Can the gear dragging issue of Audi A4 be resolved?
1 Answers
This issue can be resolved. Causes: When quickly shifting from D to R at low speeds, the DCT sometimes pre-engages gears 1/R. At the moment before shifting from D to R, the two input shafts of the DCT rotate in opposite directions. The 1st gear shaft follows the engine, while the R gear input shaft rotates in reverse due to gear transmission as the wheels are still moving forward. At the moment after shifting to R, the clutch switches power transmission, and the flywheel instantly engages with the still-reversing R gear input shaft. The damping springs on the dual-mass flywheel release, amplifying the backlash vibration, resulting in audible noise. The instantaneous direction switch and spring energy release can also easily cause vibrations. Solutions: If the synchronizer sleeve is severely worn, it should be replaced promptly. If the engaging teeth on the gears are severely worn, they should be replaced. If the positioning spring is loose or broken, it should be replaced. If the self-locking grooves or locking balls on the shift fork shaft are severely worn, they should be replaced. If the self-locking cover plate screws are loose, they should be tightened and secured. If the radial clearance of the needle bearings is excessive, they should be replaced. If the centerline of the first shaft is not concentric with the crankshaft centerline, it should be realigned. If the synchronizer sleeve is not fully engaged, it should be adjusted.
