SeaStar Solutions offers a comprehensive range of hydraulic steering systems tailored for various boating and marine applications, each comprising specific components with unique part numbers. We provide this as reference for those who are upgrading to our complete 350 HP Hydraulic Steering Systems, 700 HP Hydraulic Steering Systems, custom length steering hose lines, our faster 2.7 Helm, or 700 HP Front Cylinder or use our Self-Bleeding Kit (for one-person operation). We've made sure all our steering parts are compatible and interchanging with Sea Star to ensure the we can cost effectively solve our customer rigging needs. Below is an organized overview of key boat hydraulic steering parts and their associated part numbers: 1. Helm Pumps: SeaStar 1.7 Front Mount Helm: HH5271-3 SeaStar 2.0 Front Mount Helm: HH5273-3 SeaStar 2.4 Front Mount Helm: HH5272-3 SeaStar 1.7 Rear Mount Helm: HH5261-3 SeaStar 2.4 Rear Mount Helm: HH5262-3 SeaStar 1.7 Sport Tilt Helm: HH5291-3 SeaStar 2.4 Sport Tilt Helm: HH5292-3 SeaStar 1.7 Classic Tilt Helm: HH5741-3 SeaStar 2.4 Classic Tilt Helm: HH5742-3 SeaStar Pro Helms: SeaStar Pro 1.7 Standard Mount: HH5779-3 SeaStar Pro 1.7 Rear Mount: HH5778-3 SeaStar Pro 1.7 Tilt: HH5773-3 SeaStar Pro 2.0 Standard Mount: HH5770-3 SeaStar Pro 2.0 Rear Mount: HH5771-3 SeaStar Pro 2.0 Tilt: HH5774-3 SeaStar Pro 2.0 Sport Tilt: HH5290-3 SeaStar Pro 2.4 Standard Mount: HH5772-3 2. Steering Cylinders: Front Mount Cylinders: HC5340-3, HC5342-3, HC5345-3, HC5347-3, HC5348-3, HC5358-3 Side Mount Cylinder: HC5370-3 Splashwell Mount Cylinder: HC5380 Catamaran/Pontoon Cylinder: HC5375-3 Inboard Cylinders: HC5312-3, HC5313-3, HC5314-3, HC5318, HC5319 3. Hose Kits: SeaStar Hose Kit (2 hoses): HO51xx SeaStar Bulkhead Hose Kit (2 hoses): HO81xx 4. Fitting Kits: Add-A-Station Kit (Nylon/Copper Tube): HF6010 Add-A-Station Kit (Hose): HF6007 Autopilot Fitting Kit (For All Helms): HF5502 5. Tubing: 3/8” Diameter Nylon Tubing: HT5xxx 6. Steering Fluid: SeaStar Oil (1 Quart): HA5430 SeaStar Oil (1 Gallon): HA5440 7. Service Items: Helm Shaft Seal and Locknut Kit: HP6032 Steering Wheel Hardware Kit: SA27454P 8. Optional Equipment: SeaStar Round Bezel Kit: HA5478 SeaStar Backplate Kit: HA5418 SeaStar 20° Dash Wedge Kit: HA5419 Power Assist Steering: PA1200-2 For a detailed and comprehensive list of all components and their respective part numbers, please refer to the SeaStar Solutions Parts Catalog . *Note: The 'xx' in part numbers (e.g., HO51xx) denotes variable lengths or specific configurations. It's essential to select the appropriate specifications based on your boat's requirements. By utilizing the correct part numbers, you can ensure compatibility and optimal performance of your SeaStar steering system.

