Z3 Power Steering Service Question (

[aba4430]

I have been busy doing PM on my 328Ci. Have replaced front struts, strut mounts, spring pads, front end links, stab. bar bushings, engine and transmission mounts thus far. Am awaiting the delivery of PS hoses and will replaces hoses and PS reservoir in the next week.

I am also getting ready to service the steering system and a few other items on the Z3 (HVAC control lamps, motor and tranny mounts, front control arms and bushings, tranny and differential oil etc.). The steering system component diagram and part details are in the link. My question pertains to part number 7. I see no equivalent replacements from Rein or Gates for this hose. The BMW part is pricey at about $180. It appears to be just a return hose from the cooler to the reservoir. The other three hoses (#'s 01, 03, and 10) will be Rein hoses and are reasonably priced. Question is whether

I could use a compatible Gates, CRP, Goodyear or Dayco hose for this application.

I will also put the Z3 on stands and do a careful inspection of this hose prior to ordering. Worst case, will spring for the BMW hose. Thanks in advance.

https://www.realoem.com/bmw/enUS/sho...diagId=32_1112

[CB750]

I'm in the same situation; I thought it would be a good idea to refresh all the power steering hoses, most of which are available via a variety of vendors, but no dice with the #10 (M Roadster diagram) return hose.
I typically go with genuine BMW parts when the situation deems the lofty pricing necessary, but I'm not paying $200 for less than a meter of hydraulic hose, sans fittings.
I assumed the rather complex P/S pressure hose with lots of bendy hardline and banjo fittings would be pricey, but the BMW part price is basically the same as the chunk of naked rubber return hose. WTF?

Anyway, although the return hose apparently has an 11.3mm I.D. it appears that regular ol' 1/2" (12.7mm I.D.) hydraulic hose works fine:

https://www.bimmerforums.com/forum/s...ment-21-vs-178

[aba4430]

Thanks for the information. This gives me some leads. I will post an update.

[aba4430]

I tried searching for 15/32" ID hoses (~11.5 mm ID) and was generally unsuccessful. I am thinking of ordering p/n 32411094811; the Rein equivalent is

PSH0142. The cooler pipe and reservoir hose connection dimensions should be similar between models; I hope anyway. Will update.

https://www.rockauto.com/en/partsear...um=32411094811

[PbFut]

7/16" ID hose is your better choice over 1/2". The pressure on the return line is almost nothing but you still don't want any leaks or weeps as over time it will be a mess.
Fuel line generally does not stretch much, but it slides on with little effort presumably compressing the inner rubber of the line some. I use it all the time on FrankenCoupe running both a M3 hard line cooler on the rack as well as the Z3M remote cooler in front of the radiator.

[aba4430]

Thx. for the suggestion, PBFut.

[CB750]

Yeah, despite the link to a success story for 1/2" hose I posted above, I would be inclined to go with -08 AN hose; this Jeg's hose for instance (0.438" / 11.1mm I.D.):

https://www.jegs.com/i/JEGS/555/110920/10002/-1

[PbFut]

This is the stuff I use. https://www.summitracing.com/parts/dac-80066 I have a roll of it in the drawer. Holds up well and fits better than I thought it would.
I would not use braided line unless you plan on putting the correct fittings on the end. You can't tighten down braided line with a hose clamp enough to get a tight seal and the little ends are like baby rattle snakes waiting to bight you when you brush by working on the next project.

[KeysCoupe]

Look up "push lock" hose. Parker and several other companies carry this stuff. NAPA stores may still carry it under the Weatherhead name. It looks like a cloth braid on the outside, and its made to seal onto a barb type fitting without the need for a clamp. If you have the correct size, it will push on with resistance, then pull hard on it to cinch is down tight. It usually is not used under much pressure, but old VWs and BMWs used it for fuel hose until pressures rose into the 25-35 psi range as fuel injection became more popular.
This stuff should work fine for the steering return line. The above mentioned brands are likely in inch fractions, and BMW surely is metric, the reason PbFut says 7/16" is the "best" size.
-Donny

[aba4430]

Ordered the following PS hoses. Number 3 (return hose) below is what I am concerned about. If I cannot make it work, will source one locally. Also ordered a ZF PS reservoir.

1. BMW Power Steering ReturnHose - Rein 32411093761
2. BMW Power Steering PressureHose - OEM Rein 32411095952
3. BMW Power Steering ReturnHose - Rein 32411094811
4. BMW Power Steering SuctionHose - Rein 32411093460

[Z-Thrizzle]

This is the stuff I use. https://www.summitracing.com/parts/dac-80066 I have a roll of it in the drawer. Holds up well and fits better than I thought it would.
I would not use braided line unless you plan on putting the correct fittings on the end. You can't tighten down braided line with a hose clamp enough to get a tight seal and the little ends are like baby rattle snakes waiting to bight you when you brush by working on the next project.

I might have to get that hose. The reservoir is a pain to get to with a supercharger and I want to relocate it.

