It is never enjoyable to discover a sound on your vehicle that you don’t know where it comes from. You may be wanting to know what to do when you find a reversing gear noise that continues on your Mercedes Classe A 4? Any gearbox problem can be serious, but before making sure, it is better to do a few checks. Our team has created this document to support you deal with it. First, we will see what the sources and the different gearbox noises can be on Mercedes Classe A 4, and second, what are the solutions available to you.
Classical reverse Mercedes Classe A 4 noises and some tips to preserve your gearbox
Why does the reversing of my Mercedes Classe A 4 make a different noise from my other speeds?
De facto, adding all gears, bearings and pinions into a gearbox is a difficult process. The noise caused by the reversing of your Mercedes Classe A 4 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 less strong than with spur gears implemented for the reverse gear.
Tips to limit wear on your clutch and gearbox
- Don’t give a big boost:
Certainly, if you kick the throttle hard when you are in reverse or when you put the vehicle in the revs, you risk to burn your clutch or gnawing at the gearbox pinions. - Never reverse while the vehicle is in motion or vice versa:
Reversing the direction of operation of the gearbox during operation is a very bad plan. Indeed, the pressure you will apply on the gears will be significant and you will generate 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 normal if you notice a reverse noise on your Mercedes Classe A 4 if you shift gear under these conditions.
Different Mercedes Classe A 4 reversing noises and their causes
Finally in this section, we will move on to what you are probably most curious about in this content, to learn about the origin of reversing noise on Mercedes Classe A 4. Here are the 3 typical noises you may be victim of.
I notice a grinding noise when starting in reverse gear
If you discover a grinding noise when you start in reverse with your Mercedes Classe A 4, it may be the engine mounts that are tired. Certainly, when the engine is in reverse gear, due to the pinions we saw above the vibrations made by the gearbox are higher and it is therefore conceivable that due to their wear the silentblocks no longer absorb the engine vibrations well. In this case, do not hesitate to read this paper for more information about strut mount noises on Mercedes Classe A 4.
An increased reverse knocking noise on Mercedes Classe A 4X
If you are subject to a knocking noise when you are in reverse with your Mercedes Classe A 4 and this noise tends to increase as you gain speed. It is conceivable that you are dealing with a serious problem that needs to be fixed as soon as possible before ruining your entire gearbox. Indeed, an intensifying rattling noise means that the gears are damaged. If they are, debris will propagate to the rest of the box and damage other gears in short order. Take your vehicle to your auto technician quickly or check out this content page about gearbox noise on Mercedes Classe A 4 for more data.
I hear a noise when I go in reverse
Experiencing a noise when you shift into reverse is normal and related to the gears and sprockets used in the gearbox. If, on the other hand, you have the feeling that your Mercedes Classe A 4 reverse gear makes more noise than before, it is conceivable that filings have been produced and are moving around in it. It is therefore time to empty the box.
