🔍 Key Concepts

• secured engine (not running) and what systems are still pressurized or filled when stopped • how jacket water / cooling water can enter a cylinder (liner cracks, head gasket issues, etc.) • difference between raw water (sea water side) and soft/jacket water (fresh water cooling side)

💭 Think About

• Ask yourself: if the engine is secured and not turning, what source of water is still present that could slowly leak into just one cylinder? • Think about which choice describes a defect that would allow cooling water to cross from the cooling space into the combustion space of a single cylinder. • Which options describe operating-condition problems (speed, circulation, temperature control) rather than a direct leakage path into the cylinder?

✅ Before You Answer

• Identify which component is in direct contact with cooling water on one side and cylinder/combustion space on the other. • Eliminate any choice that would mainly affect temperature control but not create a physical leak path. • Eliminate any choice that depends on engine speed just before shutdown, since the symptom appears while the engine is secured and sitting idle.