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  #1  
Old 5th April 2016, 11:46 PM
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Default Diff breathers

I spoke to Subaru Aust today and they said

"Hey Les, the diffs do have breathers, which are located at the top of the diff housing, therefore won't be much higher than the diff itself.

It's not recommended to drive through water deeper than the lowest part of the suspension/lowest point of the wheel rim."

So does anybody know the exact height of the breather or is just a plug which can be extended.

Not that I want to go deep in water, but would like to know that if I should enter some water that may end up at sill depth or deeper because a wheel has dropped into a hole that I didn't know about that no water will be drawn into the diff.
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Old 6th April 2016, 02:09 AM
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The hotter the diff, and the colder the water the greater the chance the air in the diff will "shrink" and draw in from outside of the diff, unless you've done a heap of driving and plunge straight into an icy cold river it is unlikely it will pull in any decent amount of water that will cause damage IMO
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Old 6th April 2016, 02:19 AM
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Thanks but I know that, thats why I was asking the question about how high it is and how the diff breather can be raised in a MY15
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Old 6th April 2016, 02:59 AM
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'how high is it' ? - near the top of your diff & gearbox.

'how high do I want it'? - how long is a piece of string? As high as your air intake is probably ok.

http://www.offroadsubarus.com/showth...hp?t=40&page=6
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Old 6th April 2016, 03:28 AM
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Thanks for the link Duncan, I had already read that. The reason I posted because there were non there relating to the 14+ models and was wondering if there was anything different for the newer models.

So thats fine I'll go and see scorpion at capalaba and see what they can do for me.
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Old 6th April 2016, 03:48 AM
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I don't know for sure, but I don't see why there'd be anything different with the way Subaru approached their gearbox/diff venting in recent models vs. the way they (and most manufacturers) have done it since year zero.

The vents are as high as practicable on the gearbox and diff.

How high you want it depends on how deep you want to go

Note that subaru's warning about depth not exceeding the lower portion of the rim is probably to do with wheel bearings and exposed greased joints more than breathers.

"lowest point of the wheel rim" is only 135mm assuming 225/60 tyres !
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Old 6th April 2016, 05:54 AM
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My point was that stock breather location is fine, and going through a river that's deeper than the breather would still be fine as it is not likely to rush into it due to the nature of the stock breathers, I would go through water well over the diffs in my 4wd on stock breathers with no water ingression
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Old 6th April 2016, 05:01 PM
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I'd extend them; I have on both cars. I certainly know of Subies and "proper" 4WDs that have taken in water in their diffs with stock breathers. Of course live axle 4WDs are more at risk as there are more places where water could be drawn past seals when things are hot.
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Old 6th April 2016, 07:23 PM
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Thanks everyone for your input, appreciated

In the past in "proper 4WD" I have only been in creeks up to the top of the wheels i.e. Patrol and Pajero and with this "car" I wont be going that deep probably only to the sill.

But I need to be prepared and informed of what I can and can't do.
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Old 7th April 2016, 09:44 AM
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Also be prepared for the sudden drop into a unforeseen hole.
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