BMW 23001220374 Exchange 5 Speed (Overdrive) Gearbox

All tasks related to transmission removal and installation on different BMW models need two essential components: transmission support and specialized tools for driveshaft locking ring torque. Start the procedure by disconnecting the battery cable along with taking off throttle nuts from the adjusting position and removing the tether. Start the process by taking out the exhaust system with heat shield while draining transmission oil through disconnecting the oil cooler lines. Start by supporting the transmission before you detach its torque converter housing from its position and remove all bolts linking the torque converter to the drive plate. Discharge the speed and reference mark sensors while disconnecting their electrical connector then support the transmission with a jack. First disconnect the transmission shift rod before you take out the driveshaft and lower the transmission to access the engine bolts. Installation of the converter requires correct engagement as well as securing the driveshaft lock-ring followed by installing self-locking nuts and preloading the center mount and reconnecting the electrical connector. Adjust throttle cables first before you align the transmission to the engine and check the condition of flexplate components and dowel sleeves. You must install the shifter cable after bolt torque and then fit the driveshaft before fluid addition into the transmission unit. Place the gear selector lever in P position first before holding the bolt located on the transmission shift lever for shift linkage cable and rod adjustments. The final step requires an adjustment of the throttle linkage for proper function and safe distance from the throttle body.

Symptoms of a transmission problem can be such as, noise on shifting into the forward gears such as grinding, this will required one to check the clutch release system, adjust the mechanical or cable linkages depending on the type of the system or refill the hydraulic fluid in case the clutch release system is hydraulically operated. In particular, worn synchronisers or sliding sleeves may be repaired or replaced only with the help of transmission removal and similar is with damaged gear engagement dogs. If the transmission jumps out of gear, it can be shifted by worn shift shaft detent springs, synchroniser sliding sleeves or gear engagement dogs, as well as worn crankshaft thrust bearings which would need dismantling of the engine and crankshaft in turn. Problems in shifting may include improper clutch adjustment, worn synchronizers, a seized pilot bearing and a seized shift linkage, which may require the removal of worn bushings. Leakages could be from over fillings, blocked vents, or from leakages in the cast iron, seals or gaskets which require overhauling of the fillings and changing of the affected cast iron, seals or gaskets.

Power in lower gears and reverse is transmitted via a countershaft.