BMW G31 530dX LCI (Mild-Hybrid): Riemenspanner wechseln – Was muss alles ausgebaut werden?

    Hallo zusammen,

    ich möchte bei meinem BMW 530d xDrive Touring LCI (G31, Baujahr 2020, Mild-Hybrid) den Keilrippenriemen sowie den Riemenspanner tauschen.

    Da es sich um den Mild-Hybrid handelt, ist der Motorraum recht voll. Ich habe bereits auf YouTube nach Anleitungen gesucht, allerdings zeigen die meisten Videos entweder ältere Modelle ohne Mild-Hybrid-System oder sparen den entscheidenden Teil aus: das Freilegen des Arbeitsbereichs.

    Deshalb meine Fragen an die Experten hier, die diese Arbeit beim LCI schon hinter sich haben:

    • Was genau muss alles demontiert werden, um gut an den Riemenspanner heranzukommen?
    • Reicht es (wie beim Vorgänger F11) aus, lediglich den Kühlerlüfter auszubauen, um genügend Platz für das Werkzeug zu haben?
    • Müssen Komponenten der AGR-Kühlung / Peripherie angefasst werden oder kann das alles drin bleiben?
    • Welches Drehmoment bekommen die Sechskantschrauben des Riemenspanners bei diesem Motor genau? (In den Videos kursieren dazu leider widersprüchliche Angaben).

    Anbei findet ihr drei Fotos von meinem Motorraum zur Veranschaulichung.

    Vielen Dank vorab für eure Hilfe und Tipps!

    My alternator/starter was broken, replaced with one from a crashed X6 because the alternator was hard to get at that time. Like 2 months delivery from OEM, nothing aftermarket and refurbished was more expensive than new.


    So if I recall correctly from that.

    Remove engine insulation at the front.

    “Bild-003”, eventually the coolant hose to have space for your wrench to release the belt. From the bottom arrow, down there release the hose. Flexible enough to move out of the way. Do not let anything fall in it!

    Then you’ve drawn the arrow over the bolt of the throttle, and you can still see one. There is a third one at the back. Then release the connectors of the throttle, before you do not really have space to release them.


    AGR is not completely removed, but I do not remember if some part above the throttle was removed as well to make some space. (Center arrow)


    Original procedure states using locking tools. But your new spanner probably comes locked in place.

    For removal of the belt we managed to do it by being with 2 persons. One to release the belts tension another to remove the belt itself.


    Torque specs, can not remember that.


    I did remove some coolant hoses, and the small coolant reservoir. Because I had to maneuver the alternator/starter in place. Probably not required for you.


    Be careful with the hard coolant line coming out of the larger coolant tank near the driver side headlight. It broke by accident.

    And I know the same happend to my sister’s 550i in the past.

    Thank you so much for your detailed description. It's been very helpful.


    I'll check again this week to see if I need to remove my parts (especially the coolant hoses) in the same or a similar order.


    Under the throttle body (the metal casting), there's a round, black plastic box/block to which the thick air hose (air intake) is connected. I'll almost certainly have to remove this plastic box because it covers the entire area.


    I previously owned the predecessor model of this BMW (which wasn't a mild hybrid), and it was relatively easy on that vehicle.

    If you drain coolant, lookup the procedure to remove air as well.


    It something allong those lines:

    Fan speed lowest but still on

    Temp at highest option

    Select eco pro, this was missing on a lot of forum posts.

    Then floor the accelerator for 10 seconds

    Start the car, tacho will give confirmation that you are starting a procedure. Let it run for 8 to 12 minutes. It will give a message on the tacho again that it is finished.

    Then fill up coolant if needed.


    I do only have access to ISTA in the workshop of a family member, so can not look it up for you. Maybe some else over here can help you out on that. Or confirm those are all the required steps.


    Remove the black housing indeed, 3 bolts in it. 2 in the front, and one in the back. 2 in front are yellow in my edit.


    With all this, I love the simplicity of wrenching on my (former) e46 even more. I’d rarely needed to lookup procedures, programming etc. It’s getting harder to work on your own stuff, but happy to share.

    I do appreciate other forums / post sharing useful info on here a lot. But the technical stuff is easier to read than to write for me as German is not my native language.