How to Vacuum vs Pressure Test your Gearcase or Lower Unit! Purpose of the Gearcase Leakage Tester The Gearcase Leakage Tester is an essential tool for identifying air leaks in outboard and sterndrive gearcases. Using vacuum testing, this device ensures that seals, O-rings, and gaskets are functioning correctly, protecting the gearcase from water intrusion and potential damage. Components of the Tester Hand Pump:  Creates a controlled vacuum for accurate leakage detection. Vacuum Gauge:  Measures 0 to 30 inches of vacuum for precise monitoring. Hose and Aluminum Fittings:  Safely connect the tester to the gearcase without damaging threads. Why Vacuum Testing is Superior to Pressure Testing Vacuum testing is a critical diagnostic method for identifying inward leakage, which can occur even when seals hold outward pressure. This inward leakage often allows water to enter the gearcase, leading to contamination, corrosion, and mechanical failure. By creating a vacuum, the tester replicates the conditions that expose these hidden vulnerabilities, providing a more comprehensive assessment than traditional pressure testing. Step-by-Step Instructions Preparation Always follow the engine manufacturer’s service manual for specific testing procedures. Ensure the gearcase is completely free of lubricant to avoid damage to the tester valve. Lubricant contamination voids the tester warranty. Setup Remove the upper vent plug and seal washer from the gearcase. Attach the tester hose fitting to the upper vent hole, ensuring it is hand-tightened to prevent air leaks. Replace the O-ring on the fitting if leakage occurs. Vacuum Test Procedure Use the hand pump to create a vacuum of 7-10 inches on the gauge (specific to most gearcases). Let the vacuum stabilize for 2-3 minutes and observe the gauge reading. If the vacuum remains constant, turn the gearbox box over manually and shift gears several times. Recheck the gauge reading. Consistent vacuum levels indicate that the seals and gearcase are in good condition. Identifying Leaks If the vacuum reading drops, inspect seals, O-rings, and gaskets visually to locate potential leakage points. These areas may allow water to enter the gearcase during operation, even if they hold outward pressure. Safety Warning Never perform a vacuum test on a gearcase filled with lubricant, as this can damage the tester valve and void the warranty. Always test with a dry gearcase. Compatibility and Maintenance The Gearcase Leakage Tester is compatible with a wide range of outboards and sterndrives, including models from Mercury, Johnson, Yamaha, and more (with the included adapter kit). Regular use of this tool ensures early detection of issues, reducing the risk of water intrusion and costly repairs. Manufacturer's Test Instruction - Online free in download PDF format

Comprehensive Guide to Testing the Mercury EFI 2.5L Outboard Air Temperature Sensor (Part Numbers 13221A1 and 13221T01) The air temperature sensor on the Mercury Marine EFI 150, 175, 200, 225 Pro Max, 300 X and Racing (ROS 260, 280, 300 Drag, S3000) EFI 2.0 Liter, 2.4 Liter, 2.5 Liter, and 3.0 Liter 2-stroke V6 outboard engines is a critical component of the engine's fuel management system. It plays a vital role in ensuring optimal performance by providing the ECU (Electronic Control Unit) with real-time data on the intake air temperature. This data allows the ECU to adjust the air-fuel mixture to maintain efficiency and power output, particularly in high-performance applications like the Mercury Marine and Racing EFI engines. The air temperature sensor transmits manifold absolute air temperature, through full rpm range, to the ECU. As air temperature increases “sensor” resistance decreases causing the ECU to decrease fuel flow (leaner mixture). Disconnecting the air temperature sensor (creating an open circuit) will increase fuel flow (richen mixture by 10%). Bypassing air temp sensor (creating a short in circuit) will cause fuel flow to decrease 10%. The air temperature sensor, with part numbers 13221A1  and 13221T01 , must be tested periodically to prevent performance issues and ensure the engine runs as intended. Air Temperature Sensor Testing Procedure Sensor Functionality : The air temperature sensor (P/N 13221A1  or 13221T01 ) measures the intake air temperature and sends this data to the ECU (Electronic Control Unit). The ECU adjusts the air-fuel mixture based on the temperature. Key Behavior: As the air temperature increases, the resistance of the sensor decreases. If the sensor circuit is open  (disconnected), fuel flow increases by 10%. If the sensor circuit is shorted  (bypassed), fuel flow decreases by 10%. Tools Needed : Digital Multimeter  (capable of measuring resistance in ohms). EFI Tester (P/N 91-11001A2)  for detailed ECU system checks. Testing Steps : Disconnect the Sensor : Locate the air temperature sensor (part numbers 13221A1  or 13221T01 ) on the intake manifold and disconnect its wiring harness. Measure Resistance : Set the multimeter to the resistance (ohms) setting. Place the meter leads on the sensor terminals. Compare the resistance reading to the values provided in the service manual. Resistance-to-Temperature Values : At 32°F (0°C) : Resistance is approximately 9,000–11,000 ohms . At 77°F (25°C) : Resistance is approximately 2,000–3,000 ohms . At 100°F (38°C) : Resistance is approximately 1,200–1,400 ohms . Interpret Results : If the resistance values fall within the specified range for the measured temperature, the sensor is functioning correctly. If the resistance is infinite  (open circuit) or outside the expected range, the sensor is faulty and needs replacement. Testing with EFI Tester : Connect the EFI tester to the engine's ECU system. Follow the EFI tester instructions to verify the air temperature sensor's operation within the ECU's feedback loop. Notes : The air temperature sensor (P/N 13221A1 , 13221T01 ) is critical for proper engine performance and fuel efficiency. A faulty sensor can cause the engine to run rich or lean, leading to performance issues or potential engine damage. Always verify the wiring connections and inspect for signs of corrosion or damage before replacing the sensor. Testing the air temperature sensor on Mercury EFI 2.5L outboard engines is a straightforward yet essential procedure to ensure the optimal operation of the engine's fuel management system. Regular inspection and maintenance of this sensor, identified by part numbers 13221A1  and 13221T01 , not only enhance fuel efficiency but also prevent potential damage caused by improper air-fuel mixtures. Following the outlined testing procedure with the right tools ensures that the sensor functions accurately, keeping your high-performance Mercury outboard engine running at its peak.