BMW 11141439646 Timing Case Cover, Bottom

Disconnect the negative battery cable and drain the cooling system. - Remove the radiator and fan. - Disconnect electrical plugs, remove the air cleaner, and airflow sensor. - Disconnect alternator wiring, unbolt and remove the alternator and drive belt. - Unbolt the power steering pump, move it aside, and remove the lower oil pan after draining oil. - Loosen oil pan bolts and front cover bolts. - Remove water pump, crankshaft pulley, and timing chain tensioner piston. - Remove timing chain sprockets, guide rail, and distributor components. - Remove upper timing chain guide and sprocket bolts. - Install timing chain, guide rail, and sprockets. - Engage chain with intake sprocket, then exhaust sprocket. - Install tensioner piston and torque it. - Rotate the engine to TDC of cylinder number 1, install upper timing chain guide, ensuring chain alignment. - File cover for smooth fit, replace gaskets with silicone sealer, install front cover and oil pan bolts with proper torque. - Install distributor components, torque oil pan bolts and drain plug, reverse removal steps, refill cooling system and oil pan.

To install the timing belt, replace the oil pan gasket and seals in the cover if needed. Install the timing cover with new gaskets and tighten the bolts to the specified torque. Install the intermediate shaft sprocket and tension the timing belt. Install the lower timing protective cover, TDC sender, alternator bracket, crankshaft hub, vibration damper, upper timing belt cover, and distributor cap.