It is never pleasurable to notice a sound on your automobile that you don’t know where it comes from. You may be thinking about what to do when you detect a reversing gear noise that remains on your BMW 4 Series? Any gearbox issue can be critical, but before making sure, it is better to do a few inspections. Our team has written this document to help you deal with it. First, we will see what the sources and the different gearbox noises can be on BMW 4 Series, and second, what are the solutions available to you.reverse-gear-noise-bmw-4-series

Classical reverse BMW 4 Series noises and some tips to maintain your gearbox

Why does the reversing of my BMW 4 Series make a different noise from my other speeds?

De facto, adding all gears, bearings and pinions into a gearbox is a difficult task. The sound generated by the reversing of your BMW 4 Series is logical. It can be explained in a fairly simple way. Indeed, the gears used for conventional speeds (1st to 5th or 6th) are so-called “helical” gears (oblique gears) . The use of such a pinion makes the noise caused by the gears much less important than with spur gears implemented for the reverse gear.

Tips to reduce wear on your clutch and gearbox

  • Don’t give a big boost:
    Indeed, if you kick the throttle hard when you are in reverse or when you put the automobile in the revs, you risk to burn your clutch or gnawing at the gearbox pinions.

  • Never reverse while the automobile is in motion or vice versa:
    Reversing the direction of operation of the gearbox during operation is a very bad idea. Indeed, the pressure you will exert on the gears will be monumental and you will make a premature wear and tear of the gears. You can even break the gears of your gearbox at speed by doing so. It will therefore be completely usual if you find out a reverse noise on your BMW 4 Series if you shift gear under these conditions.

Diverse BMW 4 Series reversing noises and their origins

Finally in this section, we will move on to what you are probably most enthusiastic about in this content, to find out about the origin of reversing noise on BMW 4 Series. Here are the 3 typical noises you may be victim of.

I hear a grinding noise when starting in reverse gear

If you notice a grinding noise when you start in reverse with your BMW 4 Series, it may be the engine mounts that are tired. Indeed, when the engine is in reverse gear, due to the pinions we saw above the vibrations generated by the gearbox are higher and it is therefore possible that due to their wear the silentblocks no longer absorb the engine vibrations well. In this situation, do not hesitate to consult this paper for more details about strut mount noises on BMW 4 Series.

An increased reverse knocking noise on BMW 4 SeriesX

If you are subject to a knocking noise when you are in reverse with your BMW 4 Series and this noise tends to amplify as you gain speed. It is possible that you are confronting a serious issue that needs to be fixed quickly before ruining your entire gearbox. Indeed, an intensifying rattling noise means that the gears are damaged. If they are, debris will disperse to the rest of the box and damage other gears quickly. Take your automobile to your auto mechanic quickly or check out this content about gearbox noise on BMW 4 Series for more information.

I listen to a noise when I go in reverse

Finding out a noise when you shift into reverse is normal and connected to the gears and sprockets used in the gearbox. If, on the other hand, you have the feeling that your BMW 4 Series reverse gear makes more noise than before, it is possible that filings have been produced and are moving around in it. It is therefore time to empty the box.