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Diff breathers

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klarie

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Ah I see .. ve seen similar 2way valves on gearboxes and engine. I am not a mechanical engineer. So what I gonna do - ask my car mechanic. Need to talk to the guy anyway. My front camera became dysfunctional during snowfall on Saturday ..
 
DCPU

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DaveB said:
This is what a diff breather kit looks like
Totally different to a non-return valve based breather
They are two way and allow the diff to breath out and back in from a controlled location.

View attachment 7796483
Click to expand...
Never really understood that design ~ go to all that effort and terminate under the bonnet with no shield or cover. Drop into a hole whilst wading and...

Much prefer this arrangement:
land-rover-defender-200tdi-300tdi-wading-kit-gwyn-lewis-4x4-04.jpg


Of course any manifold introduceds a single point of failure, early Camel Trophy vehicles used to route all the separate breathers up the snorkel. Looked a little messy but where function is the absolute design criteria perhaps better.
 
emax

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DaveB said:
This is what a diff breather kit looks like
Totally different to a non-return valve based breather
They are two way and allow the diff to breath out and back in from a controlled location.

View attachment 7796483
Click to expand...

That's what I'd expect. It's independent from having a snorkel or not, since wading always causes air in the diffs to expand or shrink. Even if I drive through only 30cm of water.

There is a wading limit for each car. So the breathers have to be mounted above that limit. I personally would avoid to have another gasket in a snorkel.
 
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DaveB

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DCPU said:
Never really understood that design ~ go to all that effort and terminate under the bonnet with no shield or cover. Drop into a hole whilst wading and...

Much prefer this arrangement:
View attachment 7796493

Of course any manifold introduceds a single point of failure, early Camel Trophy vehicles used to route all the separate breathers up the snorkel. Looked a little messy but where function is the absolute design criteria perhaps better.
Click to expand...
I didn't design it, only posted it.
 
DaveB

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bnebenda said:
I'd say engineers from Magna Steyr have some (limited :)) experience building proper 4 wheelers as they were involved in others similar cars before (like e.g. the G-wagon). Admittedly they are not german but austrian, though
Click to expand...
Exactly my tongue in cheek comment
If I had to build a real 4Wd
and I was a billionaire
I would definitely invite them to the pub for a beer
 
DenisM

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DaveB said:
Ric said this morning that the diffs are sealed and don't have breathers
Click to expand...
I recall my RRP38 had 4 breather tubes that terminated at a common point in the engine bay..
Like others I am quite surprised that breathers appear to be missing from the IG axles, transmission and transfer case... I await with interest, the final configuration to see how the seal pressure gradients are solved.
 
ECrider

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Same here DenisM. 'One-Way' valve, if the case seems unusual.
 
bemax

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ECrider said:
Same here DenisM. 'One-Way' valve, if the case seems unusual.
Click to expand...
A one way valve is pointless if there is not a second one way valve in with an opposite direction of flow somewhere.
If it gets hot the air will go out. If it gets cold the air has to go in.
A one way valve would mean air goes out in warm conditions and under cold conditions there is just an underpressure…
🤔
 
Jean Mercier

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bemax said:
A one way valve is pointless if there is not a second one way valve in with an opposite direction of flow somewhere.
If it gets hot the air will go out. If it gets cold the air has to go in.
A one way valve would mean air goes out in warm conditions and under cold conditions there is just an underpressure…
🤔
Click to expand...
I heard for the first time in my life about these valves here, so am a complete novice. I am just wondering ... valves are never completely 100% tight, perfection only exists on paper. What if overpressure is dramatic, and underpressure isn't, and the "slow underpessure leaks" are sufficient to bring slowly everything back to normal?
Just thinking ... perhaps a stupid argument (but please don't call me stupid, only my argument ;) )
 
rovie

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bemax said:
A one way valve is pointless if there is not a second one way valve in with an opposite direction of flow somewhere.
If it gets hot the air will go out. If it gets cold the air has to go in.
A one way valve would mean air goes out in warm conditions and under cold conditions there is just an underpressure…
🤔
Click to expand...
Let's assume that those who build the axles know what they are doing.
 
Tazzieman

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rovie said:
Let's assume that those who build the axles know what they are doing.
Click to expand...
As my father says , that's a way to make an ass out of u and me.
Irrelevant I know but you will never look at that word the same way again!
 
rovie

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Tazzieman said:
As my father says , that's a way to make an ass out of u and me.
Irrelevant I know but you will never look at that word the same way again!
Click to expand...
:unsure:
 
bemax

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rovie said:
Let's assume that those who build the axles know what they are doing.
Click to expand...
they will know for sure. But there’s still no explanation for for me how it should work only with one way valves…
 
DCPU

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bemax said:
A one way valve is pointless if there is not a second one way valve in with an opposite direction of flow somewhere.
If it gets hot the air will go out. If it gets cold the air has to go in.
A one way valve would mean air goes out in warm conditions and under cold conditions there is just an underpressure…
🤔
Click to expand...
It may seem pointless but it's the standard setup in a number of well engineered vehicles.

Axle ends aren't gas tight; and pulling air in is not really an issue. The issue is blowing oil out. Look at the design of the seal lips and how they work more in one direction than the other.
 
bemax

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DCPU said:
It may seem pointless but it's the standard setup in a number of well engineered vehicles.

Axle ends aren't gas tight; and pulling air in is not really an issue. The issue is blowing oil out. Look at the design of the seal lips and how they work more in one direction than the other.
Click to expand...
So you assume that the construction itself works as the inlet valve?
 
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