Caution / Notice / Hint
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
- The exhaust valve is encapsulated with metallic sodium. The metallic sodium is a strong alkaline and prone to cause a serious chemical reaction. Therefore, extra caution is required when handling or disposing the exhaust valve.
- Never disassemble the exhaust valve. The metallic sodium may cause blindness if it gets into your eyes, or cause burn injuries or chemical reactions resulting in fire if it comes into contact with your skin or any heat source.
- Make sure to wear safety glasses and protective gloves when removing a damaged exhaust valve.
- Do not intentionally damage the exhaust valve to remove the metallic sodium.
NOTE:
- If it is clearly stated that the industrial waste disposal method is not pressing but dissolution, ask the industrial waste disposal operator to dispose of the valve. If the exhaust valve is damaged, remove the exhaust valve, perform the following neutralization process, and then dispose of it according to the same procedures that are provided for other parts.
- This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.
Refer to PRECAUTION [12/2019 - 11/2023] , or refer to PRECAUTION [11/2023 - ]
HINT:
- The sodium inside the exhaust valve is safe as long as it remains sealed inside the exhaust valve.
- Exhaust valves filled with sodium can be identified by their "NA" identification mark.
- For removal of the exhaust valve.
Refer to DISASSEMBLY [10/2022 - 11/2023] , or refer to DISASSEMBLY [11/2023 - ]
- For disposal of the exhaust valve.
See step 10 [10/2022 - 11/2023], or see step 10 [11/2023 - ]