🔍 Key Concepts

• Direct-cylinder admission air starting systems and how starting valves operate • What happens inside a cylinder if high-pressure starting air leaks past a starting valve during normal engine operation • Typical symptoms of local overheating vs. combustion-related problems

💭 Think About

• Ask yourself: if high‑pressure starting air leaks into a firing cylinder, will that mainly affect temperature of the external piping, the combustion process inside the cylinder, or the exhaust system? • Think about when the air starting system is pressurized: what part of the system would show a continuous temperature rise if air were flowing when it shouldn’t? • Which options describe long‑term combustion deposits, and which describe an immediate mechanical/thermal symptom tied directly to the air starting line?

✅ Before You Answer

• Identify which choice is directly related to the starting air line and valve location, not to general combustion quality • Separate long-term effects (like deposits from poor combustion) from short-term, localized overheating effects • Consider which component would be exposed to continuous high‑pressure air flow if a starting air valve does not close fully