Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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Dated : 28/10/2014
Issued By: AS
Page: 91 of 201
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5.14 Subassembly F
– Gear case and distributors
5.14.1 Gear Case & Distributors
Figure 107
– Distributor Gears & Case
5.14.1.1 Mandatory Updates
Check the inner boss of the main timing gear case around the distributor drives for a broached cutaway
as shown arrowed in yellow above left. If this cutaway is not present it must be ground into the case
before it can be returned to service. Use a Dremel tool with a cutting burr or a hand file to make the
cutaway as shown above left: it should measure 12mm wide and 3mm deep when complete. This must
be done for both distributors.
5.14.1.2 Cleaning
Scrape all gasket material from the timing case flange with a Perspex scraper.
Check that all threads are clean
– use a tap if necessary.
Clean all components thoroughly with kerosene and dry.
5.14.1.3 Inspection and Repair
Check the rivets that hold the distributor gears to the shafts as shown above right and replace any that
are loose with new 3/16” x 5/16” Monel rivets, taking care to drive the pin out of the centre of the rivet
on completion of fitting.
Check gears and gear teeth for any marks or scoring.
Check the shafts for corrosion and seal marking and polish as required. Measure the distributor shaft to
bearing clearance: it must be within the limits of Table 12 to be returned to service.
If deep score marks (from the seal) are present (as shown in Figure 107
– right) the shaft must be
replaced.
Check the interior of the distributor cap, looking for cracks, corrosion and making sure that the carbon
brush in the centre of the cap is fitted and in good condition.
Check the high-tension leads and replace any which have chafing or other damage. Damage needing
replacement is rare, however chafing must be guarded against carefully.
Check the fit of the high-tension lead caps onto the distributor and spark plugs. Visually check the
metal contacts inside the caps. If the fit is loose or if the contact is visibly damaged as shown in Figure
108 then a screwdriver or similar must be used to re-shape the contact (it should be round) and to re-
size it for a better fit
– for a spark plug the diameter of the contact needs to be reduced to tighten while
for a distributor cap it needs to be expanded. Each cap should fit with a clear “click” as it connects to the
distributor cap or spark plug.
Distributor gear
Broached cutaway