Jabiru 3300 - Preparing The Crankshaft For Propeller Flange Refit

Introduction ...

This page contains photos of a Jabiru 3300A Solid Lifter engine under going a bulk strip and rebuild. This page documents the process of preparing the crankshaft for propeller flange refit.



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The first most important job is to run a pin pick rhrough ALL the threads to remove any Loctite 620 that was used to lock the propeller flange bolts to the crankshaft previously. Depending on the amount of Loctite that was previously used there may well be lumps of hardened Loctite left in the threaded grooves. Remove all traces of Loctite ...

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Then, using plenty of cutting oil run a thread tap through the threads. This must be done carefully. The object of the excercise is to ensure that the threads are clear of Loctite NOT to cut a fresh thread. Proceed slowly. If you find that the thread tap is removing metal material from the crankshaft you are damaging the existing crankshaft thread. Stop! The only material that should be coming off on the thread tap is powdery Loctite ...

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When you are satisfied you have removed all hardened Loctite use compressed air to remove any powder or debris. Then thoroughly clean all the cutting oil from the crankshaft threads. Failure to do this properly will means that the next application of Loctite to the propeller flange bolts will not cure/bond properly ...

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With your fresh set of propeller flange bolts you must now drill a hole through the heads of all of them to acomodate the safety wire ...

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