Loose tube needs identifying

[JL Diesel]

Hi all. I was changing my oil today and I noticed this tube was disconnected that goes into the front differential. I reconnected it but I don’t know what it is for. Nothing noticeable has been leaking on the ground and no idea when it might have gotten disconnected. Thanks.

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[Gorilla57]

Front diff breather tube/hose. Good catch, because if you hit a water crossing without it hooked up, you’d get water in your axle.

 

[TX_Ovrlnd]

I believe that is the breather tube.

 

[JL Diesel]

Front diff breather tube/hose. Good catch, because if you hit a water crossing without it hooked up, you’d get water in your axle.

Thanks! That’s good to know!

 

[DaltonGang]

Hi all. I was changing my oil today and I noticed this tube was disconnected that goes into the front differential. I reconnected it but I don’t know what it is for. Nothing noticeable has been leaking on the ground and no idea when it might have gotten disconnected. Thanks.

Maybe I'm not looking at it right, but it looks connected to me.

 

[AZJeepGuy]

Where does it go?

 

[JL Diesel]

Maybe I'm not looking at it right, but it looks connected to me.

I reconnected it. It’s hard to tell where up under the hood it is connected

 

[smokeythecat]

I reconnected it. It’s hard to tell where up under the hood it is connected

If it's a breather hose it shouldn't be connected to anything. It just puts the opening higher so water is less likely to get into it.

 

[00 Trans Ram]

OK, followup question. Why does a diff need a breather tube? Not like it generates any significant amounts of heat or compression.

 

[SmartStopStart.com]

Heat from operation will pressurize the air in the differential. If it is not vented, it can blow the axles seals out or cause fluid to seep from the axle seals.

 

[Gorilla57]

OK, followup question. Why does a diff need a breather tube? Not like it generates any significant amounts of heat or compression.

You need to temp gun your rear diff cover after a long hill, it will amaze you how hot it gets. One of the members on here has a temp probe in his diffs and the temps are way higher than you’d guess. So, that heated air in the diff has to go somewhere.

 

[00 Trans Ram]

Interesting!!

I don't do any rock crawling (SE LA makes a pancake look like the Andes). But, I did plenty of road racing with a live-axled car (2000 Trans Am). Wonder if that works a diff nearly as hard? Probably not. Lots of power going through it, but not a lot of slippage.

 

[JL Diesel]

I followed the tube up and it just connects into the bottom of what appears to be a metal plate under this brake fluid distributor?

It makes sense to be an air release. There is definitely no water finding its way into that tube as long as the bottom tube doesn’t come loose again.

 

[grimmjeeper]

Yep. The cap on it lets air in and out while mostly shielding it to keep water out.

And that brake module is the ABS mechanism.

 

[JL Diesel]

Yep. The cap on it lets air in and out while mostly shielding it to keep water out.

And that brake module is the ABS mechanism.

Ahh the ABS. Makes more sense. Thank you. There is a lot more to learn on this engine than the old 4.0L strait 6 ha. I’ll get there eventually

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