Understanding Engine Bearing Terminology

Understanding Engine Bearing Terminology
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Understanding Engine Bearing Terminology

Engine bearings play a crucial role in ensuring smooth operation and longevity of your engine. Whether you're an engine builder, a DIY enthusiast, or just curious about what's under the hood, understanding the terminology associated with main bearings & rod bearings can be incredibly beneficial. Let's explore the key terms related to three main types of engine bearings: Straight Shell Bearings, Thrust Washers, and Flange Bearings:

Straight Shell Bearing

Straight Shell Bearings are essential components in many types of engines. They provide a smooth, low-friction surface for rotating components, ensuring efficient and reliable operation.

1. Locating Lug

2. Bearing Length

3. Oil Hole

4. Width of Locating Lug

5. Free Spread

6. Bearing Back

7. Bearing Wall Thickness

8. Bearing Surface

9. Crush Relief


Thrust Washer

Thrust Washers are designed to handle axial loads, preventing the crankshaft from moving forward or backward.

10. Oil Groove

11. Wall Thickness

12. Locking Lug

13. Thrust Surface


Flange Bearing

Flange Bearings are used in applications where both radial and axial loads are present. They feature a flange that helps in positioning and securing the bearing.

14. Thrust Surface Relief

15. Distance Between Flanges

16. Oil Groove

17. Flange Thickness

18. Crush Relief

19. Flange Diameter

20. Flange Bearing Length

21. Oil Hole

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