Alfa Romeo MiTo

Upper layshaft

1 2

Fig. 24 plug layshaft

The upper layshaft is entirely made of steel; it is hollow so that oil can flow to the appropriate openings for lubricating the driven gear roller bearings. A plastic plug is positioned so that the oil channelled into the shaft can only flow out through the specific openings for lubricating the roller bearings on the shaft inner side. The Alfa TCT upper layshaft is the same as that of the manual gearbox. The difference concerns the position of the gears on the shaft itself. The gears interface with the shaft by means of steel bushings.

Fig. 25

1. upper layshaft inner bearing

2. 4th speed gear toothed ring

3. 2nd speed synchroniser ring

4. 5th speed gear

5. 5th speed and reverse sliding sleeve

6. upper layshaft outer bearing

7. reverse gear

8. 5th speed synchroniser ring

9. 2nd speed driven gear

10. 2nd and 4th speed sliding sleeve

11. 4th speed driven gear

12. motion transfer gear from shaft to differential

- 25 - Alfa TCT

Reverse

Motioned is reversed in the Alfa TCT by using a straight tooth idle gear installed in the gearbox and accommodated on a specific support.

1. Inner main shaft

2. Idle

3. Idle support

4. Reverse driven gear

Fig. 26

- 26 - Alfa TCT