Original BMW Crankshaft Timing Chain Sprocket for N20/N26 BMW 2, 3, 4, 5 Series, X1, X3, X4, X5, and Z4 (2012–2018)

Original BMW part 11-31-7-603-944 is the crankshaft timing chain sprocket that drives the timing chain on the N20 and N26 four-cylinder turbo engines used in the 2012–2018 BMW 2, 3, 4, and 5 Series, X1, X3, X4, X5, and Z4. BMW files it in the engine timing chain group as a plain sprocket, and it is the lower gear of the chain drive that turns both camshafts. The part weighs 63 g, and BMW shows production starting in March 2011. It is made in Germany and sold as a single piece. A crankshaft sprocket rides on the nose of the crankshaft and sets the pace for the whole timing drive, so its tooth profile has to match the chain exactly.

Original BMW Parts carry a 24-month parts warranty.

The N20 and N26 timing drive uses one crankshaft sprocket and two camshaft sprockets, and this part is the crankshaft gear only. The two camshaft sprockets carry separate numbers, 11-36-7-583-818 and 11-36-7-583-819, so do not order this sprocket expecting it to fit a camshaft. On BMW's timing diagram it sits with the engine timing chain 11-31-7-516-074, the chain guides 11-31-7-592-877 and 11-31-7-592-850, the chain tensioner 11-31-7-567-680 with its gasket 11-31-7-631-972, and the camshaft adjuster sensor wheel 11-36-7-598-215.

Technical Details

• Manufacturer: BMW, Original BMW part
• Part number: 11-31-7-603-944
• BMW part name: sprocket, engine timing chain group (crankshaft position)
• Engines: N20 and N26 four-cylinder
• Weight: 63 g (0.1 lb)
• Production start: March 2011
• Country of manufacture: Germany
• Sold individually, one piece
• Warranty: 24 months on Original BMW Parts

Common Questions

Is this the camshaft sprocket or the crankshaft sprocket?
It is the crankshaft sprocket. The camshaft sprockets for these engines use part numbers 11-36-7-583-818 and 11-36-7-583-819.

Does it fit both the N20 and the N26?
Yes. BMW applies this sprocket to both engines in the 228i, 328i, and 428i, as well as the N20 in the other models shown.

Where is this part made?
This sprocket is made in Germany.

Fitment & Compatibility

Compare your production year and trim against the table below. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.