🔍 Key Concepts

• Diesel combustion quality and how incomplete burning affects residues in the cylinder • Role of piston ring belt and why deposits tend to collect there • How lubricating oil and temperature influence carbon formation and coking

💭 Think About

• Think about what creates solid carbon: does it come mainly from fuel, lube oil, temperature effects, or a combination? • For each option, ask: could this realistically leave unburned material or cause oil to carbonize in the ring area? • Consider whether only one factor is usually responsible, or whether several common engine problems can contribute to the same deposit issue.

✅ Before You Answer

• For each choice, decide if it can lead to incomplete combustion or oil coking near the rings • Verify how high ring temperatures affect both fuel residues and lubricating oil (do they burn cleanly or carbonize?) • Check whether too much cylinder oil can reach the ring belt and what happens to that oil under combustion heat.