BMW 11311432176 Engine Timing Chain

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- Start by removing ignition coils, valve cover, coolant, thermostat housing, and thermostat. - Remove upper timing cover bolts and cover. - Remove radiator, fan, belts, water pump pulley, damper, and crankshaft hub. - Remove cover bolts.

The timing of the intake and exhaust camshafts is variable and managed by the engine control module (ECM) through a system known as double VANOS.

Remove the intake and exhaust VANOS units by loosening and removing their mounting bolts, disengaging the timing chain, and setting the units aside.

The engine being described is a 6-cylinder (M54) engine.

Special BMW service tools are essential for camshaft disassembly and timing chain removal and installation, ensuring proper timing of the valve train.

The car should be raised safely, and the engine cooling system and oil should be drained.

Install the oil pan with a new gasket, reinstall the crankshaft vibration damper, and ensure not to use BMW special tool 115180 to hold the crankshaft stationary when tightening the vibration damper mounting bolt; instead, have a second person hold special tool 118190 while tightening.

Ensure the arrow on the upper primary sprocket lines up with the upper edge of the cylinder head, repositioning if necessary.

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.

Install a new O-ring seal on the relief valve spring cap and reinstall the components, ensuring not to damage the spring cap surface.

Remove the camshaft position sensor wheel from the exhaust camshaft sprocket and the plate spring, followed by the three intake camshaft sprocket nuts and the corrugated washer, and then the three screws from the exhaust camshaft sprocket.