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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: 114 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
7.3.3 Through-Bolt Nuts
Count out a set of engine through-bolt nuts.
12-point nuts with washers must be used on all cylinder base applications.
Check that all nuts and washers are clear of the radius on the base of the cylinder barrel. Figure 139
(right) shows how using certain (large-flange) nuts can result in the nut hitting on the radius at the
cylinder base. To avoid this it is necessary to use a
“Small-flange” nut per Figure 139 left, or a nut
which has been modified
– the diameter of the nut base can be reduced in a lathe. This requirement
also applies to the washers used: these parts are custom made for Jabiru from hardened steel
–
substitutes must not be used.
Later engines (See Section 13 for serial number ran
ges) use 7/16” hardware on the engine through
bolts and studs. On these parts a custom-made nut (shown in Figure 140) is used. At overhaul these
are to be removed and
7/16” 12-point nuts & washers fitted (Figure 140 right).
Figure 139
– Through Bolt Nut Installation Detail
Figure 140
– 12-Point Nuts, 7/16” Hardware (on right)
Nut on assembled engine. Note “new type”
barrel, small-flange 12-point nut & washer
shown.
3/8” MS21042-
style nut
3/8” 12-Point nut
7/16” nut, custom stainless
7/16” nut, 12-Point (& washer)