Textbook Problem

Which of the following statements is not true about thermal cleaning?

1. The main advantage of thermal cleaning is a total reduction of all oils and grease on and in blocks, heads, and other parts.

After a part has been thermally cleaned, it should be submerged in water to cool it quickly.

Thermal cleaning leaves behind a dry, powdery ash on the parts.

After a part has been thermally cleaned, it should be washed or blasted with shot