Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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Dated : 28/10/2014
Issued By: AS
Page: 82 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
Figure 94
– Valve Springs, Pushrods
Figure 95
– Valve Spring Washer Thickness
Check the pushrods for straightness: use vee blocks & dial gauge or check by rolling the rods along a
piece of thick flat glass. Check the pushrod ends for signs of wear or damage. The photo above-middle
shows a badly worn pushrod end on the left compared to a good pushrod end on the right. Replace any
bent or damaged pushrods. Pushrod length limits are given in Table 10. For hydraulic lifter engines the
215mm type is recommended for standard use as it allows greater tolerance to wear in the valve train.
Later engines use hollow pushrods to lubricate the rocker gear (Figure 94, right). Again, the 215mm
long part is recommended.
Engines equipped with roller followers use a different length hollow pushrod
– as detailed in Table 10.
Check the pushrod cover tubes for straightness and smoothness: during final assembly these slide
through the O rings in the cylinder heads and any roughness may rip the O rings, so this would be a
very good time to polish the outside of each pushrod tube and replace any bent or damaged tubes.
Pushrod tubes must be checked for wear at the O ring seal (Figure 96). Wear or damage here will
cause oil leaks and must be polished out or the tube replaced.
Figure 96
– Pushrod Tube End
Thicknes
s
