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A crankcase is a housing for the crankshaft in an internal combustion engine. It is typically made of metal and seals the bottom of the engine block, protecting the crankshaft and other internal components from dirt, debris, and other potentially damaging materials.

The primary functions of a crankcase are:

1. *Protection*: It shields the crankshaft and other components from external dirt, debris, and damage.

2. *Oil Containment*: The crankcase contains engine oil, which is crucial for lubricating the crankshaft and other engine parts.

3. *Gas Recirculation*: Some modern engines recirculate gases that blow by the piston rings back into the combustion process (a system called "positive crankcase ventilation" or PCV) to improve emissions.

Uses and applications of crankcases:

1. *Automotive Industry*: Every car, truck, motorcycle, or any vehicle that uses an internal combustion engine has a crankcase.

2. *Maritime Industry*: Similar to vehicles, ships with internal combustion engines have crankcases.

3. *Aerospace Industry*: Aircraft with piston engines also have crankcases.

4. *Industrial and Agricultural Machinery*: Engines in machinery such as tractors, generators, and industrial machines have crankcases.

5. *Power Equipment*: Smaller tools and equipment such as lawnmowers, chainsaws, and generators also have crankcases.

In all these applications, the crankcase provides the same essential functions of protecting engine components, containing oil, and sometimes facilitating the recirculation of gases.


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