Bearings and Valves
- Main Bearings
- Conrod Bearings
- Thrust Bearings
- Camshaft Bearings/ Bushes
- Intake/Inlet Valves
- Exhaust/Outlet Valves
- Valve Seats/Inserts
- Valve Guides
- Valve Pushrods/Tappets
- Valve Springs
- Valve Cotters/Collets
The engine bearings mainly consist of main bearings, conrod bearings, thrust bearings and camshaft bearings. Engine Bearing is a device supporting a mechanical element and providing its movement relative to another element with minimum power loss.
The function of Engine Bearings:
- Main bearings which are mounted in the crankcase support crankshaft which provides its rotation under inertia forces generated by the parts of the shaft and oscillating forces transmitted by the connecting rods. The main bearing consists of two parts: upper and lower. The upper part of the main bearing commonly has an oil groove on the inner surface. The main bearing has a hole for passing oil to the feed holes in the crankshaft. Some of the main bearings may have thrust bearing elements supporting axial loads and preventing movements along the crankshaft axis.
- Conrod bearings provide the rotating motion of the crankpin within the connecting rod, which transmits cycling loads applied to the piston. Connecting rod bearings are mounted on the big end of the connecting rod. A bearing consists of two parts (commonly interchangeable).
- Camshaft Bearings support the camshaft and provide its rotation.
Engine valves are located in the cylinder head. There are two types of engine valves; intake and exhaust valves. The intake valves of course let air in, and the exhaust valves let exhaust air out. The more air you can move in and out of the engine, the more efficient power the engine will have. This is why the engine valve plays a pretty critical role in engine performance.