🔍 Key Concepts

• Full-flow lube oil system arrangement and purpose of a bypass (relief) valve • What happens to pressure before and after a filter when the filter becomes restricted • Difference between pressure, flow, and temperature effects in a lubrication system

💭 Think About

• In a full-flow system, what path does the oil normally take from the pump to the bearings, and where is the bypass valve installed relative to the filter? • Under what condition does the pressure on the inlet side of the filter rise sharply compared to the outlet side, and why would that make a spring-loaded valve open? • Which of the answer choices would most directly cause a sudden increase in pressure across the filter housing, rather than just changing the oil’s properties?

✅ Before You Answer

• Identify what the bypass relief valve is protecting (the filter element, the system, or both) • Decide which option would create a dangerous pressure differential across the filter in a full-flow system • Eliminate choices that mainly affect temperature or overall system flow without specifically over-pressurizing the filter housing