BMW 11411439260 Oil Pump

The fasteners in the oil pump assembly, including the sprocket retaining nut, may loosen and fall off into the oil pan, so it is essential to install these fasteners with Loctite® or an equivalent thread locking compound and torque them to specifications. Begin by removing the lower oil pan, and if applicable, take out the oil pump sprocket cover fasteners before removing the cover. Unclip the crankcase breather oil return line, then remove the oil pump sprocket nut and detach the sprocket and drive chain from the pump. Unbolt the oil pump mounting fasteners and remove the pump, followed by inspecting the oil pressure relief valve. Replace the O-ring seals on the engine oil pipes, ensuring they are lightly oiled, and take care not to damage the O-rings on sharp edges of the engine block during reinstallation. Replace the sealing O-ring in the oil pump and turn the threaded spacer on the pump fully to stop. Reinstall the pump, coating the left side pump mounting fasteners with Loctite® or an equivalent thread locking product before installing and tightening them. Coat the pump sprocket shaft threads with Loctite®, then reinstall the pump sprocket with the drive chain and tighten the mounting nut. Use an Allen wrench to adjust the chain slack by turning the threaded spacer, coat the remaining oil pump mounting fastener with Loctite®, and install and tighten it. The remainder of the assembly follows the reverse order of disassembly. After adding engine oil, start and run the engine, raising the engine speed to 2,500 rpm until the oil pressure warning light goes out.

The 6-cylinder engine oil pump is mounted at the bottom of the engine block surrounded by the cradle and is geared by means of a chain and sprocket system taking its drive from the crankshaft. The front suspension requires to be dropped for the oil pump to be removed, and the oil pan to be taken out. First, take out the oil pump sprocket mounting nut, which will be turn in an anti clockwise direction on the block of the engine. Raise the sprocket away from the pump with the drive chain and remove the oil pump screws that are fixed on the engine casing. Subsequently, the oil pump pick-up tube bolts have to be unscrewed accompanied by the pick-up tube and followed by the pump removal. Any spacers that exist between the pump and the engine block should also be documented in order to be put into a different category. Rotate the oil pump shaft so as to check on the teeth of the gears, replace the pump if the gears do not rotate as required. Check also the oil pressure relief valve as it may also be affected at times. During installation reverse the process adopted while undertaking deregistration whereby the pump locating dowels should not be damaged and should be properly located. Changing the sealing O-rings of the oil pick-up and return tubes and rotating the sprocket splines to fit the oil pump shaft splines have to be done before fastening the sprocket nut which should be tightened with anticlockwise turn. At last add oil to the engine, start the engine and observe for any signs of oil leakage.