Vac lines - help please

Just to be on the safe side, I’m considering upgrading all my vac lines - they look like the originals, and whilst I don’t think any have worn through, I don’t actually know what condition they might be in.
Looks straight forward enough, but here are the questions;

How do I identify all of them?
What is the best line to replace it with (size / temp rating etc.)

I’ll also be doing the main air pipes - is there a kit for these that doesn’t come in blue or orange?

TIA

https://cat.lrparts.ru/images/diags/12/1233_014729120.jpg

https://cat.lrparts.ru/images/diags/12/1233_014730864.jpg

Freddie17 said:

How do I identify all of them?

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follow the line that comes from the vac. pump,
which is .. standing in front of the engine .. on top right of engine,
driven by the camshaft.
main hose .. with non return valve .. goes to the brakes servo .

other hoses that branch off the main .. will go to :
vac reservoir > turbo solenoid
egr solenoid
...
4mm i.d. silicon hoses work well
..
careful removing the old one from the turbo vac. reservoir ..
as the spigot can break .. epoxy glue be a fix .. if it does break.
.

Freddie17 said:

I’ll also be doing the main air pipes - is there a kit for these that doesn’t come in blue or orange?

Click to expand...

http://derbyperformancehose.co.uk/trade-silicone-hose.html

https://www.muddymods.com/collections/freelander-1/Freelander-1

https://www.autosiliconehoses.com

..

hd3 said:

follow the line that comes from the vac. pump,
which is .. standing in front of the engine .. on top right of engine,
driven by the camshaft.
main hose .. with non return valve .. goes to the brakes servo .

other hoses that branch off the main .. will go to :
vac reservoir > turbo solenoid
egr solenoid
...
4mm i.d. silicon hoses work well
..
careful removing the old one from the turbo vac. reservoir ..
as the spigot can break .. epoxy glue be a fix .. if it does break.
.

Click to expand...

4mm silicon hoses… what internal diameter are these? 3mm?

Freddie17 said:

4mm silicon hoses… what internal diameter are these? 3mm?

Click to expand...

4mm
sites usually state i.d. ..
....
i measured a silicon vac hose here ... i.d. measurement ..
before posting in this thread.

hd3 said:

4mm
sites usually state i.d. ..
....
i measured a silicon vac hose here ... i.d. measurement ..
before posting in this thread.

Click to expand...

Brill - thanks, that’s what I was not sure about.
I’ll order up 4mm

Duh - I just re-read your first post - you told me 4mm id then!

Freddie17 said:

I just re-read your first post - you told me 4mm id then!

Click to expand...

no worries .. easy to miss things sometimes ..
.

hd3 said:

no worries .. easy to miss things sometimes ..
.

Click to expand...

I was wondering is there no difference in vacuum produced, when the diameter is being changed on the hoses? The original seem to be 3.2mm and other 3.5mm or? At least that's what I found somewhere on a BMW site for the TD4.

mbrokof said:

I was wondering is there no difference in vacuum produced, when the diameter is being changed on the hoses? The original seem to be 3.2mm and other 3.5mm or? At least that's what I found somewhere on a BMW site for the TD4.

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Well the 4mm id that I just got fits fine - never measured the original that closely. I just went with the advice on this site!
I would imagine that any difference produced between 3.5 and 4mm would be minuscule- but I’m no scientist!

The size of the internal diameter is irrelevant as far as the vacuum is concerned.
However the lines must fit snugly, or they'll potentially loose vacuum at the joints. BMW use 3.2mm ID pipe, which is very hard to find aftermarket. I've used 3.5mm which is fine, although that's not easy to get either.

i've had no issue with 4mm i.d. [secondary] hoses in mine.
i think the potential squashability of the vac hoses walls, is an important point.
hence i prefer the silicon ones, as opposed to cheaper non-braided rubber types.
..

Nodge68 said:

The size of the internal diameter is irrelevant as far as the vacuum is concerned.
However the lines must fit snugly, or they'll potentially loose vacuum at the joints. BMW use 3.2mm ID pipe, which is very hard to find aftermarket. I've used 3.5mm which is fine, although that's not easy to get either.

Click to expand...

Thanks Nodge68, https://www.ebay.co.uk/itm/25502705...6Ile0Nvt4juhG3Y9RQp7xo6y/Q==|tkp:BFBMkLn0_-Rh would those be ok, becaue those could be got as 3.2mm and 3.5mm or those https://www.ebay.co.uk/itm/40301168...qX/x73ihjvvpcX+5MDhUOev6Sg==|tkp:BFBMkLn0_-Rh