why does my Volkswagen Passat B8 (2015-2022) engine sound like it's knocking?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during the repair process.
• Gather a clean container to drain oil if necessary.

2. Change Engine Oil and Filter

• Sub-steps:
  1. Remove the oil drain plug and allow old oil to fully drain into the container.
  2. Replace the oil filter using an oil filter wrench. Ensure the old rubber gasket is removed before installing the new filter.
  3. Reinstall the drain plug and torque it to the manufacturer’s specifications (usually around 25 Nm).
  4. Fill the engine with the appropriate grade and type of oil (e.g., 5W-30 synthetic oil).
  5. Start the engine and let it run for a few minutes, checking for leaks.

3. Inspect and Replace Damaged Components

• Sub-steps:
  1. If the knocking noise persists, remove the timing cover to inspect the timing chain/belt and tensioners.
  2. Replace any worn or damaged components (timing chain/belt, tensioner) as needed, following manufacturer specifications for torque and alignment.
  3. Reassemble the timing cover and ensure all bolts are torqued to specifications.

4. Fluid Check and Replacement

• Sub-steps:
  1. Check coolant and other fluid levels, topping off or replacing as necessary.
  2. Inspect coolant for contamination, and if necessary, flush the cooling system and replace with manufacturer-recommended coolant.