Stevens Instrument Company S34 Gearcase Pressure Tester for Outboard and Sterndrive

The Stevens Instrument Company S34 Gearcase Pressure Tester is an essential diagnostic tool for marine mechanics and boat owners working with outboard motors and sterndrive gearcases. This professional-grade pressure tester helps identify leaks and seal failures quickly and accurately, ensuring proper gearcase integrity before costly damage occurs.

Key Features:

• Pressure tests outboard and sterndrive gearcases to detect seal leaks and failures
• Fitted with standard 3/8-16 inch vent plug thread for universal compatibility
• Easy-to-read pressure gauge for quick leak detection
• Simple operation: pressurize the gearcase and observe gauge for pressure drop
• Includes adapter for testing intermediate housing on OMC Sterndrives
• Compatible with additional thread adaptors (sold separately) for all gearcase types

When to Use:

Pressure testing should be performed during routine lubricant service operations and following any gearcase repairs. If leakage is apparent due to loss of lubricant, simply pressurize the unit and inspect for signs of seepage around seals, shift rods, and driveshaft areas. Following repairs, gearcases can be checked before filling by pressurizing and submerging in a test tank to visually identify leak points.

This tool helps diagnose problems with shift rod seals, driveshaft seals, and other gearcase components before they lead to water intrusion or complete gearcase failure. Regular pressure testing is a critical preventive maintenance step for preserving the life of your lower unit.