Half shaft oil seal

[puddlesurfer]

Biohazard, A while ago you had diff breather kits, do you still have them? How much, I could use some

[BioHazard]

Biohazard, A while ago you had diff breather kits, do you still have them? How much, I could use some

yes i still have the stock parts for extending axle breathers, 2 axle fittings pipe and a t .... then you refit one of the old breather tops under the bonnet


You can contact me at www.daemon4x4.org

[puddlesurfer]

If i knew how I would - registering now

[puddlesurfer]

Biohazard I think i just sent you a message - but i'm not sure!

[dieselboy]

so why do i need an extended breather (out of the water)if i want to go under the water with my diff?

mind, ive never had a problem without one

Exactly what I was thinking. I know my diff is not manufactured to be Toyota specific, but it does highlight submerging a diff through water because the water cools the diff and causes air pressure to send water inside.

Thanks for the detailed instructions! That was exactly what I was looking for. I may be able to remove the shaft and jump on a bus to my friends garage.
Will be fun

[dieselboy]

So having read the rest of the thread, if the breather is as you say, a one way valve then does anyone want to work out the volume / pressure difference once travelled down the M1 for example... I just think that it's a poor design that will cause air to be pushed in from wherever possible. The diff would not be completely sealed from the axles? There is moving parts..

I suppose engine oil seals cope quite well though..

Additionally, I went under the surf and touched my breather and all this mud and crud fell out. I'll lube it up and free it propperly on saturday - but I am now quite sure that's why I have a leak.

[puddlesurfer]

mine was blocked and it made the propshaft oil seal leak, free'd it off and it stoped leaking, just ordered some breathers from bio hazard though - stick them under the bonnet and hopefully I wont have any more problems (unless I go really deep next time)

[Apache]

We are so sad we were talking about this in the pub tonight. We reckon they are two way valves. Similar to a hole but not quite. When there is a large enough pressure differential (either way) they open, then when that differential is equalised, they close.

Just like the valves in some of the flight cases we used to air-transport military kit.

Reckon thats it.

[Albannach]

Similar to a hole but not quite. When there is a large enough pressure differential (either way) they open,

So they are designed to open at the worst possible time? The fastest and biggest pressure drop will be when the axle is submerged. If your theory is correct, they will flood the diff with water almost every time the axle is submerged.

[Albannach]

BTW, I'm playing Devil's Advocate here.

There are 2 reasons I don't think they are 2 way valves (by design). Firstly, when I had my new ones, I could easily blow through them, but I couldn't sook. Secondly, for the reason I mentioned above, if they were 2 way valves, they'd operate inwards at the worst possible time.

Should we do the 'plane on a conveyor belt again?

[BUSHWHACKER]

They're not valves, they're just open ports. Big enough to expel air but small enough to keep out crap.
If the diff is regularly submerged in water with the standard breathers, the oil will need changing often.
If you need to drown your diffs at every opertunity, fit long hoses to the breathers and terminate them in the engine bay with filters on the end to keep dusty air out of the diffs.

Sheesh!

where's the slaps forehead smiley?

[biosurf]

They're not valves, they're just open ports. Big enough to expel air but small enough to keep out crap.

But if thats the case why can't I suck through my ones from Roughtrax? It definitely appears that they are one way valves. It would make sense if a large pressure change sucked the valve shut (i.e. quick cooling of the diff) whereas a relatively slow pressure change kept it open allowing equlibrium, but from memory I could not pull any air though them no matter how hard (or not) I sucked*

*Please insert an appropriate scattering of 'ffnarrs' and 'Oooers' in the above where you see fit.

If they are one way then surely if high pressure caused by blocked breathers can force diff oil past a seal that has not failed (i.e. in my recent case) then surely if there is an equivalent low pressure through the breathers being one way then water should equally be able to ingress past the seals if you take the surf swimming with a hot diff?


Granted, I'm going to fit extended breathers again once I have the time as I prefer to be belt and braces.

[dieselboy]

When I get home tonight I'll get under the surf and see if I can suck my breathers. Don't want to feel left out.

Hope you're right otherwise I might get a mouth full of heavy gear oil.

[adpsimpson]

Tuppence worth being added... If they are one way, maybe they are designed to equalise by pulling low volumes of air slowly through the axle seals? That would both make designing those seals easier and explain why a failed breather would lead to a leak, which stops when the breather is fixed.

On mine, the rear breather was broken off and the front one clogged up when I fitted the extended breathers, terminated in a cheap inline fuel filter under the bonnet and behind the panels in the boot. There was some, although not much, water in the rear dif if I remember right.

[blackpoolsparks]

here you go, watch this and learn

http://video.google.com/videoplay?do...7597847260935#