how to check the timing chain on my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Tools Required: Socket set, torque wrench, OBD-II scanner, engine oil, cleaning cloths.
• Safety Warnings: Disconnect the battery before beginning work to prevent electrical shorts.

2. Oil and Visual Inspection

• Sub-steps:
  1. Open the hood and locate the engine oil dipstick. Pull it out and wipe it clean, then reinsert and remove it again to check the oil level.
  2. If the oil level is low, add the specified engine oil type recommended in the owner’s manual.
  3. Inspect the engine for any visible oil leaks around the timing chain cover.
  4. Check the oil condition; if it appears dirty or contaminated, consider an oil change.

3. Remove Valve Cover

• Sub-steps:
  1. Use a socket set to remove the bolts securing the valve cover.
  2. Gently lift the valve cover off, ensuring not to damage any gaskets or seals.
  3. Clean the mating surfaces of the valve cover and engine block with a cleaning cloth.

4. Inspect Timing Chain and Tensioner

• Sub-steps:
  1. Visually inspect the timing chain for signs of wear, such as stretching or fraying.
  2. Check the timing chain tensioner for proper operation and any signs of oil leaks.
  3. Manually rotate the engine using a socket on the crankshaft pulley to observe the timing chain movement.
  4. If the chain is loose or the tensioner is faulty, it may need replacement.

5. Reassemble Components

• Sub-steps:
  1. Replace the valve cover gasket if it shows signs of wear or damage.
  2. Reinstall the valve cover, tightening the bolts to the manufacturer’s specified torque.
  3. Reconnect the battery.