Jabiru 3300 - Removal of Propeller Flange

Introduction ...

This page contains photos of a Jabiru 3300A Solid Lifter engine. This page documents the removal of the propeller flange fromt the crankshaft. This is necessary if you wish to replace the crankshaft oil seal.



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Image 1

So here have the propeller flange still bolted to the PTO end of the cranksahft. You can see that there are six allen head cap bolts with washers safe-wired. Note that there is considerable varnish / oil etc on the face of the propeller flange. This will need to be cleaned off before the propeller is replaced ...

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Image 3

Note the crankshaft is supported in a heavily padded vice and there is no contact between the conrods / big end bearings and the vice ...

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Image 4

Place an uncontaminated rag over the big end bearings closest to the flange so that when the propeller flange face is removed none of the FOD finds it's way into the big end bearings ... View Larger Image ...


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Image 5

Remove all safe-wire ...

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Image 6

Next remove the flange bolts (and washers) and the propeller flange should with a little tap from a rubber mallet part company from the crankshaft ...

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Image 7

And here it is on the bench ...

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Image 8

You can see that some cleaning is necessary before this part can be returned to service ...

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Image 9

Just looking at the removed flange bolts it is possible to see that an excessive amount of Loctite 620 was used when these bolts were last fitted ...

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Image 10

It is now possible to remove the front oil seal and it's housing from the crankshaft by sliding it off. It is always good practice to replace this seal if you remove it ...

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Image 11

A view of the end of the crankshaft once the oil seal housing has been removed. This will require some cleaning up to get a replacement oil seal back on the crankshaft without damaging the internal sealing surface of the oil seal. Also the residual Loctite 620 will need to be removed very carefully from the threads in the end of the crankshaft with a sharp pick or similar implement. It is very important that no residue is left before the flange is refitted otherwise the join between flange and crankshaft will be unreliable ...

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Image 12

Some alternative views of the end of the crankshaft ...

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Image 16

Here is the front oil seal and oil seal housing on the bench ...

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Image 17

Note that there effectively two seals in one here. There is an outward facing dust seal (to prevent the ingress of dust) and the inwards facing oil seal. Here we are looking at the outwards facing face of the oil seal housing ...

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Image 18

Place the propeller flange in a padded vice and thouroughly remove all residue from it's propeller mating face and the crankshaft mating face. It is essential that both surfaces are absolutley clean before re-assembly ...

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