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#1
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W126 SLS pump / PS pump integration
Had a little thought. Thinking it would be possible to run the SLS off the PS pump. This would nothing new. My Mark V ran the brake boost off of the PS pump.
Questions would be operating pressures of each system. And fluid compatibility. Otherwise I would think it would be a matter of installed a t fitting or two and a little bit of work.
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1991 560 SEL / 185k miles 1992 750il / 17k miles - project car |
#2
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The SLS operates at a much higher pressure and much lower volume than the P/S.
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90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff |
#3
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I do know that later models in the 124 line and possibly 201 line would run the SLS system off the PS pump.
I don't know which models or if you could simply swap the pump on to an older car...
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#4
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The 560 SLS system is very simple, just fix it and motor on. The high side hose is only about $80. Leaking pump needs a reseal, big deal.
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#5
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My pump is warped or something. Resealed twice now, leaks again.
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1991 560 SEL / 185k miles 1992 750il / 17k miles - project car |
#6
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Are you sure its leaking at the pump?
It could be pump-to-block, pump itself, or one of the lines coming off the pump...
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#7
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Ya, at the two halves. A pressure cleaning and dye run proved that. Well, time to take it apart. Going to a machine shop for a CNC reading.
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1991 560 SEL / 185k miles 1992 750il / 17k miles - project car |
#8
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The 6 cylinder W126s had the W124 style tandem pump.
There are two ways to do hyro boost power brakes. I'll call them the Ford way and the Audi way. The Ford way has the brake booster work like a power steering rack... when there is no assist called for the booster lets all the pressure return to the pump, just like the steering rack, so when there is no assist needed the pump doesn't work that hard. On an Audi the booster only lets fluid back when you release the pedal. There is an accumulator with a pressure relief valve that goes back to the pump. The pump charges the accumulator... the result is you get about 20 pedal presses with assistance after the engine is shut off. On the Ford when the engine stops the assist goes with it. If you wanted to convert to the W124 style tandem power steering pump I'd think it could work ok. But I'd think it would be easier to get another pump from a 560, considering they all have one. -J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#9
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Quote:
This. Simply find another replacement pump. I nabbed one from the parts yard for $10... sure it was a leaker but there are reseal kits around for it.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#10
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If these cars where around here. I would have. I will have to look at some Chicago yards the next time I am that way.
As for brake boost assist, the Ford version gave at least 3 pumps with engine off for a long time after. That was even mentioned in my manual. Pretty neat system really.
__________________
1991 560 SEL / 185k miles 1992 750il / 17k miles - project car |
#11
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Quote:
Might not be $10 but I think I got one from someone on here for $50, unit worked, no leaks.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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