They usually wear out because of other engine functions, not those of the bearing itself, which makes it impossible to predict how long they'll last or when they'll fail. Under ideal conditions, they'd last indefinitely. However, they're usually made of copper and lead compounds, which are subject to a variety of weaknesses.
Do crankshafts need to be replaced?
If a crankshaft or a piston within the crankshaft is not working properly, it means you will have to do an expensive repair in the form of an engine repair or replacement. The flywheel is the heavy metal disk that is installed on the rear end of the crankshaft, and translates stored rotational energy into the engine.
Do crankshafts go bad?
Because the crankshaft is such an integral part of your engine, a bad crankshaft will usually be noticed immediately. Some of the underlying causes of a bad crankshaft are: A forging or casting flaw. Insufficient lubrication.
How long do engine bearings last?
Bearings should last eight to 12 years when properly maintained. The L10 life is a representation of bearing lifespans.
Related Question How long does a crankshaft last?
How often do pistons need to be replaced?
Piston replacement intervals are typically outlined in your machine's factory service manual. Using dirt bikes as an example, many manufacturers outline a piston and ring replacement schedule of every six races or 15-30 hours for a four-stroke, depending on the machine.