[aba4430]

So I have all my parts (hoses and reservoir) to replace the old ones on the Z3. One question - the ZF reservoir now includes a cap that states "CHF 11 S Only". My reservoir is a BMW reservoir with the BMW logo shabbily ground out (Price is <$18 vs. the ZF BMW version slightly under $63). Now, to keep things elegant, I can buy a $16 BMW sticker that states "ATF Only" or use the old cap after transferring the o-ring from the new cap. Can anyone confirm whether the cap has a check valve in the vent line? If so, can I gently blow or clean the vent line, transfer the o-ring from the new cap and be on my way?
https://www.ecstuning.com/b-genuine-.../71246798132/#


IMG_1464 (004).jpgIMG_1450.jpgIMG_1453.jpg

[aba4430]

So I have taken all my PS hoses off, but am confused about the PS pressure hose, P/N 32411095952 (Rein PSH0258). Please see the pictures for reference. The lower hose is the new Rein hose and the one above is the old one from the car. The new one is nothing like the original one off the car. The label on the Rein hose bag indicates that it replaced P/N 32411095952. The other three hoses received appear to be compatible. I will add more notes later on the one that started this topic (return hose, part # 7 in link below). However, any feedback is appreciated. Car is down; worse case, I can reuse the pressure hose that came off with new o-ring and flat washers. It does not appear to have been leaking at all.
IMG_1501 (002).jpgIMG_1502 (002).jpgIMG_1503 (002).jpg

https://www.realoem.com/bmw/enUS/sho...diagId=32_1112

[aba4430]

Looks like BMW changed the PS pressure hose design later to the one I received. However, in order to use the new hose, I will have to procure a BMW bracket and a couple of types of hex bolt/washer combos. Working with the parts supplier now. The hose I removed, other than the metal tubing bends, appears similar to a pressure hose specified for the 4 cylinder Z3 (Rein PSH0257). Will update with more information later.

[aba4430]

Put the new hoses on the car yesterday, but have not filled with ATF as yet. I ended up installing the new pressure hose P/N 32411095952 (Rein PSH0258), but am awaiting a bracket and a couple of different bolts to arrive next week. However, the return hose that started this thread (part 7 in the link) https://www.realoem.com/bmw/enUS/sho...diagId=32_1112, can be substituted with BMW P/N 32411094811 (Rein P/N PSH0142), https://www.fcpeuro.com/products/bmw...z3-32411094811. You simply have to cut it to length. This part is ~$17 vs. the actual replacement specified by BMW, https://www.fcpeuro.com/products/bmw...z3-32411094558, which is pricey for a straight section of low pressure PS hose. See pictures of the old and new hoses and the modified new hose. Separately, the Rein parts appear to be of excellent quality, and the intake hose was actually labeled BMW.

IMG_1508.jpgIMG_1510.jpgIMG_1506.jpgIMG_1507.jpg





- - - Updated - - -

Does anyone have a handy picture of how/where the PS pressure hose bracket is secured under the car? Thx. in advance.

[aba4430]

Update: I received the BMW bracket and bolts yesterday and was able to secure the pressure hose satisfactorily on the car. Took about a quart of ATF to replenish the system. Overall, this is quite a simple job.

IMG_1514.jpgIMG_1539.jpgIMG_1543 (002).jpg

[solimans]

Update: I received the BMW bracket and bolts yesterday and was able to secure the pressure hose satisfactorily on the car. Took about a quart of ATF to replenish the system. Overall, this is quite a simple job.

IMG_1514.jpgIMG_1539.jpgIMG_1543 (002).jpg

Doing this job now...

1999 coupe 2.8

Question: Did you have to create the mounting location for the bracket or is it stock? (regarding #3 in diagram). btw this part on my car also looked completely different (hose shape). Guess that's the old part...

The return hose (#7 in diagram) fit for me. Looks like an exact match. Just fyi. I think the reservoir is located in different places for different years...

For the reservoir, I got the rein replacement. Going to switch over the cap and o-ring. Is that not recommended (I think someone mentioned a vent valve in the cap?)

Screen Shot 2020-08-01 at 11.12.53 AM.png

[aba4430]

So you also had the short curved pressure hose from the factory. If so, you will have to order the bracket and hardware. The threaded bolt holes are in the correct locations for the bracket/hose and bracket/engine locations. I just went with the ZF reservoir and used the new cap. I may have to handwrite ATF only on the reservoir someday. You could use the old cap with a new seal; might work OK.

[solimans]

So you also had the short curved pressure hose from the factory. If so, you will have to order the bracket and hardware. The threaded bolt holes are in the correct locations for the bracket/hose and bracket/engine locations. I just went with the ZF reservoir and used the new cap. I may have to handwrite ATF only on the reservoir someday. You could use the old cap with a new seal; might work OK.

Yes sir, I did. Like that design better.

The new design is kinda close to the sway bar. Got me worried







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[aba4430]

I mounted the hose lower and closer to the steering rack vs. your set up. If you feel you are too close to the stabilizer bar, you may be able to play with the position of the padded clamp to get maximum clearance etc. But looks good.

[solimans]

I did notice that. Had it mounted the other way and it was touching the sway bar. Flipped the clip over and ended up there