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P80 bypass ps pump, which belt, which routing

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.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
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Re: P80 bypass ps pump, which belt, which routing

Post by RickHaleParker » Sat Mar 16, 2019 3:07 pm

abscate wrote:
Sat Mar 16, 2019 2:37 pm
You only have alternator load if you keep the AC off. But, I agree, getting a belt on tight enough to drive the alternator without slipping looks like a challenge
Remove the serpentine belt, run a length of string from the crankshaft to alternator. If the string is deflected by the Tensioner, the Tensioner will keep the short belt tight. If not, you would need to determine the length of the short belt with precision.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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Re: P80 bypass ps pump, which belt, which routing

Post by abscate » Sat Mar 16, 2019 3:19 pm

RickHaleParker wrote:
Sat Mar 16, 2019 2:06 pm
1. Disconnect the hoses from the PS pump to the Rack.
2. Shunt a hose from the PS out to the PS return.
3. Top the PS pump off with fluid.
4. Drive the thing home.

If one can get the two hoses off on the rack end then couple the two together that would do the trick.

Rick..next time I’m at a junkyard I will cut off a PS hose and attach and make up this return hose for an emergency. Then you can do the disconnect at the pump and not have to worry about those expensive PS lines

I think that’s the cleanest solution here.
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Re: P80 bypass ps pump, which belt, which routing

Post by RickHaleParker » Sat Mar 16, 2019 3:29 pm

Abscate you only need the Alternator to get home. I'm wondering if you can take one of them Emergency Adjustable V belts wrap it around just the Crankshaft and Alternator. As long as the Alternator keeps the battery up your make it home.

PS: If this would work might just as well add a pair of Pantyhoses to the Emergency Kit. Don't let the other half peek in the kit, it might be a hard sell explaining the reason.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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Re: P80 bypass ps pump, which belt, which routing

Post by dj_v70 » Sat Mar 16, 2019 4:14 pm

How long will p80 run on battery alone?

You could follow with another car and swap batteries back and forth to charge them back up. Maybe.

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Re: P80 bypass ps pump, which belt, which routing

Post by precopster » Sat Mar 16, 2019 4:34 pm

About 30 years ago panty hose twisted and the knot burned together with the cigarette lighter is how we made it about 200kms without an alternator. We ran into two old ladies on their way back from lawn bowls who gladly gave up a pair (not from their legs, though)

When that broke we started tearing up nylon seat covers and doing the same thing. The battery went so flat in 300kms that we made it into a town called Beaufort where a mechanic welded our alternator brackets back together. Car was a 1974 Holden TA Torana with a 1600cc Dodge Colt engine and 5 speed Mitsubishi manual trans (in our market was called a Chrysler Galant)

Once you learn how to burn the knot your home and "hosed" haha
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Re: P80 bypass ps pump, which belt, which routing

Post by RickHaleParker » Sat Mar 16, 2019 4:37 pm

dj_v70 wrote:
Sat Mar 16, 2019 4:14 pm
You could follow with another car and swap batteries back and forth to charge them back up. Maybe.
One could take a page from the Redneck A/C hack. Put a generator in the trunk, use it to power a battery charger instead of a 110V Window A/C. :wink:
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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Re: P80 bypass ps pump, which belt, which routing

Post by SonicAdventure » Sat Mar 16, 2019 7:06 pm

Abscate, thanks for starting this thread. This is a very interesting topic.

Question to everyone: worse case scenario - if nothing is done and all fluid leaks out and no re-routing of any hoses, what would happen? Would the pump just burn up? If the rack is operated for extended periods of time with no fluid or only residual fluid, would it eventually just break apart? Could the steering completely lock up?

As I mentioned in the other post, if my rack is shot and needs full replacement, it’s likely the end of this V70. Just trying to see how long it might reasonably be driven until it fails completely.

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Re: P80 bypass ps pump, which belt, which routing

Post by abscate » Sat Mar 16, 2019 7:37 pm

precopster wrote:
Sat Mar 16, 2019 4:34 pm
Panty hose twisted and the knot burned together with the cigarette lighter is how we made it about 200kms without an alternator. We ran into two old ladies on their way back from lawn bowls who gladly gave up a pair (not from their legs, though)

When that broke we started tearing up nylon seat covers and doing the same thing. The battery went so flat in 300kms that we made it into a town called Beaufort where a mechanic welded our alternator brackets back together. Car was a 1974 Holden TA Torana with a 1600cc Dodge Colt engine and 5 speed Mitsubishi manual trans (in our market was called a Chrysler Galant)

Once you learn how to burn the knot your home and "hosed" haha
Read that tip in the Haynes manual, no doubt.


There’s no danger to the rack, Sonic. Loss of pressure just means no assist. I’m not sure on the pump. I want to say you could make the 100 miles ok but I can’t back that with real expertise.
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Re: P80 bypass ps pump, which belt, which routing

Post by WhatAmIDoing » Sun Mar 17, 2019 12:06 am

I have been very curious regarding this topic for a while. I think the best option would be to either loop the in/out line son the pump, or make the pulley freewheel. Another option I have wanted to explore is custom fabricating a bracket to support a pulley in place of the PS pump. If done right, would still use stock belt and stock routing. Of course, this would be a more long term solution than an emergency fix. How hard is it to pull the pulley off the PS pump?

As for safety, power steering is a luxury that benefits very low speed driving (i.e. parking). At speeds above 25mph, you should be able to palm the wheel with ease. At highway speeds, PS can actually be more of a safety hazard, as it makes it easier to throw your car into a skid (unless you're into that sort of thing).
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Re: P80 bypass ps pump, which belt, which routing

Post by wizechatmgr » Sun Mar 17, 2019 12:34 am

Take the entire serpentine belt off - it isn't needed for this emergency... Pull my "red neck alternator" trick of putting a genny in the back seat with all windows open and a battery charger plugged in. ~10-15 amps @14V should do it unless headlights, brake lights, etc are on for long. Other option would be to loop power steering pump output back into suction/supply.
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