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Old 04-02-2017, 12:06 AM   #1
BMWlust
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Power Steering Nightmare



Hey guys, I'm new to the BMW world (mostly Mercedes for me), but I picked up a 2001 740iL with the SLS system. Problem is...it blew up. The power steering pump completely blew the pulley out of itself. I recently installed a reman LUK pump and new belts. Ran the car and turned the wheel while pumping the brakes until all the bubbles cleared and the reservoir level stayed idle. Dropped the car, and it made a horrible grinding noise while turning, to which the pump blew the seal at the pulley again. Now, I took the lines off, the reservoir off, the pump off (have another reman coming), and I also noticed the SLS didn't kick in with the new pump. I have a feeling it's the regulator or the lever is snapped. I tested the lines, and they're solid. The reservoir pours high pressure water out so I know the filter isn't clogged. I'm a bit worried something is prematurely blowing the pumps out (or I got a bad rebuild).
Any guesses?
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Old 04-02-2017, 12:48 AM   #2
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Rebuilt parts can be garbage...Make sure you are using the right fluid, not just ATF or PS. I would just delete the SLS at all...Regulator has nothing to do with the pump, it only adjusts the level in the rear, can not blow up the pump.
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Old 04-02-2017, 03:30 AM   #3
BMWlust
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Thanks for the reply man. I was really hoping it was just a garbage pump. Many bad experiences with rebuilt equipment in heavy duty applications, so it's definitely most likely. I unfortunately, couldn't afford a brand new multi-vane pump at this moment so that was the only option. And yeah, unfortunately, for $65 a litre, I've been throwing CHF11S in :/
Now, I would love to delete the SLS. I got a full set of brand new coilovers with the car when I bought it thrown in. Would I just run a normal single stage pump without the hydraulic line for the suspension and cap the existing line?
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Old 04-02-2017, 03:39 AM   #4
BMWlust
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After some research, figured out I can just attach the return and feed lines together to "trick" the system and keep the pump running smooth
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Old 04-02-2017, 08:00 PM   #5
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No, the easy way is to cap it off right from the pump, but you need a special bolt...All the other lines get taken off.
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Old 04-02-2017, 08:49 PM   #6
BMWlust
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Ah...being as I'm only used to air suspension, may I ask about this special bolt? Haven't had any luck searching
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Old 04-03-2017, 12:00 AM   #7
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It sits at the end of the cooling line on 95-99 cars with SLS, i'm sure you can get one from a hardware supplier if needed.
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Old 04-03-2017, 04:12 AM   #8
BMWlust
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So, being as there's no loop in the system, the pressure on it won't bugger the pump up? And I assume the '01 runs the same kinda line? Haven't checked that yet, but I'll take a peek tomorrow and see. I know it's a fairly simple system, but I hear it's extremely delicate and I'm paranoid on blowing a third pump up
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Old 04-03-2017, 10:14 AM   #9
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No, the line is not the same after 99...
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Old 04-03-2017, 06:04 PM   #10
BMWlust
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Oh ok. Well I can go with the rerouting of the feed and return lines then I would assume. Either way, this will be a project once I can actually get the power steering pump back in and working haha.
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