Which component is used to scavenge oil in a dry-sump system?

• A. Reservoir
• B. Scavenge pump
• C. Oil cooler
• D. Filter

Answer: (B)

In a dry-sump lubrication system, oil is stored in a separate reservoir and circulated by two main types of pumps: a pressure pump that sends oil to the bearings, and scavenger pumps that remove oil from the crankcase and return it to the reservoir. The job of scavenging is to collect oil that drains to the crankcase and push it back to the oil tank, keeping the crankcase clear of excessive oil and preventing aeration or starvation of the oil supply.

So the component that performs this returning-and-removing function is the scavenging pump. The reservoir simply stores oil, the oil cooler lowers oil temperature, and the filter cleans the oil; none of those move oil from the crankcase back to the reservoir.