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RoadForce



Member Since: 17 Jul 2014
Location: Holland
Posts: 324
Netherlands 2000 Defender 130 Td5 HCPU Coniston Green
Hissing when jacking up under axle, problem?
So I was doing some repairs and had axle stands under my front axle. When done, I wanted to drop the car down and decided to jack the vehicle up slightly to remove the stands. However, I jacked it up under the axle instead of the dif, thinking I would be ok. But I quickly heard a hissing sound, like air escaping the axle (or being sucked in). I quickly dropped it back onto the stand and then moved the jack to the dif.

Now, I wonder what the hissing sound was (the axle has a breather pipe, so I imagine there should not be a difference in air pressure inside/outside the axle) and more importantly: should I be worried? Defender 130 HCPU Td5 MY2000
Post #597772 30th Jan 2017 9:30pm
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LR90XS2011



Member Since: 05 Apr 2011
Location: bickenhill
Posts: 3613
United Kingdom 2011 Defender 90 Puma 2.4 XS CSW Galway Green
nothing there that should cause that, wouldn't worry at all, you sure it wasn't the jack? DEFENDER 90 TDCI XS,

I hope everyone is well and your land rovers make you happy
Post #597783 30th Jan 2017 9:40pm
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RoadForce



Member Since: 17 Jul 2014
Location: Holland
Posts: 324
Netherlands 2000 Defender 130 Td5 HCPU Coniston Green
No I am sure it was air coming from/going into the axle Question Defender 130 HCPU Td5 MY2000
Post #597811 30th Jan 2017 10:15pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
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Did the jacking cause the axle to significantly lower on OE side and lift the other?
If so, it might just be the axle oil moving about.

That may draw air down the breather, it'll escape again anyway if it did.

I really wouldn't worry, otherwise it maybe the jack its self. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧
Post #597862 30th Jan 2017 11:05pm
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RoadForce



Member Since: 17 Jul 2014
Location: Holland
Posts: 324
Netherlands 2000 Defender 130 Td5 HCPU Coniston Green
Hmm, it didn't stay perfectly horizontal no, so I suppose oil may have moved from side to side. Perhaps this caused air to be sucked in or expelled, although I wouldn't call the "un-horizontal-ness" ( Laughing ) to have been significant.

I am wondering if this indicates an issue with the breathing system of the axle, and how can I test it works properly? Defender 130 HCPU Td5 MY2000
Post #597943 31st Jan 2017 8:54am
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Laurie



Member Since: 22 Feb 2008
Location: Sussex, England
Posts: 2897
England 2005 Defender 90 Td5 XS CSW Bonatti Grey
A hydraulic leak in the jack. 
Post #597981 31st Jan 2017 11:26am
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19566
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RoadForce wrote:
Hmm, it didn't stay perfectly horizontal no, so I suppose oil may have moved from side to side. Perhaps this caused air to be sucked in or expelled, although I wouldn't call the "un-horizontal-ness" ( Laughing ) to have been significant.

I am wondering if this indicates an issue with the breathing system of the axle, and how can I test it works properly?


Un-clip it axle end, and blow compressed air through it, they come up in the engine bay next to the block.
Or they do on a Puma at least.
They have a curved bent over top, think walking stick / candy cane shape. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧
Post #597989 31st Jan 2017 11:48am
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RoadForce



Member Since: 17 Jul 2014
Location: Holland
Posts: 324
Netherlands 2000 Defender 130 Td5 HCPU Coniston Green
Thanks, I am not so worried the breather pipe itself is blocked (I know what it looks like, I cut through it with my angle grinder whilst replacing the bulkhead outrigger Whistle ) but was wondering if the "internal breather thingies" inside the axle may have become clogged in any way. Don't know if that is even possible, just wondering.

(And to all saying the sound came from the jack: thanks for trying to help, but it was not the jack, I am 100% sure) Defender 130 HCPU Td5 MY2000
Post #597999 31st Jan 2017 12:53pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
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United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
There is nothing in or on the axle which would make a hissing noise. You will not cause air to be drawn in nor expelled by jacing the axle at an angle (it is open to atmosphere and there is a free air surface above the oil).

It is not totally impossible that one or other of the dampers might hiss if compressed or extended, or you have dislodged an air pocket in the cooling system.

I very much doubt that the noise came from the axle, and I think that you are worrying too much!

Oh, and there are no "internal breather thingies" in the axle!

Last edited by blackwolf on 31st Jan 2017 3:51pm. Edited 1 time in total
Post #598005 31st Jan 2017 1:11pm
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RoadForce



Member Since: 17 Jul 2014
Location: Holland
Posts: 324
Netherlands 2000 Defender 130 Td5 HCPU Coniston Green
No, it is not so much that I was really worried, more that I was curious. And given that I haven't driven the car since, I wanted to know if there was anything I could/should do to prevent a disaster/expensive invoices if I started to drive it.

Ok thanks all, I can sleep again tonight haha Thumbs Up Defender 130 HCPU Td5 MY2000
Post #598006 31st Jan 2017 1:18pm
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JWL



Member Since: 26 Oct 2011
Location: Hereford
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England 2002 Defender 110 Td5 SW Coniston Green
Just a thought, it might have been the shock absorbers settling into position.
Post #598021 31st Jan 2017 2:26pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
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^^^^ They can make a hydraulic hissing sound, that is true. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧
Post #598022 31st Jan 2017 2:28pm
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RoadForce



Member Since: 17 Jul 2014
Location: Holland
Posts: 324
Netherlands 2000 Defender 130 Td5 HCPU Coniston Green
I didn't think of that, perhaps you're right. Anyway, I have given this subject a rest (mentally...), thanks to all of you I am no longer concerned it is a problem. Thumbs Up Defender 130 HCPU Td5 MY2000
Post #598206 1st Feb 2017 8:33am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
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United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
^^^ Just like I said several posts above ! Thumbs Up



blackwolf wrote:
...

It is not totally impossible that one or other of the dampers might hiss if compressed or extended

...
Post #598212 1st Feb 2017 10:00am
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RoadForce



Member Since: 17 Jul 2014
Location: Holland
Posts: 324
Netherlands 2000 Defender 130 Td5 HCPU Coniston Green
You're right, I missed that Embarassed Defender 130 HCPU Td5 MY2000
Post #598215 1st Feb 2017 10:04am
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