🔍 Key Concepts

• Crankcase explosion risk after severe overheating or piston seizure • Purpose and design of crankcase inspection covers vs. explosion relief doors • Safe sequence of actions before opening any crankcase access after abnormal overheating

💭 Think About

• What happens inside the crankcase when oil and deposits are exposed to very high temperatures and hot spots remain after shutdown? • Which devices on the crankcase are specifically designed to relieve pressure safely, and which are NOT intended to be opened while hot? • Why might adding more ventilation or opening covers too early actually increase the risk of explosion or fire rather than reduce it?

✅ Before You Answer

• Verify which components are designed as automatic safety devices (spring‑loaded / weighted relief doors) versus manual access covers • Check standard practice: after a suspected crankcase fire or hot spot, should personnel be near or opening the crankcase before it has cooled and been checked? • Confirm whether continuing or increasing air flow into a hot crankcase is recommended immediately after a seizure, or if isolation and cooling time are emphasized first