Engine: Refrigeration AC

1. A dirt and foreign particles from coming in contact with the highly polished sealing surfaces
2. B any lubricant from contacting the carbon surface that would cause the expulsion of the saturated Teflon film
3. C any lubricant from contacting the stationary seal face that would cause etching of the face surface
4. D the spring from being damaged by the corrosive effects of excessive handling

Tip: press A-D to answer