What’s a piston ring compressor?

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A piston ring compressor is used to compress piston rings onto a piston for fitting into cylinder walls. There are two types: adjustable and non-adjustable. Piston rings create compression and must be pressed firmly into the cylinder walls. The compressor is lubricated for easy sliding. The piston is struck into the cylinder with a hammer or similar object, but care must be taken to avoid damage.

A piston ring compressor is a tool used to compress piston rings onto a piston to fit the piston within the cylinder walls. Typically manufactured with a spring steel or machined aluminum ring, the piston ring compressor is usually well lubricated to allow the piston and rings to slide through it with ease. There are two basic styles of supercharger: the adjustable type which can be made to fit many different sized pistons, and the non-adjustable type which are made to fit a specific application and different sized piston.

Piston rings are the components in an engine or piston-driven engine that actually contact the cylinder walls. Piston rings are also responsible for creating the compression required for a piston engine to operate. Made of a spring-like steel material, piston rings must be pressed firmly to fit inside the cylinder walls. Using a piston ring compressor, a mechanic is able to compress oversized piston rings so that the piston slides inside the cylinder wall. As the piston exits the supercharger, the piston rings expand from the piston ring grooves and press firmly against the engine cylinder walls.

When the piston rings are placed on the piston, the spaces at the ends of the piston rings are not matched so that they do not line up perfectly with each other. This creates higher cylinder compression resulting in increased cylinder horsepower. The cylinder wall is lubricated, as are the piston and piston rings, to allow the unit to slide freely within the cylinder once installed. The piston ring compressor is placed around the piston and tightened if applicable. The piston, connecting rod and piston rings are then pushed into the cylinder until the supercharger makes contact with the top of the cylinder block.

With the piston poised at the top of the cylinder and the ring press tool flush with the cylinder block, the piston is struck into the cylinder with the wooden handle of a hammer or similarly soft, but sturdy object. The piston should slide smoothly out of the compressor and into the cylinder. If a problem occurs, the piston is removed, checked and reinserted if it is in good condition. Occasionally, a ring will slip past the piston ring compressor and catch on the top edge of the cylinder. This can cause damage to the piston ring and in many cases forces the ring to be replaced to ensure that the engine runs without damage.




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