INSTRUCTION AND MAINTENANCE MANUAL FOR ... - Jabiru Aircraft

Jabiru Aircraft Pty Ltd
Instruction & Maintenance Manual
Jabiru 3300 Aircraft Engine
Hydraulic Valve Lifter Models
Position dial indicator onto crank as shown above and eliminate main bearing clearance by
bearing down on crank when rotating. Rotate crankshaft to measure crankshaft run out,
normally expect to see 0.01 - 0.03 mm, but if run out exceeds of 0.08 mm the crankshaft
must be replaced.
Position dial indicator onto prop flange as shown above, eliminate end float by either pulling
or pushing flange when rotating. Rotate prop flange to measure the face run out, normally
expect to see 0.02 - 0.06 mm, but if run out exceeds 0.08 mm then replace the prop flange.
Note:
- If the crankshaft run-out exceeds the above limit the engine has to be stripped and the
crankshaft replaced.
- The flywheel retaining cap screws (6) need to be replaced after any prop strike.
Even if the above run out requirements are met and depending on the severity of the prop strike, it
could be prudent that an engine strip be performed and the crankshaft MPI tested, as internal
damage may have occurred and can only be revealed by stripping the engine.
The decision to run an engine after a prop strike and after carrying out the above run out checks,
rests with the owner. If you have any doubt about the action to take, then consult the Jabiru factory
or your Authorised Jabiru dealer for advice.
Engines running a non-Jabiru propeller (especially composite propellers), must check the tension
of the 6 flywheel cap screws at each service to determine that the cap screws meet the torque
requirement, if not, then replace the cap screws and apply Loctite to the screws on assembly.
If an engine stoppage due to force is not recorded in the logbook and
not advised to Jabiru, the liability for all subsequent and consequential
damage will remain with the owner.
This applies to both prior to and after engine overhaul. If a crankshaft has been severely stressed
but measurements and MPI testing indicate a sound item it is Jabiru policy to not re-use, but
replace with a new crankshaft.
This document is controlled while it remains on the Jabiru server. Once this no longer applies the document becomes uncontrolled.
REVISION 0 1 2 3 4 5 6 7 8 9 Dated : Apr 2011 Issued By: DPS Page: 37 of 53
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