my Toyota Corolla E170 (2013-2019) is leaking oil, what could it be

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Address the Oil Filter

• Tools Required: Oil filter wrench, oil catch pan.
• Instructions:
  1. Place an oil catch pan under the oil filter.
  2. Use the oil filter wrench to remove the oil filter.
  3. Inspect the rubber O-ring on the old filter; replace it if damaged.
  4. Apply a thin layer of fresh oil to the new filter O-ring.
  5. Install the new oil filter, hand-tightening it securely.

3. Replace Valve Cover Gasket

• Tools Required: Socket set, torque wrench, gasket scraper, engine oil.
• Instructions:
  1. Remove the engine cover if applicable.
  2. Disconnect any electrical connectors or hoses that obstruct access to the valve cover.
  3. Remove the bolts securing the valve cover using a socket set.
  4. Carefully lift the valve cover off, ensuring no debris falls into the engine.
  5. Remove the old gasket using a gasket scraper, ensuring the surface is clean and free of old material.
  6. Place the new gasket in the valve cover and reattach the cover, tightening the bolts to the manufacturer’s specified torque.

4. Inspect and Replace Oil Pan Gasket

• Tools Required: Socket set, torque wrench, gasket scraper, oil catch pan.
• Instructions:
  1. Drain the engine oil using an oil catch pan.
  2. Remove the bolts securing the oil pan to the engine block using a socket set.
  3. Carefully detach the oil pan and remove the old gasket.
  4. Clean the oil pan mating surface on both the pan and engine block.
  5. Install the new gasket on the oil pan and reattach it, tightening the bolts to specifications.

5. Check and Replace Crankshaft Seals

• Tools Required: Seal puller, socket set, torque wrench.
• Instructions:
  1. Drain the engine oil and remove any components obstructing access to the crankshaft seals.
  2. Use a seal puller to carefully remove the old seals.
  3. Lubricate the new seals with a bit of oil and press them into place.
  4. Reassemble any components that were removed.