BMW 11311739480 Timing Chain

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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.