BMW 11667519457 Vacuum Pump

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The 3.0L models utilize a vacuum pump on the left side of the cylinder block, driven by a chain from the crankshaft sprocket, due to the Valvetronic system. To replace it, remove the drivebelt, tensioner, vacuum pump cover, and intake manifold. Rotate the crankshaft pulley bolt until the vacuum pump sprocket holes align with mounting bolts. Secure the sprocket, loosen the retaining bolt and pump bolts. Push the chain tensioner right and lock it. Unscrew the bolts, replace the pump, and use a new gasket. Reverse the process to install.For 2.0L models, the vacuum pump is at the rear of the valve cover, driven by the exhaust camshaft. Remove engine covers, trailing link, and sound insulation cover. Disconnect the vacuum line and battery cable. Remove the turbocharger vacuum line screw and disconnect the line to the control unit. Unscrew and pull off the pump. Replace the O-ring if needed, lubricate, and re-install by rotating and pushing into the camshaft gear. Secure with screws and reverse the steps for the rest.