The cam pulley controls the camshaft’s rotational speed, which opens and closes the cylinders. It is checked during timing belt replacement and can be replaced in high-performance vehicles. Adjustable pulleys and dual camshafts are used to adjust timing. During a timing belt change, the mechanic must ensure correct alignment. Aftermarket parts may void the warranty.
A cam pulley is part of the timing system in an engine used to control the rotational speed of the camshaft, the component that controls the poppet valves responsible for drawing air into and out of the cylinders. The cam pulley articulates with the timing chain to rotate the camshaft in sync with the crankshaft. This vehicle component is typically checked during timing belt replacement to determine if it needs repair or replacement, and can be replaced in high-performance vehicles that see significant engine wear.
The camshaft controls the opening and closing of the cylinders. Operating speed determines the best engine timing, and automakers use a variety of tools to control timing so that a car runs optimally across a range of speeds. Some cars are tuned for high performance and can be rough at low speeds because the valves are open longer, while others have trouble running at high speeds because intake needs aren’t met.
An adjustable cam pulley creates more maneuvering space and can be seen on some performance cars with very high demands. Other cars use options such as dual camshafts to adjust the timing as the driver accelerates and the engine timing must change to compensate for the increase in speed. Adjustable pulleys are available as a replacement for some vehicle modifications, and some cars may come with them by default from the manufacturer or by special order from a customer.
During a timing belt change, it is important to make sure the cam pulley is adjusted correctly. It usually has marks to line up with the other engine components. When the mechanic removes the old timing belt or chain and puts in the new one, he can line up the marks to ensure the engine is timed correctly. This also provides the ability to check for wear and other issues that could damage the engine or interfere with timing.
Manufacturers provide a range of cam pulley options for their vehicles. It may be possible to use an aftermarket part rather than one made by the manufacturer. This option may be preferable for mechanics looking to cut costs or install special modifications that are not available from the automaker. Drivers should be aware that such parts may void the warranty, and if a problem occurs, the dealer may not be able to fix it.
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