Car crank piston component AWTools AW18720BL – automotive replacement part, weight 100 g

AWTools AW18720BL is a car crank/piston component designed as an automotive replacement and maintenance tool for engine-related assemblies. The unit weighs approximately 100 g and combines a 3-arm self-centering mechanism with abrasive grit stones mounted in the jaws. It is intended for surface cleaning and light material removal inside brake cylinders, clutches and small engine cylinders, and is compatible with standard electric drills and three-jaw chucks.

Advantages

The component features three arms with jaws fitted with grit stones and hardened steel jaw bodies for improved strength and wear resistance. A flexible shaft provides self-centering action and easier access in confined spaces. Pressure of the abrasive stones against the cylinder surface is adjustable via a spring and knurled nut, enabling controlled material removal and consistent contact. The unit’s compatibility with standard drills and three-jaw chucks makes it suitable for workshop and field service use.

Suitable for

• Cleaning and deglazing car brake cylinders and clutch bores
• Light honing and surface preparation of motorcycle and small engine cylinders
• Maintenance of lawnmower and outboard engine cylinder bores
• Service and refurbishment of hydraulic cylinders and industrial engine bores
• Use with electric drills for rapid on-site cylinder cleaning

Key specifications

• Three-arm self-centering design with grit stones in jaws
• Jaws manufactured from hardened steel for durability
• Flexible shaft for maneuverability in tight or offset bores
• Adjustable stone pressure via spring and knurled nut
• Intended for use with standard or electric drills and three-jaw chucks
• Approximate weight: 100 g

How to use

Secure the component into a compatible three-jaw drill chuck and ensure the flexible shaft is properly seated. Insert the abrasive jaws into the cylinder bore and apply low-speed rotation to avoid overheating or excessive material removal. Adjust the contact pressure of the grit stones against the bore with the knurled nut until the desired contact is achieved, then perform even, controlled passes until the surface is cleaned or deglazed. Periodically inspect the stones and jaws for wear and remove debris from the bore to maintain consistent results.

Usage recommendations

Use appropriate personal protective equipment, including eye protection and gloves. For best results, apply light lubricant or cutting fluid during honing to reduce heat and capture debris. Avoid aggressive pressure or high speeds to prevent damage to the cylinder surface or premature wear of the abrasive stones. Replace worn stones or jaws to maintain safe and effective operation.