A valve refacer is a machine used
to restore the sealing surface of engine valves to their original condition.
Over time, the valve face can become worn, pitted, or misaligned, affecting
engine performance and efficiency. The valve refacer
is designed to grind or machine the valve face, providing a smooth and precise
sealing surface. Here's how a valve refacer typically
Valve Chucking: The engine valve to be refaced
is placed in a chuck, which securely holds the valve in place during the
grinding process. The chuck is adjustable to accommodate different valve sizes
Grinding Wheel Selection: The appropriate
grinding wheel is chosen based on the material and condition of the valve. The
grinding wheel must be compatible with the valve material and capable of
achieving the desired surface finish.
Valve Alignment: The valve refacer
aligns the valve face to the grinding wheel to ensure a uniform and even grinding
process. Proper alignment is crucial to achieving an accurate and flat sealing
Grinding Process: Once the valve is securely
chucked and properly aligned, the grinding wheel is brought into contact with
the valve face. The machine's motor drives the grinding wheel in a rotating
motion, while the operator guides the valve to maintain even contact with the
Material Removal: As the valve rotates against
the grinding wheel, material is gradually removed from the valve face. The
grinding action smoothens the surface, removing any pits, nicks, or
Cooling and Lubrication: To prevent overheating
and ensure an effective grinding process, a coolant or lubricant is often used.
This coolant or lubricant also helps flush away grinding debris and maintains a
consistent grinding temperature.
Checking Progress: The operator periodically
checks the progress of the grinding process to ensure that the desired surface
finish and dimensional accuracy are being achieved.
Finishing: Depending on the valve's condition
and the desired finish, the operator may use different grits of grinding wheels
or perform additional grinding passes to achieve the best result.
Final Inspection: Once the grinding process is
complete, the refaced valve is thoroughly inspected to ensure that it meets the
required specifications and standards.
The valve refacer is an essential
tool in engine rebuilding and maintenance, helping to restore worn or damaged
valves to their proper working condition, which can improve engine performance
and extend the valve's lifespan.