Tu es d'où ZOS ?

J'aimerais vraiment essayer une boîte problématique pour avoir mon avis.

Étant donné que ce n'est pas ta première ND, difficile de dire que tu ne sais pas manier correctement une boîte manuelle. Je suis prêt du mans/Angers/Dreux.

Pour répondre à steph 32:
J’avais aussi la 4 qui passait mal après 3-4 heures d’autoroute.
Et toutes les vitesses etaient plus durent d’ailleurs.
Je l’ai signalé à la révision et demandé une nouvelle vidange de la boîte.
D’après mon ressenti je pense vraiment qu’il y a un souci de chauffe de la boîte et de l’huile avec …

salut JAGUAR
échange de boite en garantie ??

c'est a moi de payer le liquide de boite ( )

Quelqu'un sait si Mazda prend en charges de réparations sous garantie d'une voiture modifiée?

1. The 3rd and 4th gear in the transmission (which are free spinning on the shaft when not in gear) are mated to the shaft with a ring (for some better designs, there should be a rolling pin bearing to minimize the wear). And this mating surface, due to the spinning, is producing excessive amount of metal powders, mixed with trans fluid, causing clogging of the oil path toward this ring.

2. These metal + fluid sludge can further excerbate this wear and producing more and more sludge.

3. This sludge can make the sychronizors and the free-spinning 3rd or 4th gear much easier to stick together, which in normal condition should be some back and forth play (a tiny bit of relative spinning).

4. Cannot get in gear, then push it harder. Then you'll see relative movement (that's grinding) between the locking pin (spinning with the middle large gear which is connected to the shaft by spline between the 3rd and 4th gear) and the brass synchronizer which has a groove for the pin.

5. Brass is a softer material, so the pin has shaved decent amount of material out of the synchronizer. Then you see yellow shavings in the drained fluid.

Suprisingly, the synchroizing gears on the sychronizer and the 3rd, 4th gears are intact. The only sign of the failure is at the grooves on the brass synchronizer for the locking pin.

At the end of the video, the mechanic suggests replacing the fluid with thicker ones and shorten the interval. And this problem does look like a design issue rather than a user issue.

Pour précision.
ND 2.0 184 Ch octobre 2023 . 30 000 kms