Through-Bolt Nuts - Jabiru 2200 Overhaul Manual

Engine Overhaul Manual
JEM0001-7

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 ranges) 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).
3/8" MS21042-
style nut
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Jabiru Aircraft
Figure 139 – Through Bolt Nut Installation Detail
3/8" 12-Point nut
7/16" nut, custom stainless
Figure 140 – 12-Point Nuts, 7/16" Hardware (on right)
5 6 7 Dated : 28/10/2014
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
Nut on assembled engine.
barrel, small-flange 12-point nut & washer
shown.
Issued By: AS
Note "new type"
7/16" nut, 12-Point (& washer)
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