How to install and timing the primary and secondary timing chains and camshafts in M54 six cylinder engine on BMW X3?

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Ensure camshafts are locked in TDC position using BMW special tool set 113240. Inspect timing chain sprockets, guide rail, and tensioner rail for damage, replacing any worn or damaged parts; if sprockets are replaced due to wear, also replace the chain. Install the primary timing chain to the crankshaft sprocket and hang the upper end from the exhaust camshaft. If necessary, replace the crankshaft front seal in the timing chain cover. To install the lower timing chain cover, clean the sealing surfaces, use new gaskets and a coolant pipe O-ring, remove dowel pins from the engine block, drive dowels into the cover until they slightly protrude, apply a small bead of silicon sealer to the corners where the timing cover meets the cylinder head and engine block, tap the cover into position until firmly seated, install all bolts hand tight including two Torx bolts from above, install the secondary chain lower guide, and tighten cover mounting bolts alternately and in stages. 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. Remove the crankshaft locking tool. Fit the top sprocket to the primary timing chain and install it on the exhaust camshaft, ensuring the pointer on the sprocket lines up with the cylinder head sealing surface. Position the sprocket so that chain slack is on the tensioner rail side, insert BMW special tool 114220 in the cylinder head, and screw in the adjustment screw until it contacts the tensioning rail and removes chain slack. Ensure the arrow on the upper primary sprocket lines up with the upper edge of the cylinder head, repositioning if necessary. Install and tighten down threaded locating studs in the end of the exhaust camshaft, then install the secondary chain tensioner on the cylinder head while keeping it compressed using BMW special tool 113291 or a suitable pin tool. Fit the exhaust camshaft splined sleeve, aligning the gap in the sleeve splines with the corresponding gap on the camshaft splines, and slide the splined shaft on the exhaust camshaft, ensuring the locating tooth fits into the spline gaps. Push the splined shaft in further to rotate the splined sleeve until the three threaded holes in the primary chain sprocket are centered in the splined sleeve's slots. Time the intake to exhaust sprockets using BMW special tool 116180, position the spline gap on the intake sprocket, and place the secondary chain on the sprockets, ensuring not to alter the position of the sprockets with respect to the chain when removing from the special tool. Slide the splined shaft onto the intake camshaft until approximately 1 mm of splines are visible, install the intake camshaft spring plate with the FRONT mark visible, and install mounting nuts finger tight. Insert sprocket mounting bolts on the exhaust side camshaft assembly, initially tightening to approximately 5 Nm and then backing off by half a turn. Fit the thrust spacer on the exhaust camshaft, install the spring plate ensuring the F mark is visible, and if not, install the spring plate with the convex side facing forward. Install the exhaust camshaft impulse wheel, aligning the pointer with the top edge of the cylinder head, and install mounting nuts finger tight. Pull out the exhaust camshaft splined shaft to stop, press down on the secondary chain tensioner, and remove the tensioner lock-down tool. Preload the primary chain by tightening the adjusting screw on BMW special tool 114220 to the specified torque, and preload the exhaust camshaft spring plate by pressing on the impulse wheel while tightening the mounting nuts finger tight. Install BMW special tool 116150 to the front of the cylinder head timing case, install nuts finger tight, then tighten down uniformly until the special tool is in full contact with the cylinder head. Ensure gasket material is removed from the face of the cylinder head, clean the sealing face, and keep it free of oil. Secure the camshaft sprockets and impulse wheels by tightening mounting screws on the exhaust camshaft impulse wheel to approximately 5 Nm, tightening mounting nuts on exhaust and intake sprocket assemblies to approximately 5 Nm, and torque down mounting screws and nuts to final specifications. Remove the crankshaft locking tool, allowing the crankshaft to no longer be secured in TDC position, and remove camshaft locking tools from the cylinder head. Turn the engine over twice in the direction of rotation until cylinder 1 intake and exhaust camshaft lobes face each other, secure the crankshaft in TDC position with BMW special tool 115180, and place BMW special tool set 113240 over camshafts to measure clearances, noting that due to VANOS unit tolerances, the intake side of the special tool may be up to 1 mm above the surface of the cylinder head, which is normal. Otherwise, reset camshaft timing. 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.

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