21mm Valve Chuck Assembly SVSIID

Kwik-Way 21mm Valve Chuck Assembly - Large Capacity Precision for Valve Refacers

The 21mm Valve Chuck Assembly is an optional, large-capacity component from Kwik-Way, designed to enhance the versatility and precision of SVS II Deluxe, EVS, and VL (SN 3680+) Valve Refacers. This assembly accommodates valve stems from 7/16” to 13/16” (11.11 mm to 20.6 mm). As a core part of the Kwik-Way “Centerline System,” its air-activated, self-aligning six-ball design ensures valves are refaced concentric to their true center with exceptional accuracy (down to .0005 inches). Installation requires the 012-1035-21 Chuck Yoke, and proper maintenance with denatured alcohol for cleaning and Automatic Transmission Fluid for lubrication is crucial for optimal performance.

Kwik-Way 21mm Valve Chuck Assembly - Expanding Capacity and Precision for Valve Refacers

The 21mm Valve Chuck Assembly is an advanced, optional component designed by Kwik-Way to significantly expand the capacity and maintain the renowned precision of their valve refacing machines. It is a vital upgrade for specific models, ensuring a wider range of valve stems can be processed with Kwik-Way’s signature accuracy.

Key Features and Broad Compatibility:

• Expanded Capacity: This chuck assembly is specifically designed to accommodate larger valve stems, with a diameter range of 7/16” to 13/16” (11.11 mm to 20.6 mm). This makes it a crucial “large chuck option” for workshops dealing with a variety of engine types.
• Targeted Compatibility: While primarily intended for Kwik-Way SVS II Deluxe Valve Refacers, it is also compatible with EVS and VL models with serial numbers 3680 and above, ensuring a broad application across a segment of Kwik-Way’s machine lineup.
• Installation Requirements: Installation of this 21mm chuck requires the dedicated 012-1035-21 Chuck Yoke. For machines already in the field, modification to the chuck cover might also be necessary to properly fit the new chuck and yoke.

At the Heart of the Kwik-Way “Centerline System”:

This chuck assembly embodies the fundamental design principles of the Kwik-Way “Centerline System,” ensuring unparalleled accuracy and operational efficiency:

• Six-Ball Chuck Design: The chuck ingeniously employs two sets of three hardened steel balls, positioned strategically at the front and rear. These balls precisely grasp the portion of the valve stem that travels within the valve guide, establishing the true centerline.
• Self-Alignment and Concentricity: The air-activated, self-aligning design automatically ensures that the valve stem is perfectly centered. This allows the valve face to be refaced concentric to its true center, even for warped valves, by restoring the valve face’s concentricity with the stem portion that operates within the guide.
• Exceptional Precision: This system eliminates the need for prior stem chamfering or butt grinding of the valve, simplifying the process while maintaining high accuracy. It consistently provides a runout of .0005 inches (0.0127 mm) or less with a standard chuck, with the potential for even greater precision—down to .0002 inches (0.00508 mm) or less—when utilized with the optional High Performance Chuck.
• Operational Efficiency: The air-activated chuck offers quick opening and closing, enabling operators to work through a wide range of valve sizes efficiently without the need to stop and manually change collets.

Crucial Maintenance Recommendations:

To ensure the longevity and optimal precision performance of this chuck assembly, adherence to Kwik-Way’s maintenance guidelines is paramount:

• Maintain Cleanliness: It is absolutely crucial to keep the chuck consistently clean and free of any debris. Accumulations can lead to excessive runout or sticky operation, compromising accuracy.
• Recommended Cleaning Agent: For thorough cleaning of chuck components, denatured alcohol is the recommended solvent.
• Exclusive Lubrication: For lubrication of the chuck balls and collars, Automatic Transmission Fluid (ATF) should be used exclusively.
• Avoid Harmful Chemicals: Never use cleaning chemicals that can leave a film or residue, such as WD-40, brake cleaner, or other penetrating oils. These can negatively affect the chuck’s critical accuracy and performance over time.
• Protection from Debris: When the machine is not in use, especially during grinding wheel dressing operations, the chuck should always be covered to prevent grinding dust and other debris from entering the sensitive chuck ball and collar area.
• Careful Handling of Balls: During chuck disassembly for cleaning, the small steel chuck balls may fall out. Exercise extreme care and ensure they are carefully reinstalled in their correct positions.