With a machinery lubricating oil analysis...

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Question 1 of 205eccefa2bacbc34ba4d477e6

With a machinery lubricating oil analysis program, it is important to monitor trends over time. What would be indicated by elevated copper levels associated with a recent sample of used diesel engine crankcase lubricating oil?

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🔍 Key Concepts

• Relationship between metal wear particles in lube oil and the metals used in different bearing alloys • Common bearing material compositions in diesel engine crankshafts and connecting rods • How oil analysis trend data links a specific metal (like copper, lead, aluminum, tin) to a particular component

💭 Think About

• Which engine components are actually made with significant amounts of copper or copper-based alloys? • Among aluminum-alloy, lead-bronze, and white metal bearings, which one would you expect to release copper into the oil if it wears? • If copper is elevated, what other metals (like lead or tin) might also rise with wear of certain bearing types, and how does that help you narrow the choice?

✅ Before You Answer

• Verify which bearing type listed is typically a copper-based (bronze) alloy • Check that aluminum-alloy bearings would not be a primary source of copper particles • Confirm that white metal (Babbitt) bearings are usually based on tin/lead rather than copper, and match that to the oil analysis clue

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