why does my Toyota Highlander XU70 (2020-Present) engine make a ticking noise

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, oil filter wrench, torque wrench, mechanic's stethoscope, and engine oil.
• Disconnect the battery to ensure safety while working on the engine.

2. Oil Change

• a. Drain Engine Oil
  • Place an oil drain pan under the oil pan.
  • Remove the oil drain plug using a socket wrench and allow the oil to drain completely.
• b. Replace Oil Filter
  • Use an oil filter wrench to remove the old oil filter.
  • Apply a small amount of new oil to the rubber seal of the new filter and install it.
• c. Refill Engine Oil
  • Reinstall the drain plug and tighten it to the manufacturer’s specified torque (typically around 25-30 ft-lbs).
  • Pour the recommended amount and type of new oil into the engine (check the owner’s manual for specifications).

3. Valve Adjustment (if necessary)

• a. Remove Engine Cover
  • Unscrew and remove any bolts securing the engine cover.
• b. Inspect Valve Clearance
  • Use a feeler gauge to check the clearance of each valve according to manufacturer specifications.
  • Adjust the clearance as necessary by replacing shims or adjusting rocker arms, following the service manual's specifications.

4. Inspect Timing Chain/Belt

• a. Remove Timing Cover
  • Remove any components obstructing access to the timing cover (e.g., belts, pulleys).
  • Unbolt and remove the timing cover.
• b. Inspect Components
  • Check the timing chain or belt for wear, tension, and alignment. Replace if necessary based on visual inspection or if there are abnormal sounds.