3363708 - Introduction - GEARBOX

GEARBOXES

The following gearboxes are available for the Stilo

  • C514 6 speed for the 1.2 16V version
  • C514R 5 speed (R stands for 'reinforced') for the 1.6 16V version
  • C510 5 speed for the 1.8 16V version
  • C510 5 speed for the 1.9 JTD 80 bhp version
  • C530 5 speed with selespeed electrohydraulic unit for the 2.4 20V version
  • Getrag 5 speed for the 1.9 JTD 115 bhp version.

Manual gearbox external linkage

The external linkage ensures slick, noiseless manoeuvres.
1 - Gearbox control lever 2 - Support for gear selector and engagement cables 3 - Gear engagement cable 4 - Gear selector cable 5 - Gear engagement lever 6 - Selector lever on gearbox

Construction features

The structure of the gearbox consists of:

  • a gearbox casing which contains and supports the main and layshafts, rods and gear selector forks and the gear selector and engagement device.
  • a rear cover which contains the 5 speed gears and the rear bearing retaining plate for the main and layshafts (on the C.514.6 gearbox it also contains the 6 speed gears);
  • a bell housing which contains the clutch and the thrust bearing.

Main shaft

The main shaft consists of:

  • 1st, 2nd speed and Reverse gears fitted directly on the shaft
  • 3rd, 4th and 5th speed gears (and 6th for the C514.6 gearbox) fitted on the shaft.

The main shaft is supported:

  • by means of two ball bearings for the C510 gearbox
  • a front roller bearing and a rear ball bearing are present on the C514 gearbox
  • two high-precision taper roller bearings on the C530

Layshaft

The layshaft consists of:

  • for the C510 and C514 gearboxes, 1st, 2nd, 3rd, 4th, 5th (and 6th) speed gears fitted on the shaft.
  • for the C530 gearbox, 1st and 2nd speed gears fitted on needle bearings with synchronisers, and 3rd, 4th and 5th speed gears fitted to the shaft.

The layshaft is supported on:

  • a front foller bearing and a rear ball bearing for the C510 and C514 gearboxes,
  • two high-precision taper roller bearings for the C530 gearbox
Gears

For all gearboxes, gears are of the following type:

  • helical toothed for the forward speeds
  • straight toothed for reverse.
SynchronisersThe synchronizers for the forward speeds are the Borg-Warner type.For the C510 and C514 gearboxes, the arrangement for the synchronizers is the split type because the synchronizers for the 1st and 2nd speeds are fitted on the layshaft, whilst those for the 3rd, 4th, 5th (and 6th) speeds are on the main shaft.This solution reduces gearbox noise in neutral because the 3rd and 5th (or 6th) gear seats are not driven.In addition, the engagement and synchronization loads are reduced as a result of the corresponding reduction in the inert masses rotating downstream of the crankshaft.On the C530 gearbox, the synchronisers are triple cone for 1st and 2nd speed, double cone for the 3rd speed and single cone for the 4th and 5th.

Differential

The differential unit is located in the rear of the gearbox casing.

On the C510 and C514 gearboxes, this consists of:

  • a crown wheel and pinion reduction
  • a differential housing constructed in a single piece which includes the differential and planet gears.

On the C530 gearbox this consists of:

  • a crown wheel and pinion reduction
  • a differential housing made from two half casings which include the planet and satellite gears.
The differential is supported by two conical roller bearings.- The planet gears have a splined profile with which the two flanged couplings connected to the two driveshafts which transmit the power to the wheels mesh.C514 gearbox - 5 speed
1 - Thrust bearing 2 - Main shaft 3 - Planet gears 4 - Differential gears 5 - Ring gear 6 - 1st speed driven gear 7 - 2nd speed driven gear 8 - Gearbox casing 9 - 3rd speed driven gear 10 - 4th speed driven gear 11 - Rear bearing retaining plate 12 - 5th speed driven gear 13 - Layshaft 14 - Rear cover 15 - 5th speed drive gear 16 - Bell housingC514 6 speed gearbox
1 - Thrust bearing 2 - Main shaft 3 - Planet gears 4 - Differential gears 5 - Ring gear 6 - 1st speed driven gear 7 - 2nd speed driven gear 8 - Gearbox casing 9 - 3rd speed driven gear 10 - 4th speed driven gear 11 - Rear bearing retaining plate 12 - 5th speed driven gear 13 - 6th speed driven gear 14 - Layshaft 15 - Rear cover 16 - 6th speed drive gear 17 - Bell housingC510 gearbox
1 - Thrust bearing 2 - Speedometer gear 3 - Differential gears 4 - Taper roller bearing 5 - Planet gears 6 - Ring gear 7 - Taper roller bearing 8 - Differential housing bearing adjustment shim 9 - Layshaft 10 - Main shaft