Description
Sierra 18-99530 Pressure & Vacuum Tester – Marine Gearcase Diagnostic Tool
The Sierra Pressure & Vacuum Tester - 18-99530 is a professional-grade marine diagnostic tool designed to test the seal integrity of outboard motor gearcases, outdrives, and lower units. This convenient dual-function tester combines pressure and vacuum testing in one tool, helping marine technicians identify leaks before water intrusion can cause costly internal gear and bearing damage.
With the ability to quickly switch between pressure testing and vacuum testing, the Sierra 18-99530 eliminates the need for separate pressure and vacuum testers. Simply operate the side-mounted valve to change testing modes and efficiently diagnose lower unit and gearcase sealing problems.
Key Features & Specifications
- Dual Functionality: Safely performs both pressure and vacuum testing to catch lower unit leaks before water intrusion causes terminal gear damage.
- Included Components: Features the 551-34HA hose assembly, alongside the 551-334M and 551-334S diagnostic adapters.
- Cross-References: Directly replaces the CDI Electronics 551-34PV and Stevens S34/V34 models.
- Maintenance Note: If the internal seals wear out over time, a dedicated repair kit can be ordered using part number 551-34R.
- Repair Kit: 551-34R
Test Outboard Lower Units for Leaks
Regular lower unit pressure and vacuum testing is an important part of marine engine maintenance. Detecting a compromised seal early can help prevent water from entering the gearcase and contaminating the gear lubricant, potentially protecting gears, bearings, seals, and other critical components.
The Sierra 18-99530 provides a practical solution for outboard motor troubleshooting, gearcase leak detection, lower unit maintenance, and marine engine service.
Replacement Seal Repair Kit
If the tester's internal seals eventually become worn, a replacement repair kit is available. The Sierra 551-34R repair kit can help restore the tester for continued service.
Get the Sierra 18-99530 Pressure & Vacuum Tester from U.S. Boating & Marine Supplies and make lower unit and gearcase leak testing easier and more efficient. Shop now for professional marine diagnostic tools and boat maintenance equipment.
