Valve guides are hollow cylinders that are completely concentric and made of special iron or bronze alloys. They are located inside the cylinder head of the engine and guide the longitudinal displacement of the valve.

Benefits of RIO Valve Guides

• Excellence in materials and high precision machining ensures high wear resistance and dimensional accuracy and concentricity at the level of 0.02 mm.
• Oversizes up to 1 millimeter: greater use of the cylinder heads’ life spam
• Finished internal diameter: reduces rework and generates precision gains.
• Four types of materials for applications according to the engine requirement: bronze, phosphor bronze, cast iron with phosphorus and special tempered alloys.
• Phosphorus in the composition: an important element for increasing the friction resistance.
• Product mix: there are over 1,000 different formats for the engines of the biggest automakers in the world.
• Manufacture of special parts for high performance engines.

The valve seats are nothing more than rings on the cylinder head that serve as a “bed” for the base of the valves (exhaust or intake), sealing the compression or explosion inside the combustion chamber.

Benefits of RIO valve seats:

• Largest portfolio in the market
• Oversizes up to 2 millimeters: greater use of the life span of cylinder heads
• Four types of materials for applications according to the engine requirement: cast iron, tempered cast iron, tempered steel and super alloyed steel.
• As these products are subjected to high temperature wear stresses, high chromium and nickel steels, cast irons alloyed with molybdenum and chromium or nickel and cobalt based alloys are applied according to the engine’s requirements.
• Special parts both in material and dimension.
• Mix of products distributed to the engines of the biggest automakers in the world.

The main function of the cylinder liners is to seal the combustion chamber, allowing the thermal exchange of heat throughout the block. Its use allows the reuse of the block, maintaining its useful life.

Benefits of RIO cylinder liners

• Internal finishing of the wet liners according to manufacturer’s standards (pre-softening).
• Over metal of dry liners in 0.80 mm in the internal diameter.
• Dimensional standardization of the parts that make up the package: guarantee of reduced rework.
• Rough Bushings for adaptation/ recovery of liners in blocks.
• Oversize up to 4mm.
• Standard hardness.
• Alternatives for high performance engines.
• One of the largest mixes of the market
• Special alloys with resistance to wear and corrosion.
• Innovative packaging for the wet liners: guarantee of integrity until delivery to the final customer.

The valve tappets act as an intermediary element between the eccentric of the camshaft (cam) and the valve control, performing the synchronism of opening and closing the valves.

Benefits of RIO valve tappets

• The material of the tappets developed by RIO for the spare parts market are compatible with iron or steel camshafts.
• Chilling process ensures greater resistance in contact with the valve camshaft.
• Heat treatment.
• Oversizes