Holding axle pressure blocked breather hole

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philynnbob
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Holding axle pressure blocked breather hole

Post by philynnbob » Tue Apr 10, 2018 1:15 pm

Thought I would share this as to me this was quite interesting :D
Cleaning the filthy axle removed from a 5a which has been off the road for several years.
Found the axle breathers hole completely blocked. Upon prodding the hole open quite a long hiss of air under pressure escaped.
I would have presumed that any pressure would have long escaped past the seals.



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philhoward
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Holding axle pressure blocked breather hole

Post by philhoward » Tue Apr 10, 2018 1:24 pm

:shock:


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Roger Pennington
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Holding axle pressure blocked breather hole

Post by Roger Pennington » Tue Apr 10, 2018 1:44 pm

That's odd? I thought any positive pressure was the result of heat, and that it drew in air again as it cooled? Maybe it's gas produced by degeneration of the oil with age?


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peter freeman
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Holding axle pressure blocked breather hole

Post by peter freeman » Tue Apr 10, 2018 1:48 pm

The seal shape would allow in to the axle when the axle was cold ( it has been cold ) and the pressure in the axle -ve. As the axle warmed the pressure would be +ve inside and the shape of the seal would stop the air getting out. Well that's my best theory - anyone got a better idea.



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Holding axle pressure blocked breather hole

Post by philynnbob » Tue Apr 10, 2018 2:07 pm

Perhaps should have said that previous pressure problem on axle evident from the amount of old grease ( now very crusty) pushed through in to hubs! So old grease also sealing hub ends.



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David Tew
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Holding axle pressure blocked breather hole

Post by David Tew » Tue Apr 10, 2018 2:12 pm

Perhaps you've discovered a new source of natural gas. Soon we'll all be plumbed into your axle! :)
On a more serious note, at least the positive pressure stopped any moisture getting in.


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