Power steering pump change
Power steering pump change
I was told it's possible to get a PAS pump for the 606 that only runs at 75bar instead of the 115bar the standard one runs at, possibly off a w201.
either that or I need to find a w210 pump, without rear hydraulic suspension, and change the output pressure.
Any ideas?
Thanks
Mat
Hi,
I was told it's possible to get a PAS pump for the 606 that only runs at 75bar instead of the 115bar the standard one runs at, possibly off a w201.
either that or I need to find a w210 pump, without rear hydraulic suspension, and change the output pressure.
Any ideas?
Thanks
Mat
You can just shorten the spring in your existing pump. You're welcome to borrow my guage if it's useful? Be careful when testing, the pump gets hot pretty quick since while you're testing there's nowhere for the fluid to go!
1992 W201 190D 2.0L and 1971 W108 280SE with OM606, electronic pump and 6 speed manual gearbox.
Yes Matt,
You can just shorten the spring in your existing pump. You're welcome to borrow my guage if it's useful? Be careful when testing, the pump gets hot pretty quick since while you're testing there's nowhere for the fluid to go!
1992 W201 190D 2.0L and 1971 W108 280SE with OM606, electronic pump and 6 speed manual gearbox.
(03-08-2016, 02:44 PM)matfield Great... Thanks a million.
Can you remember roughly what % of the spring you cut off to go from 100bar to 60bar?
I can't, but I've the power steering disconnected at the moment so I'll pull it out and take a photo for you. I'll try to do it tonight.
To get the relief valve out, unscrew the fitting on the pump that the high pressure hose connects to:
![[Image: Selection_177_zpsmi0uy1p7.png]](http://i307.photobucket.com/albums/nn315/prynatcc/Merc%20280SE/Selection_177_zpsmi0uy1p7.png)
Once that fitting is removed, the pressure relief valve can be pulled out from the pump housing. Just grab it and pull, it shouldn't be tight.
![[Image: Selection_179_zps6yi0re2i.png]](http://i307.photobucket.com/albums/nn315/prynatcc/Selection_179_zps6yi0re2i.png)
Then hold the body of the valve in a vice (I wrapped a rag around it to avoid causing any damage) and remove the end cap. Be careful not to loose the little ball bearing! You can see the components in the photo below.
![[Image: Selection_178_zps3tzn1m10.png]](http://i307.photobucket.com/albums/nn315/prynatcc/Merc%20280SE/Selection_178_zps3tzn1m10.png)
In standard form, I measured about 100bar of pressure. I had hoped to adjust it by adding shims but that made very little difference so I just ground the end off the spring progressively until pressure was down to about 60 bar. I have ended up with 1.65mm of shims and a spring that is 15.55mm long.
![[Image: re_P1010858_zpsfqu6pzas.jpg]](http://i307.photobucket.com/albums/nn315/prynatcc/Merc%20280SE/re_P1010858_zpsfqu6pzas.jpg)
1992 W201 190D 2.0L and 1971 W108 280SE with OM606, electronic pump and 6 speed manual gearbox.
Mat, To reduce the pressure being output by the standard W210 OM606 power steering pump, just remove the pressure relief valve dismantle it and shorten the spring.
To get the relief valve out, unscrew the fitting on the pump that the high pressure hose connects to:
Once that fitting is removed, the pressure relief valve can be pulled out from the pump housing. Just grab it and pull, it shouldn't be tight.
Then hold the body of the valve in a vice (I wrapped a rag around it to avoid causing any damage) and remove the end cap. Be careful not to loose the little ball bearing! You can see the components in the photo below.
In standard form, I measured about 100bar of pressure. I had hoped to adjust it by adding shims but that made very little difference so I just ground the end off the spring progressively until pressure was down to about 60 bar. I have ended up with 1.65mm of shims and a spring that is 15.55mm long.
1992 W201 190D 2.0L and 1971 W108 280SE with OM606, electronic pump and 6 speed manual gearbox.
LongOldLandy
03-09-2016, 05:42 PM #8Brilliant write-up Pyrantcc, thanks for this - will be very useful for my own conversion.
If my power steering works, great, and I'll have reduced the pressure to a point. If it doesn't work, I'll just have to get another spring. We'll see what happens.
Also, Baldur, I really hope this is the piece you were talking about,
(the connector block is just for scale) between the PAS and SLS pump, because if not I'm in trouble! Another think, DO NOT open the back of the pump when it's in a bench vice, the inside of the pump will fall out all over the workshop floor and you'll spend 15 mins looking for the 10 little pieces of pump internal, before cleaning them and trying to put it all back together!
Ok... So I pulled the pump apart this evening, and the Spring was nothing at all like the one above, it was 50mm long and the valve system didn't look like above at all, so I took 1.5 coils off the spring and put it back in.
