Jabiru 3300 - Replacing The PTO Crankshaft Oil Seal

Introduction ...

This page contains photos of a Jabiru 3300A Solid Lifter engine under going a bulk strip and rebuild. This page documents the replacement of the power take-off end of crankshaft oil seal.



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Image 1

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

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Image 2

Note that there doesn't appear to have been any flange sealant applied between the oil seal and the housing so this seal should just push out of the housing. Apologies - I don't seem to have taken any photos of it being pushed out - to be added at a future date ...

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Image 3

Having thoroughly cleaned and degreased the housing, a very thin layer of Loctite 5910 flange sealant is applied to the outer mating surface of the seal where it joins with the housing. The purpose of the flange sealant is not to provide a better seal between the oil seal and the oil seal housing. It is to prevent the seal from moving or rotating in the housing in use. If the seal moves it will surely fail very soon afterwards. There is only a very small chance that a correctly installed seal should become unseated - this is just belt and braces ...

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Image 4

The housing is supported and placed in the press ...

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Image 5

Here is a new seal with a very conservative application of Loctite 2910 flange sealant applied to it's outside edge ...

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Image 6

Ready to be pressed into the housing ...

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Image 7

Position the press-in plate on top of the seal ...

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Image 8

Use the hydraulic press to press the press-in plate towards the housing driving the seal in ...

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Image 9

Note that the outside diameter of the press-in plate is a few milimetres more than the internal diameter of the seal housing ...

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Image 10

So the press-in plate overhangs the seal and ensures it goes in squarely and flushly without danger of the seal being pushed in too far. Here is the finished result: an oil seal that is flush with the housing ...

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