The BMW Part Hex Bolt 11211439395 is a crucial component in BMW vehicles, specifically designed for the crankshaft hub in N52 and N54 engines. This hex bolt ensures the secure attachment of the crankshaft pulley, which is essential for maintaining the engine’s timing and overall performance. Without this bolt, the crankshaft pulley could become loose, leading to potential engine damage and compromised performance.
It is often replaced during timing chain service to ensure the engine continues to run smoothly and reliably.
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Dimensions: 30mm length, 12mm hex head size
Material: High-grade steel alloy
Torque Specification: 60-70 Nm
Thread Pitch: M10 x 1.5
Fitment: Compatible with BMW N51, N52, N54 engines
Manufacturer: BMW
Part Number: 11211439395
Weight: 0.70 pounds
Warranty: BMW factory warranty
Applications: Fits various BMW models including 1 Series, 3 Series, X3, X5, Z4, and more from 2006-2016
BMW Part Hex Bolt 11211439395 is required for the following models and engines:
BMW 1 Series E82 / E88 (2008-2013): 128i, 135i
BMW 1 Series M (2011-2012): 1M
BMW 3 Series E90 / E91 / E92 / E93 (2006-2013): 323i, 325i, 325xi, 328i, 335is
BMW N54 Engine
Prepare the vehicle: Ensure the vehicle is parked on a flat surface and the engine is turned off. Disconnect the battery to prevent any electrical accidents.
Remove the necessary components: Depending on your vehicle model, you may need to remove the engine cover, timing chain cover, or other components to access the crankshaft hub.
Locate the old hex bolt: Find the hex bolt (part number 11211439395) on the crankshaft hub. It is usually located at the center of the hub.
Remove the old hex bolt: Use an appropriate-sized socket wrench to loosen and remove the old hex bolt.
Be careful not to damage the surrounding components.
Clean the area: Clean the area around the bolt hole to ensure there is no debris or dirt that could affect the installation of the new bolt.
Install the new hex bolt: Place the new hex bolt (part number 11211439395) into the bolt hole. Make sure it is properly aligned.
Tighten the bolt: Use the socket wrench to tighten the new hex bolt. Follow the torque specifications provided by BMW for your specific vehicle model.
It is usually around 90 Nm.
Reassemble the components: Reinstall any components that were removed earlier, such as the timing chain cover or engine cover.
Reconnect the battery: Reconnect the vehicle’s battery and ensure everything is properly secured.
Test the installation: Start the engine and check for any unusual noises or vibrations. Ensure the bolt is securely tightened and there are no issues with the crankshaft hub.
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To maintain the BMW Part Hex Bolt 11211439395, ensure regular inspections during routine maintenance checks. Check for any signs of wear, corrosion, or damage. Ensure proper torque specifications are followed during installation to avoid over-tightening or under-tightening.
The hex bolt should be replaced every time it is removed, as it is a torque-to-yield bolt.
This is particularly necessary during any timing chain service. Always use genuine BMW parts to ensure compatibility and reliability.
The BMW Part Hex Bolt 11211439395 is a crucial component for securing the crankshaft pulley on N52 and N54 engines, ensuring engine timing and performance. It should be replaced during timing chain service to maintain smooth operation.
Key dimensions include a 30mm length and 12mm hex head size, made from high-grade steel alloy with a torque specification of 60-70 Nm.
The bolt is compatible with BMW N51, N52, and N54 engines and fits various models including the 1 Series, 3 Series, X3, X5, Z4, and more from 2006-2016.
Regular inspections are necessary to check for wear, corrosion, or damage, and it should be replaced every time it is removed due to its torque-to-yield design.
