What marks do you take the core into the cover?

• A. -40 to 131 deg
• B. -20 to 100 deg
• C. 0 to 100 deg
• D. -40 to 0 deg

Answer: (A)

When you’re deciding how to mark the core as it goes into the cover, you’re looking at the safe operating temperature range for that assembly. The marks represent the temperatures within which the core-to-cover fit, seals, lubricants, and material tolerances are guaranteed to work without binding, leaking, or suffering damage.

The broad range from -40 to 131 degrees covers both extreme cold and hot conditions you might encounter in service. This ensures you can assemble and operate the core into the cover reliably whether you’re in a cold environment or a hot one, without stepping outside the tolerances that could cause issues. Narrower ranges that exclude either the low end or the high end would risk problems in real-world conditions—think of temperature swings at sea or in engine rooms—and could lead to tight fits, seals failing, or other performance problems.

So, the widest permissible range is the best choice because it accounts for the full spectrum of operating environments you may face, keeping the assembly within spec across temperature extremes.