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PostPosted: Mon Mar 05, 2018 4:56 pm 
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Saab Nut

Joined: Thu May 24, 2012 8:12 pm
Posts: 1731
Location: Blandford Forum
Car Model: All of them.
Have noticed some of my under bonnet hoses are getting perished. Nothing caused any problems as yet but I'd like to catch them before they do. I want to use silicon for long term effects.

What diameters and lengths do I need to replace them all please ? Initially it's the ones I have to buy in lengths that I'm doing.

_________________
'99 9-5 2.3 SE lpt manual saloon.
'95 BMW 320 auto touring.


Last edited by ocallen on Mon Mar 12, 2018 10:15 pm, edited 1 time in total.

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PostPosted: Tue Mar 06, 2018 8:46 am 
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Saab Nut

Joined: Thu May 24, 2012 8:12 pm
Posts: 1731
Location: Blandford Forum
Car Model: All of them.
Likewise am I best off by buying from our regular Saab suppliers ?

_________________
'99 9-5 2.3 SE lpt manual saloon.
'95 BMW 320 auto touring.


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PostPosted: Tue Mar 06, 2018 1:03 pm 
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UKS Addict

Joined: Sun Jan 26, 2014 9:41 am
Posts: 2551
Location: Royal Tunbridge Wells
Car Model: '03 9-5 2.3 Vector Auto Estate
Do you mean the small diameter vac hoses, they are the ones which normally deteriorate. 3 or 4mm silicon is fine (blue or red for extra power). 3mm is tight to get on, 4mm can come off and need a cable tie to fix (original was 3.5mm). I have never had a problem with 4mm. You can get it from BillJ's site (Saabits) with UKS discount if you look at one of his posts.

EDIT: Should have added 2m should be enough. Just do it one pipe at a time and its easy.

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Alan

'03 Saab 9-5 Vector 2.3t Auto Noob Stg 1
'01 Saab 9-3 2.0t SE Convertible
'81 Triumph TR7 DHC


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PostPosted: Tue Mar 06, 2018 3:57 pm 
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Saab Nut

Joined: Thu May 24, 2012 8:12 pm
Posts: 1731
Location: Blandford Forum
Car Model: All of them.
Thanks for the advice. Ordered from Saabits and used our discount code.

Being delivered on Friday.

_________________
'99 9-5 2.3 SE lpt manual saloon.
'95 BMW 320 auto touring.


Last edited by ocallen on Mon Mar 12, 2018 10:17 pm, edited 1 time in total.

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PostPosted: Mon Mar 12, 2018 10:14 pm 
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Saab Nut

Joined: Thu May 24, 2012 8:12 pm
Posts: 1731
Location: Blandford Forum
Car Model: All of them.
Today fitted the 3mm blue hoses that Saabits sent to me but now want to fit others. On eBay I see that 9-3 turbo models have more hoses in their kits than 9-5 models. Samco, for example, only seem to offer three coolant hoses for the 9-5. PFS and Neos offer kits for the 9-5 with four hoses.

So is it only coolant hoses available for the 9-5?

Can I get a universal silicone hose that can be used as a sleeve to put over electrical or other "under bonnet" fittings ?

I'd like to replace as many hoses as possible with blue silicone.

_________________
'99 9-5 2.3 SE lpt manual saloon.
'95 BMW 320 auto touring.


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PostPosted: Tue Mar 13, 2018 7:58 pm 
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Saab Nut

Joined: Thu May 24, 2012 8:12 pm
Posts: 1731
Location: Blandford Forum
Car Model: All of them.
Are silicone used for fuel and oil ?

_________________
'99 9-5 2.3 SE lpt manual saloon.
'95 BMW 320 auto touring.


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PostPosted: Tue Mar 13, 2018 8:33 pm 
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Saab Nut

Joined: Thu May 24, 2012 8:12 pm
Posts: 1731
Location: Blandford Forum
Car Model: All of them.
I think that I've answered some of my own questions. I've spent a good part of today trying to source these. PFS can do a DO88 kit for many parts and their prices seem very good.

_________________
'99 9-5 2.3 SE lpt manual saloon.
'95 BMW 320 auto touring.


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PostPosted: Tue Mar 13, 2018 10:22 pm 
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UKS Addict

Joined: Sun Jan 26, 2014 9:41 am
Posts: 2551
Location: Royal Tunbridge Wells
Car Model: '03 9-5 2.3 Vector Auto Estate
Silicon is not good for oil and I would guess also fuel. If it is used, for instance, on the vent line from the cam cover which carries oil vapour you will find it turns dark and sweats oil.

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Alan

'03 Saab 9-5 Vector 2.3t Auto Noob Stg 1
'01 Saab 9-3 2.0t SE Convertible
'81 Triumph TR7 DHC


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PostPosted: Wed Mar 14, 2018 10:36 am 
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Active user

Joined: Tue Jul 14, 2015 3:27 pm
Posts: 200
Location: London
Car Model: 9-5 Saloon MY98 2.0LPT
ocallen wrote:
Are silicone used for fuel and oil ?

No, it needs to be the much more expensive FluroSilicone. You usually find its just the inner layer (in contact with fuel/oil) made with this and outer layers with standard silicone rubber. I have never seen small diameter Flurosilicone that could be used on EVAP or PCV. Probably best to stick with standard fuel safe rubber for these.
The change of colour is cosmetic as far as the tubes are concerned but indicates a bigger problem. Silicone is being leeched out by solvents (petrol and oil). That is then converted to silicon to silicate by combustion and trace amounts of that poison Lambda sensors. Remember the great fuel contamination from 2007 when lots of cars were busted? That was more severe silicone contamination and is obvious when the engine won’t run, but tiny amounts will affect the sensor(s) and give incorrect readings. In months or years to come you could be scratching your head wondering why your fuel consumption is not as good as it used to be.


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