BMW 11417576915 Chain

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Install the VANOS setup bracket to the front of the cylinder head timing case, tightening down uniformly until in full contact with the cylinder head.

Remove BMW special tool 116150 from the front of the cylinder head, reinstall the VANOS unit, remove BMW special tool 114.220, and reinstall the primary chain tensioner. Install the intake camshaft oil baffle, check for correct seating of half-moon seals in the back of the cylinder, and use a small amount of sealant at corners of half-moon cutouts, sealing corners in front of the cylinder head at the VANOS unit. The remainder of assembly is the reverse of removal, ensuring to secure all coolant hoses, thermostat housing, and engine coolant drains, install a new engine oil filter and oil, refill and bleed the cooling system, and use a scan tool to check VANOS operation with the engine idling.

Begin by disconnecting the negative battery cable, ensuring to follow battery disconnection cautions.

Fit the crankshaft sprocket to the chain in the correct orientation, pull the timing chain taut, and install the assembly in the housing while holding the chain under tension.

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.

For models built before January 2000, the oil pump and baffle plate are integral components, while models built after have them as separate components.

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.

- 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.

Service and repair of the camshaft timing chain necessitate the removal of the front crankshaft vibration damper, double VANOS unit, engine oil pan, and timing chain housing cover.

Reinstall the exhaust camshaft position sensor wheel, hand-tightening the nuts.

The radiator cooling fan nut has left-hand threads.