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97 855R PCV 5/8 hose mod, what vacuum hose?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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Peevarino
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97 855R PCV 5/8 hose mod, what vacuum hose?

Post by Peevarino » Wed Nov 06, 2019 4:27 am

After breaking, and putting what equates to a band aid on, the plastic line from the box to the PTC, I figured replacement of the PCV setup is in order. The car has 195k on it, and I’m planning on having it for quite some time, I am going to avoid the plastic pipe and go for the 5/8 hose modification to the system.

My question for those who have done this is, what do y’all use for the vacuum hose between the passenger side of the manifold and the PTC?

Secondary to that question, is it worth it to use any sort of heat shielding over the two hoses where they run between block and intake manifold?


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Chuck W
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Re: 97 855R PCV 5/8 hose mod, what vacuum hose?

Post by Chuck W » Wed Nov 06, 2019 1:03 pm

I just used some 5mm silicone tubing.

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Peevarino
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Re: 97 855R PCV 5/8 hose mod, what vacuum hose?

Post by Peevarino » Wed Nov 06, 2019 4:48 pm

What, if any, elbow did you use connecting to manifold and PTC?


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Re: 97 855R PCV 5/8 hose mod, what vacuum hose?

Post by Chuck W » Wed Nov 06, 2019 6:12 pm

None. I added a clamp on the manifold side, just to keep it in place. I think on the PTC side I just used a zip tie as a clamp (Didn't have any better options that I was happy with).
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erikv11
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Re: 97 855R PCV 5/8 hose mod, what vacuum hose?

Post by erikv11 » Wed Nov 06, 2019 9:59 pm

Silicone is not my first choice for that connection. It works fine but the silicone will get oily and sweat oil. I went with good old rubber for that one only, no elbow as ChuckW says. All other vac lines I use silicone.
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'95 854 T5-R, Motronic 4.4, 185k
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'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
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Re: 97 855R PCV 5/8 hose mod, what vacuum hose?

Post by abscate » Thu Nov 07, 2019 4:47 am

Some foam insulation from Lowe Quality home store would keep that pipe warm and also give some chafe relief


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Re: 97 855R PCV 5/8 hose mod, what vacuum hose?

Post by greg850r » Thu Nov 07, 2019 7:20 pm

I prefer to use bendable copper A/C lines. Seem more durable and easier to fit to me.


05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

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