BMW 23007626310 Exchange 6 Speed Gearbox

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This is a complex operation that involves removing the transmission from the vehicle. Before starting, make sure you have the necessary lifting and support equipment. Begin by disconnecting the negative battery cable and raising the vehicle on jackstands. Remove the engine/transmission under-shields, starter motor, and driveshaft. Take off the under-shield bracket and shift lever support bracket from the transmission. Disconnect the selector rod pin and remove the clutch release cylinder. Disconnect all electrical connectors and remove any wiring harnesses from the transmission case. Remove the exhaust mounting bracket if applicable. Unscrew the bolt securing the engine/transmission adapter plate and remove the flywheel lower cover plate if necessary. Place a block of wood between the engine oil pan and steering gear to prevent tipping. Use a transmission jack to support the transmission and remove the crossmember and mounts. Remove the engine-to-transmission bolts and slide the transmission rearward to disengage the input shaft from the clutch. To install, check the clutch friction disc and inspect the clutch release bearing and lever. Make sure the transmission positioning dowels are in place and tighten all fasteners to their specified torque. Grease the gear selector arm pivot pin and gear selector rod pin before installation. Reconnect the driveshaft and install the starter motor.

Overhauling a manual transmission can be a challenging task for home mechanics. It involves disassembling and reassembling numerous small parts, as well as accurately measuring and adjusting clearances using shims and spacers. Obtaining internal transmission components can be difficult and expensive. Therefore, it is often recommended to have the transmission overhauled by a qualified transmission shop or dealer, or to obtain a reconditioned unit. However, experienced mechanics with the necessary tools can undertake the overhaul in a systematic manner. The tools required include snap-ring pliers, bearing pullers, a slide hammer, pin punches, a dial test indicator, and possibly a hydraulic press. It is important to carefully document the installation of each component during disassembly to facilitate reassembly. Additionally, having an understanding of the specific area of malfunction can aid in component examination and replacement.

The first step is to identify whether the issue is electrical, mechanical, or hydraulic in nature.

Before starting the transmission removal process: Read through the procedure thoroughly to understand it. Ensure you have adequate lifting equipment or jacking/support equipment. Prepare a suitable tool for aligning the torque converter during transmission installation. Be aware that new fluid pipe O-rings may be required.