What is the temperature indicating crayon (Tempilstik) used on?

• A. Journal Bearing Housing
• B. Wheel tread
• C. Brake shoe lining
• D. Engine cylinder

Answer: (A)

Tempilstik is a temperature-indicating crayon used to verify bearing heat, specifically applied to the journal bearing housing. The critical spot to monitor for overheating is where the bearing sits and transfers heat to the housing, so placing the Tempilstik on the journal bearing housing lets you see if the bearing temperature reaches an unsafe level during operation. If the color change shows the target temperature has been reached, you know the bearing is running hot and may need inspection or lubrication adjustments. This tool isn’t used on wheel tread, brake shoe lining, or engine cylinder because those locations aren’t where journal bearing overheating is assessed with a Tempilstik, and other methods are used there for temperature or condition checks.