the drawing below
– if the heads of the valves are recessed into the roof of the combustion chamber
then new cylinder heads must be fitted. It is recommended that overhaulers do not attempt to replace
the valve seats in the heads as this job requires special tools and extreme temperature differences.
If refacing is required the inlet and exhaust faces should both be ground to 45°. Both valve and seat
face have a parallel contact of 45° - there is no undercutting.
Figure 86
– Valve Measuring