Camshaft explained

Question

A camshaft is a rotating shaft inside your engine that controls the opening and closing of the intake and exhaust valves. It plays a crucial role in timing the flow of air-fuel mixture into the combustion chamber and the release of exhaust gases out of the engine.

How It Works

The camshaft has lobes (or cams) — egg-shaped protrusions — that push against:

• Rocker arms or cam followers (in pushrod engines), or

• Directly onto valves (in overhead camshaft engines, like in the Ford Ranger T6).

As the camshaft rotates:

• The cam lobes push the valves open.

• Valve springs then pull them closed when the lobe rotates away.

This process is synchronized with the crankshaft using a timing chain or timing belt.

 

Camshaft Controls Two Types of Valves

 

Types of Camshaft Configurations

 

Signs of Camshaft Problems

 

Maintenance Tips

• Use high-quality oil and change it regularly to prevent cam lobe wear.

• Don’t ignore valve noise or cold-start ticking.

• If replacing the timing chain, inspect camshaft components as well.