Tempo indicating crayon is used to mark temperature on which component?

• A. Journal Bearing Housing
• B. Wheel Assembly
• C. Brake Rigging
• D. Cylinders

Answer: (A)

The tempo indicating crayon is used on the journal bearing housing because that’s where bearing heat most clearly shows up during operation, and it’s a surface you can easily inspect visually. By applying a tempo mark on the journal bearing housing, maintenance staff can compare the mark before and after a run to see if the bearing’s temperature has risen beyond acceptable limits. If the bearing overheats, the mark’s appearance can change (for example, it may fade, smear, or alter color), signaling a lubrication or bearing issue that needs attention. Other parts like the wheel assembly, brake rigging, or cylinders aren’t the standard targets for this temperature-indication method in NORAC checks, since they’re not as straightforward to monitor at a glance with a simple tempo mark.