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Vacuum hose to banjo bolt broke, where and what does it do?

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
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abscate
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Re: Vacuum hose to banjo bolt broke, where and what does it do?

Post by abscate » Mon Dec 09, 2019 9:28 am

cn90 wrote:
Mon Dec 02, 2019 5:18 pm
To revisit this issue of the Black Hose. Sure I can buy the T6 kit ($40) as June posted above and use only the black plastic hose, which is a waste of money for something like this...

I need someone to help me with actual measurement of the hose itself (not the barb fitting).
- I.D. = ___?; O.D. = ___?
- I see white plastic hose sold at Ace Hardware, the stuff used for fridge water line, for about $0.50/foot.
Is this hose (used for fridge water supply) a good idea?
- How about regular rubber hose (which I have at home), can it handle vacuum under boost without collapsing inward?
That line will be under pressure when boost is on, and under vacuum when the car is on overrun - just like the Purge system, Volvo designed a way to clear the PCV box under both conditions

I think it needs to be pretty rigid to perform that function, as long as you secure both ends well, though, a number of fairly thick wall hoses should work as long as they are oil resistant.
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Re: Vacuum hose to banjo bolt broke, where and what does it do?

Post by cn90 » Sat Dec 14, 2019 8:25 am

I am just curious, if the factory design is the "crankcase pressure is on when boost is on", then it will blow out the seals?
No? Just an engineering question...
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abscate
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Re: Vacuum hose to banjo bolt broke, where and what does it do?

Post by abscate » Tue Dec 24, 2019 4:31 am

If I can get to my old parts bin in the shed this holiday I might have this part still.

This is a tough application as this hose sees both vacuum and boost during operation, so cheap flexible hose won’t work. Fridge feeder hose might work if you bond it to the fittings.

At $25 bucks an hour self-rate, though, that $40 kit looks attractive. It’s not a $400 bmw part

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Re: Vacuum hose to banjo bolt broke, where and what does it do?

Post by June » Tue Dec 24, 2019 6:17 am

cn90 wrote:
Mon Dec 02, 2019 5:18 pm
To revisit this issue of the Black Hose. Sure I can buy the T6 kit ($40) as June posted above and use only the black plastic hose, which is a waste of money for something like this...

I need someone to help me with actual measurement of the hose itself (not the barb fitting).
- I.D. = ___?; O.D. = ___?
- I see white plastic hose sold at Ace Hardware, the stuff used for fridge water line, for about $0.50/foot.
Is this hose (used for fridge water supply) a good idea?
- How about regular rubber hose (which I have at home), can it handle vacuum under boost without collapsing inward?
If you get something from the hardware store to work, take lots of pictures and exact measurements and if course post them here! Volvo does ask a premium for their parts. Shortly after replacing the PCV that started this thread, the rear main seal started leaking anyway.

I picked the car up yesterday and one more of the hose assemblies under the intake manifold was replaced due to cracked hose causing a purge valve code and a vacuum leak. I still have the weird metal line with the coolant and vacuum lines waiting to cause issue... :o June
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