If my power steering works, great, and I'll have reduced the pressure to a point. If it doesn't work, I'll just have to get another spring. We'll see what happens.
Also, Baldur, I really hope this is the piece you were talking about,
(the connector block is just for scale) between the PAS and SLS pump, because if not I'm in trouble! Another think, DO NOT open the back of the pump when it's in a bench vice, the inside of the pump will fall out all over the workshop floor and you'll spend 15 mins looking for the 10 little pieces of pump internal, before cleaning them and trying to put it all back together!
I am looking for a suitable electric pas pump as I need to delete my belt driven one for manifold / boost hose reasons.
Has anybody experience with that? Many Peugeot/Citroen here in UK have elec pas pumps but they are shit and unreliable. BMW or Volvo would be better if they came with elec? But must be 115bar-ish..
Beers.
Installed:
OM606/722.6, big IC, W220 brakes.
Planned:
DIY manifold, compound, 722.6 controller, built IP.
[i]Less rust.. [/i]
Yes that's the right bit. I did the same, bits fell on to the garage floor goo mixture of swarf, sawdust & axle grease.
I am looking for a suitable electric pas pump as I need to delete my belt driven one for manifold / boost hose reasons.
Has anybody experience with that? Many Peugeot/Citroen here in UK have elec pas pumps but they are shit and unreliable. BMW or Volvo would be better if they came with elec? But must be 115bar-ish..
Beers.
Installed:
OM606/722.6, big IC, W220 brakes.
Planned:
DIY manifold, compound, 722.6 controller, built IP.
[i]Less rust.. [/i]
But you do need to have a manual steering rack to go with it. A hydraulic rack has play in it when there's no hydraulic pressure which makes it a bit unpleasant for that use.
Baldur Gislason
I only have experience with the fully electric PAS found in Opels, that's a very nice solution for retrofitting as all of the hardware goes inside the car, no hydraulics at all and no clutter under the hood.
But you do need to have a manual steering rack to go with it. A hydraulic rack has play in it when there's no hydraulic pressure which makes it a bit unpleasant for that use.
Baldur Gislason
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Mercedes 190 -92, om605 Stroker 2.75L, Dieselmeken 7,5mm (160cc) EDC with Baldur DSL1 ECU, Garrett GTX3576R A/R 1.06 without WG, SMF, 716.661 (SG-S370/6) Gearbox
I know a guy that uses a electric servopump from a V50 volvo in his 190.
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Mercedes 190 -92, om605 Stroker 2.75L, Dieselmeken 7,5mm (160cc) EDC with Baldur DSL1 ECU, Garrett GTX3576R A/R 1.06 without WG, SMF, 716.661 (SG-S370/6) Gearbox
(03-13-2016, 07:17 PM)EvoPeter I know a guy that uses a electric servopump from a V50 volvo in his 190.
Amazing, just what I needed to know, thanks!
Installed:
OM606/722.6, big IC, W220 brakes.
Planned:
DIY manifold, compound, 722.6 controller, built IP.
[i]Less rust.. [/i]
The right one
![[Image: _medium.jpg]](http://sultzi.kuvat.fi/kuvat/Ford+Cortina+-71+V6/DSC_0229.JPG/_medium.jpg)
You can see it on the left corner of the trunk
![[Image: _medium.jpg]](http://sultzi.kuvat.fi/kuvat/Ford+Cortina+-71+V6/DSC_0244.JPG/_medium.jpg)
Old topic, but I have toyota mr2 electric pas on the trunk of my Ford. It automatically goes to idle if steering wheel is stationary long enough. Would work better with vss signal, but I drive it without.
The right one
You can see it on the left corner of the trunk
(12-04-2016, 05:04 AM)Sultzi Old topic, but I have toyota mr2 electric pas on the trunk of my Ford. It automatically goes to idle if steering wheel is stationary long enough. Would work better with vss signal, but I drive it without.Nice! Is that a BMW coolant circ pump on the left??
The right one
You can see it on the left corner of the trunk
Installed:
OM606/722.6, big IC, W220 brakes.
Planned:
DIY manifold, compound, 722.6 controller, built IP.
[i]Less rust.. [/i]
(12-04-2016, 05:04 AM)Sultzi Old topic, but I have toyota mr2 electric pas on the trunk of my Ford. It automatically goes to idle if steering wheel is stationary long enough. Would work better with vss signal, but I drive it without.Nice! Is that a BMW coolant circ pump on the left??
The right one
You can see it on the left corner of the trunk
Installed:
OM606/722.6, big IC, W220 brakes.
Planned:
DIY manifold, compound, 722.6 controller, built IP.
[i]Less rust.. [/i]
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