BMW 11141739800 Lower Timing Case

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.

Loosen the alternator bracket bolt and swing the bracket out of the way. Remove the TDC transmitter and lower timing belt protective cover. Loosen the timing belt tensioner roller bolts and push the roller in to release the belt. Then, remove the intermediate shaft sprocket bolt and sprocket.