Jabiru 3300 - Distributor & Rotor Inspection & Adjustment

Engine Maintenance Manual
Jabiru Aircraft Pty Ltd
JEM0002-5
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
1
2
3
4
5
Dated : 2nd June 2015
Issued By: AS
Page: 63 of 103
L:\files\Manuals_For_Products\Engine_Manuals\Engine Maintenance Manual 22 & 33\JEM0002-5.docx
c. Oily, Glossy Coating:- Misfiring. Too much oil in combustion chamber. Worn cylinder piston
rings.
d. Whitish with Melt Droplets:- Mixture too lean. Leaking valves.
CAUTION
This guide is only relevant when running the engine on AVGAS. Unleaded fuels give
different plug colours which are generally unsuitable for use in evaluating engine tuning.
The plug colour reflects the most recent running of the engine – if the engine has run at idle
for some time the plug colour will reflect the mixture at idle.
WARNING
Spark plug colour is a very general guide only. Tuning adjustments must ONLY be made on
the basis of EGT or Lambda sensor results.
DO NOT ADJUST ENGINE TUNING BASED ON SPARK PLUG COLOURS ALONE
9.12 Distributor & Rotor Inspection & Adjustment
Required Tools:
Spanners / Socket Wrench
Screwdrivers
Rags
Pick and Pliers
Parts and Material:
Replacement distributor seal (if required)
Replacement shaft (if required)
Residue free cleaner
5 minute epoxy with cotton flock
Type of Maintenance:
Heavy Maintenance
Level of Certification:
L2 or LAME (A&P or LSA Repairman / Maintenance)
Return to Service:
L2 or LAME (A&P or LSA Repairman / Maintenance)
 Remove the clamps and rotors from the engine. Inspect the distributor caps, rotor button and
rotor for damage or wear.
 The rotor is glued to the distributor shaft. If it or the distributor oil seal must be replaced,
carefully work the old rotor off the shaft using screwdrivers as levers.
 Clean any residue of the old glue off the distributor shaft.
 If the distributor seal is to be replaced, remove the old seal using a pick & pliers.
 Visually inspect the distributor shaft for wear from the seal. A groove deeper than 0.5mm (in
radius) will require replacement of the shaft.
 Apply a suitable grease to the inside of the replacement seal and press it into place.
 Clean the distributor shaft and the inside of the distributor rotor using a residue-free cleaner.
 Mix a small batch of 5-minute epoxy adhesive combined with a small amount of filler (such as
cotton fibre flock). Apply a pea-sized amount of adhesive to the inside of the rotor cap. Apply
a similar amount to the rotor shaft. Press the rotor onto the shaft, ensuring it goes all the way
on. Wipe off any excess glue and allow to set.
 Test fit the distributor, ensuring it fits over the new rotor. Tighten the distributor clamps. Turn
the crankshaft through 2 full revolutions by hand, monitoring the distributor for any interference
with the new rotor.
 Re-fit the high-tension leads.