Motion Pro Digital Leak Down Tester | Model 57-8740 | Engine Cylinder Diagnostic Tool

The Motion Pro Digital Leak Down Tester (Model 57-8740) is a professional-grade engine diagnostic tool built to accurately measure cylinder leakage — helping mechanics and enthusiasts quickly identify worn rings, blown head gaskets, and faulty intake or exhaust valves.

Featuring a precision digital display, built-in pressure regulator, and a rugged rubber-protected gauge housing, this tester delivers reliable results in demanding shop environments. It meets FAA leak down test specifications, making it suitable for both automotive and aviation engine diagnostics.

Compatible with cylinders under 5.00" bore diameter and spark plug threads of 10 mm, 12 mm, and 14 mm. Requires a 90 PSI air source.

Key Features

• Displays total leakage percentage past rings, head gasket, intake & exhaust valves
• Precision digital display for accurate, easy-to-read results
• Built-in pressure regulator for consistent 80 PSI cylinder test pressure
• Rugged rubber boot protects digital gauges from shop damage
• 1/4" male industrial quick connector for fast setup
• Hose and adapter fit 10 mm, 12 mm, and 14 mm spark plug threads
• Meets FAA leak down test specs for cylinders below 5.00" bore diameter
• Includes molded storage tray and detailed instructions

Specifications

• Brand: Motion Pro
• Model: 57-8740
• MPN: 08-0740
• Test Pressure: 80 PSI (requires 90 PSI air source)
• Max Bore Diameter: 5.00 inches
• Spark Plug Thread Compatibility: 10 mm, 12 mm, 14 mm
• Connector: 1/4" male industrial quick connect
• Certifications: FAA leak down test compliant