Manual Transmission (Mt), Function

Transmission designation:

• SG - Manual transmission.
• S - Standard type of drive.
• 270 - Torque transmission in Nm.
• 5.5 - Spread (ratio of lowest to highest gear).

For manual transmission number and designation, refer to MANUAL TRANSMISSION NUMBER & DESIGNATION  table.

Transmission Number	Transmission Designation
716.60x	SG-S250/6.5
716.62x	SG-S270/5.5
716.64x	SG-S370/6.5
716.66x	SG-S400/5.3

The new manual transmission 716.6xx is a fully synchronized two-shaft transmission with six forward gears and one reverse gear and is used for all passenger car series equipped with conventional rear drive, and gasoline or diesel engines

Four versions of the 6-speed manual transmission are used, with a torque transmission capability of 250 to 400 Nm.

The 6th gear is used to save fuel and reduce engine speed.

Due to the additional 6th gear, the wider spread and the higher torque transmission, the new 6-speed manual transmission is heavier than the 5-speed manual transmission.

The manual transmission is equipped with a conventional dry clutch with automatic wear adjuster which is operated by a central clutch operator familiar from the 168 series. The transmission is maintenance-free and has a permanent oil fill.

A precise and light shift with short shifting travels is achieved by the following measures:

• Transmission of the shift lever movement to the transmission by the shift rod and control cable.
• Central shift shaft supported on needle bearings.
• Multiple-cone synchronization in 1st, 2nd, 3rd and 4th gear.
• Fully-synchronized reverse gear.

The gear assemblies and shafts are located between two bearing planes, the third bearing plane on the previous 5-speed manual transmission is no longer used.

The divided transmission housing is made up of a light metal alloy, the housing parts of which are sealed with liquid sealing agent.

The input shaft (1) is supported by a pilot bearing in the flywheel and by a deep-groove ball bearing in the transmission housing. The main shaft (2) and input shaft are inserted into each other on a common shaft plane in the transmission housing and are supported by deep-groove ball bearings.

The countershaft (3) is designed as a hollow shaft to reduce weight and is supported by a deep-groove ball bearing and a roller sleeve. The shaft play does not have to be adjusted due to the very tight production tolerances of the gear wheels and housing halves as well as the use of roller sleeves.

Additional information:

1. Manual Transmission (MT) Gear Ratios
   
   See MANUAL TRANSMISSION (MT) GEAR RATIOS  .
2. Shift, Function
   
   See SHIFTING FUNCTION  .
3. Multiple-Cone Synchronization, Location/Task/Design/Function
   
   See MULTIPLE-CONE SYNCHRONIZATION, LOCATION/TASK/DESIGN/FUNCTION  .
4. Multiple-Cone Synchronization, Task
   
   See MULTIPLE-CONE SYNCHRONIZATION, TASK  .
5. Multiple-Cone Synchronization, Function
   
   See MULTIPLE-CONE SYNCHRONIZATION, FUNCTION  .
6. Reverse Lamp Switch Function
   
   See REVERSE LAMP SWITCH, LOCATION & FUNCTION  .