The highest loads applied to the diesel...

🔍 Key Concepts

• Relationship between combustion (firing) pressure and forces transmitted through the piston, connecting rod, and crankshaft • Difference between steady loads (like rotating/centripetal forces) and peak cyclic loads in a diesel engine • How main bearings support the crankshaft and what kind of force passes through them during each power stroke

💭 Think About

• When the fuel burns in the cylinder, what direction is the resulting force, and how does it travel down to the crankshaft main bearings? • Between inertia, centripetal, axial, and firing forces, which one changes most sharply in magnitude during each power stroke? • Think about when a main bearing is most stressed: is it during simple rotation, or during the moment of maximum cylinder pressure?

✅ Before You Answer

• Be clear on what axial load means versus a radial load on the main bearing • Consider which load is directly caused by combustion pressure rather than by motion or rotation of parts • Ask: which of these loads would create the highest peak force on the crankshaft main bearings during normal engine operation?

The highest loads applied to the diesel engine crankshaft main bearings are __________.

axial loads

firing loads

inertia loads

centripetal loads