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geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4392

Can Silicone Hoses become Porous?

I have had a set of silicone hoses installed on the TD5 for 6 or 7 years and over the last 12 months or so I have noticed that they seem to be oozing oily residue; see photos below...

Click image to enlarge

Click image to enlarge

There is no other evidence of oil leaking from any other component and the jubilee clips are good and tight. Wondering if the inner layer of the hose has worn allowing oily residue to push out of the threads. Odd...!

Anyone else had this issue?

17th Oct 2018 7:57am

barbel jim

Member Since: 12 Dec 2012
Location: Northants
Posts: 1411

I'd have thought it'll be oils/road grime found in the stagnated air under the bonnet which would stick and be more noticeable on silicon hoses due to there natural shine. Unless you've noticed big a change in performance ??

17th Oct 2018 9:06am

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4392

No apparent change in performance. Just weird is all...

I can see an investigative removal of the hoses to check they are A-OK coming up.

17th Oct 2018 10:28am

barbel jim

Member Since: 12 Dec 2012
Location: Northants
Posts: 1411

Definitely think it'll just be a collection of general road film ! I'd just clean them off and watch it gather again

17th Oct 2018 10:59am

L110CDL

Member Since: 31 Oct 2015
Location: Devon
Posts: 10476

Don't know about the outside of the hoses but one of mine de-laminated from the inside

so i put an oem one back on at the moment

1996 Golf Blue 300Tdi 110 Pick up. Keeper.

Clayton.

17th Oct 2018 8:15pm

LR90XS2011

Member Since: 05 Apr 2011
Location: bickenhill
Posts: 3612

2011 Defender 90 Puma 2.4 XS CSW Galway Green

silicone hoses will degrade in the presence of oil or fuel hence unless lined are unsuitable for situations where these are present.

I work for a maintainer with over 200 diesel engines we were sold on Silicone some 10 years plus ago and later regretted it as many of them failed. We tested some silicone coolant hoses after a couple of years use by pressurising them with air and they foamed with lots of pin holes.

Most hoses were then replaced with nitrile rubber.

Silicone has moved on since then but once bitten! ,

My personal view on a race car or regular maintenance vehicle silicon looks lovely and may have some short term benefits, on a fit and forget basis its a different matter. Another dis benefit of silicone is that where it is fixed to the pipe work it is more likely to leak as it is less cohesive than rubber DEFENDER 90 TDCI XS,

I hope everyone is well and your land rovers make you happy

17th Oct 2018 8:35pm

leeds

Member Since: 28 Dec 2009
Location: West Yorkshire
Posts: 8578

Had a discussion with a silicone hose maker some time back. Now I can not remember the full details but apparently the cheaper silicone hoses have more inert filler in, are thinner and have less layers.

So would expect the cheaper silicone hoses to have a lower working temperature and lower burst pressures.

Brendan

17th Oct 2018 9:16pm

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