Note: Opel is constantly improving the design and equipment options of cars, therefore, depending on the engine, some other types of gearboxes can be used.
Depending on the model and layout, there are several options for converting the power flow in the gearbox - on the manual transmission F13 and F17 +, only two shafts are involved in the transmission of the power flow - the primary (leading) and secondary (day off), on the F23 manual transmission, the flow is converted using an additional intermediate shaft, and the M32 manual transmission is equipped with two output shafts. All shafts of the manual transmission are located parallel to the axes of the crankshaft and drive shafts in such a way that their teeth are in constant engagement. In the neutral gear position, the gears of the secondary shaft rotate freely on it, excluding the transmission of torque to the driven gear of the final drive.
Gear selection is carried out by means of a shift lever, which has a floor location and is located on the center console. The gearbox drive can be made in the form of traction or cables. When a gear is selected, the drive causes the corresponding shift fork to move, thereby providing a shift along the assembly of the corresponding shaft of the synchronizer clutches that are in constant engagement with it. The introduction of the synchronizer clutch into engagement with the teeth of the corresponding gear on the output shaft causes the box to provide the required gear ratio corresponding to the selected gear. The design of the synchronizers provides the required smoothness and noiselessness to the switching. Synchronizing cones are formed by machined surfaces of brake rings and gears.
Due to the complexity of the design of the manual transmission, the lack of free sale of the necessary interchangeable internal components and the need to use special equipment, the compilers of this Guide do not recommend car owners to independently overhaul the gearbox. During the disassembly and assembly procedures, the gearbox has to be removed and then replaced with many small components. It is necessary to make a lot of accurate measurements and, by selecting shims, rings and spacers, clearly set a lot of gaps. The overhaul of the manual transmission should be entrusted to car service specialists. But it must be borne in mind that repairing a box in a car service workshop is a rather expensive operation, and therefore, alternative options for replacing a failed unit with a new or restored one should be considered. Any useful information on the repair and replacement of the transmission can be obtained from Opel service stations. But regardless of the chosen method of troubleshooting (repair or replacement), independent dismantling of the box from the car will significantly reduce material costs.
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