Matt Detailed Information on the M32 Gearbox Background information on the M32 gearbox The M32-6 is a 6-speed manual transmission. This transmission is being used for the first time in the Astra-H in conjunction with the Z 20 LEL DOHC II turbocharged petrol engine. This manual transmission is an all-synchromesh 3-shaft transmission. This 3-shaft transmission has the following advantages: Compact construction Improved smooth-running performance Better shift quality High torque transmission Low weight Structure of the manual transmission Location of the shafts The following cross-sectional diagram shows the location of the respective shafts in the M32-6 transmission, as per the 3-shaft principle. Upper main shaft Input shaft Lower main shaft Differential gear In this transmission angular cone bearings are used for all shafts. These bearings require a certain amount of play and pretension. The required amount of bearing play and pretension is achieved at the production stage by using shims under the angular cone bearing in the transmission housing. Location of gearwheels This diagram shows the location of the gearwheels on the respective shaft. Lower main shaft Input shaft with 1st/2nd gearUpper main shaft 1st gear gearwheel 2nd gear gearwheel 5th gear gearwheel 6th gear gearwheel 3rd/5th gear gearwheel 6th gear gearwheel 4th gear gearwheel 4th gear gearwheel Reverse gear gearwheel 3rd gear gearwheel One particular advantage of this 3-shaft transmission is that on the input shaft, the 3rd gear gearwheel is also used for 5th gear. Power flow in the individual gears The following diagrams show the flow of power in the individual gears. 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear Reverse Location of components in the M32-6 transmission The following exploded diagram shows the location of the components in the M32-6 manual transmission. The components of the individual shafts will then be described. Axle shaft seal ring Guide sleeve – differential housing Differential housing Seal ring – axle shaft seal ring sealing flange Axle shaft seal ring sealing flange Axle shaft seal ring Shim Differential assembly Transmission housing Upper main shaft assembly Input shaft assembly Lower main shaft assembly Clutch bleed connector Fastening sleeve Reversing light switch Central release Pressure line Clutch housing Gearshift assembly Magnet Oil baffle plate Location of components in upper main shaft assembly Fluid collector pipe Upper main shaft Roller bearing – upper main shaft Retaining ring Needle roller bearing – reverse gear Reverse gear gearwheel (driven) Reverse gear shift sleeve Synchro ring – reverse gear Thrust piece Synchroniser body Spacer Retaining ring 3rd gear gearwheel (driven) Needle roller bearing – 3rd gear gearwheel Intermediate ring Synchro ring 3rd/4th gear shift sleeve Thrust piece Synchroniser body Retaining ring Shim Roller bearing – main shaft Needle roller bearing – 4th gear gearwheel 4th gear gearwheel Intermediate ring Synchro ring 3rd/4th gear shift fork Gear shift shaft Reverse gear shift fork Location of components – lower main shaft assembly Thrust piece Retaining ring 1st/2nd gear shift sleeve Outer synchro ring Intermediate ring Inner synchro ring 2nd gear gearwheel (driven) Needle roller bearing – 2nd gear gearwheel Locking ring Pressure piece 5th gear gearwheel (driven) Needle roller bearing – 2nd gear gearwheel Synchro ring Thrust piece Synchroniser body Retaining ring 5th/6th gear shift sleeve Synchro ring 6th gear gearwheel (driven) Needle roller bearing – 6th gear Roller bearing – main shaft Shim 5th/6th gear shift fork Gear shift shaft 1st/2nd gear shift fork Synchroniser body Outer synchro ring Intermediate ring Inner synchro ring 1st gear gearwheel (driven) Needle roller bearing – 1st gear gearwheel Retaining ring Roller bearing – main shaft Main shaft Fluid collector pipe Location of components – input shaft assembly Input shaft seal ring Roller bearing Input shaft 1st gear gearwheel (driving) 2nd gear gearwheel (driving) Input shaft bolt Shim Input shaft bearing 6th gear gearwheel (driving) 4th gear gearwheel (driving) Spacer 3rd/5th gear gearwheel (driving) Synchronisation An improved synchronisation system, already fitted to the F40 manual transmission, is used on the M32-6 transmission. The previous sliding blocks and synchro springs have been dispensed with and have been replaced with thrust pieces. Matched synchronisation systems are also used for the individual gears. Two and three-cone synchronisation systems are used. The synchronisation systems used for each respective gear will be shown in the following. 1st/2nd gear The three-cone synchronisation system is used for these two gears. Inner synchro ring Intermediate ring Outer synchro ring Shift sleeve Synchroniser body Thrust pieces 3rd/4th gear A two-cone synchronisation system is used for these two gears. Intermediate ring Synchro ring Shift sleeve Synchroniser body 5th/6th gear A single-cone synchronisation system is used for these two gears. Synchro ring Shift sleeve Synchroniser body Reverse gear Like 5th/6th gear, reverse gear also features a single-cone synchronisation system. Gearshifting The M32-6 manual transmission also has a cable gearshift. The individual gears are selected by means of a central gearshift unit. Mark for the M32-6 manual transmission The mark for the M32-6 manual transmission consists of a bar code and a combination of numbers. The letters and numbers located below the bar code have the following meanings: M32Transmission type O“Opel” design FAM2Engine family 3.941Ratio CWheel set XXXXXXXXSerial number NRTransmission code Transmission fluid The M32-6 manual transmission uses the same transmission fluid as the F13 / F17 / F17+ / F23 / F25 / F35 and F40 transmissions. The transmission’s fluid fill quantity is 2.4 litres. Container sizeCatalogue numberPart number 1 litre SAE 8019 40 7689 120 541 60 litres SAE 8019 40 7109 194 349 Technical data The maximum input torque for the M32-6 manual transmission is 320 Nm. The weight of the M32-6 manual transmission is approx. 41.5 kg without fluid. The overall length of the transmission is 329.5 mm. Transmission ratio EngineZ 20 LEL 1st gear3.818 2nd gear2.053 3rd gear1.302 4th gear0.935 5th gear0.744 6th gear0.614 Reverse gear3.727 Output ratio3.94
