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Thread: Help with mysterious hose

  1. #1
    Join Date
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    '89 535i/5, '87 735i/A

    Help with mysterious hose

    Hi all! I'm restoring an '87 735i and I can't figure out where this hose should attach. I'm quite familiar with E34's but it doesn't have this hose that comes from the firewall towards the front.

    comes from here


    to here


    Anyone know what's the function/purpose of this hose?

    btw, VIN is 1638678
    Last edited by cirrusblau; 02-23-2018 at 05:11 AM. Reason: Reuploaded image because of f*cking Photobucket

  2. #2
    Join Date
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    11/88 E32 750iL+98 E36M3
    By VIN it is a 01/1987 E32 735iA EURO version left hand drive.
    VIN WBAGB410801638678
    Type code GB41
    Type 735I (EUR)
    E series E32 ()
    Series 7
    Type LIM
    Steering LL
    Doors 4
    Engine M30
    Displacement 3.50
    Power 155
    Drive HECK
    Transmission AUT
    Colour LAPISBLAU (173)
    Upholstery (0222)
    Prod.date 1987-01-16
    Vehicle options
    S216 HYDRO STEERING-SERVOTRONIC
    S365 Rear window safety glass
    S415 Sun-blind, rear
    S458 Electr. front seat adjustment
    S488 Lumbar support, driver and passenger
    S500 Headlight wipe/wash/Intensive cleaning
    S511 LEUCHTWEITENREGULIERUNG AUTOM / automatic headlight regulation
    S534 Automatic air conditioning
    S537 Independent ventilation control
    S540 Cruise control
    S560 Reading light in rear compartment
    S690 Cassette holder
    L807 NATIONAL VERSION JAPAN
    S979 VELOURS-floor mats front and rear

    Just a guess, the super old hydraulic headlight aim adjustment control? http://www.realoem.com/bmw/enUS/show...diagId=63_0068
    Same system was also used on the old E30 3 series and there also it did not work very well, they are talking about a switch at the knee bolster https://www.bimmerforums.com/forum/s...ustment-System
    E30
    e30_headlight_adjuster.png
    the switch on E28 http://www.mye28.com/viewtopic.php?t=92425
    E24 http://bigcoupe.com/phpBB3/viewtopic.php?t=26791
    Last edited by shogun; 05-19-2017 at 03:24 AM.
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  3. #3
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    Thanks for those leads Shogun! I've seen the level adjusters connected to the lower control arms (#3 on the realoem diagram you linked). I haven't figured out yet how they work until I've got this thing running. One thing's for sure, there's no adjuster inside the cabin. As I understand the system automatically adjust the headlight aim depending on the movement of the lower control arm. Also if the system is hydarulic it might attach to the ATF/Pentosin reservoir. I will investigate this.

  4. #4
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    also read this thread, that car also had the hydraulic headlight aim system, end 1986, he posted some parts pics of the system built year http://www.bimmerboard.com/forums/posts/1080821

    Not sure if the E32 had a switch or if that was full hydraulic automatic, have never seen such system in operation.
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  5. #5
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    way too many
    Early e28's had a vacuum hose under the dash that passed thru the firewall and attached to the intake manifold. It's purpose was to draw a token amount of cabin air past a temp sensor under the dash to help regulate HVAC temps.
    ​"Your dog is so ugly, other dogs sniff his face by mistake"

    TheStigg (aka "gale")
    92 735i 5-spd, turbo pending
    89 535i 5-spd (may she rest in pieces)
    94 325ic 5-spd
    87 325is

  6. #6
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    Updating this thread with pics of the hydraulic headlight aiming system.


    There's a linkage attached to the lower control arm to detect pitch or dive of the suspension. I guess that thing that the linkage attaches to is some kind of leveller. There two plastic hoses attached to the leveller one goes to the rear and the other goes to the front. There is nothing inside the hoses. It's dry.


    I removed the wheel well liner and saw this. Some kind of distribution block. Again empty, dry.

    I've actually deleted this feature as I've cut the hose going to the headlight which had some kind of automatic adjuster.

  7. #7
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    1992 750il / 1991 560 SE
    Wow, I never heard of this. What a weird setup. My new vehicle controls headlight pitch also when braking hard or accelerating quick, but its all electronic.
    ______________________________
    1992 750iL

  8. #8
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    1990 BMW 735iL
    That is a pretty cool and bizarre feature! How do you adjust the headlights manually?

  9. #9
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    Quote Originally Posted by chazsandiego View Post
    That is a pretty cool and bizarre feature! How do you adjust the headlights manually?
    I just replaced it with regular screw type adjuster.

  10. #10
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    best you could do, that system never worked on the long run, cracked and air came in etc., many E30 drivers converted that system in Germany with the electric aim motors from Ford Fiesta, they need a functioning headlight aim system to pass the bi-annual TUV inspection
    http://www.kurth-classics.de/bmw-e30...enregulierung/
    here a typical ready to install set with wiring http://www.lwr-shop.de/umrustkit-zur...r-bmw-e30-lwr/

    here a DIY for conversion to Ford Fieasta electric system http://wp1016621.server-he.de/fotost/f01214/f01214.htm

    Seems to be a good business in Germany to offer these conversion sets to electric aim for many brands, there is even one shop which only sells these conversion kits
    LWR Shop = LRW = LeuchtWeitenRegulierung = headlight aim control , Umbaukits für elektrische Leuchtweitenregulierung http://www.lwr-shop.de/


    here someone repaired the old system, in the hoses of the system is not hydraulic fluid, it is glycol http://wp1016621.server-he.de/fotost/f01538/f01538.htm
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  11. #11
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    Quote Originally Posted by TheStigg View Post
    Early e28's had a vacuum hose under the dash that passed thru the firewall and attached to the intake manifold. It's purpose was to draw a token amount of cabin air past a temp sensor under the dash to help regulate HVAC temps.
    Similar to E24 too I assume.
    Here the version with heater only, there are inside the cabin on the EURO E32 model http://bmwfans.info/parts-catalog/E3...rts_for_heater
    3 Temperature sensor passenger room 64111384253
    4 Vacuum hose black 11727545323 3,5X1,8
    4 Vacuum hose white 64111368684 2X4

    and that goes thru the firewall and is connected to the check valve between air intake and vacuum operated brake booster.
    In case that hose is not connected to the check valve, then the temperature regulation inside the car (version without aircon) should be very slow respectively not operating correct. The temp sensor is located passenger side LHD behind the cover in legroom
    Last edited by shogun; 02-22-2018 at 07:29 AM.
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  12. #12
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    I've reuploaded the images on my first post. Because photobucket.

    Anyway I think it has been established in this thread that this hose is the fuel return line from the pressure regulator.

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