SE116 1.47 Complete – C.R. (Replaces Mercruiser Gen II)
Introduction
The SE116 1.47 Complete – C.R. (Replaces Mercruiser Gen II) for marine is a high-performance sterndrive system designed specifically for boaters looking for reliable, long-lasting propulsion. Built as a direct replacement for the Mercruiser Alpha One Gen II, this complete unit combines exceptional torque, superior hydrodynamics, and compatibility with a wide range of marine engines. Whether you’re restoring a vintage watercraft or upgrading your existing powertrain, the SE116 1.47 delivers durability, value, and seamless integration.
This product stands out due to its high gear ratio, corrosion-resistant build, and plug-and-play installation features. It caters to professionals and recreational boaters alike who seek peace of mind when cruising coastal or inland waters. In this article, we’ll break down everything from product specifications to installation, maintenance, and frequently asked questions to help you make an informed decision.
Overview / What Is SE116 1.47 Complete – C.R.?
The SE116 1.47 Complete – C.R. is a complete upper and lower unit that replaces the Mercruiser Alpha One Gen II sterndrive. The “1.47” refers to the gear ratio, which is ideal for high-speed performance applications using small to mid-size marine engines.
Designed for clockwise rotation (C.R.), this unit features a compact design, hydrodynamic lower housing, and OEM compatibility. It includes everything from the water pump to internal gearing and shift linkages, making it ready to install right out of the box.
- Gear Ratio: 1.47:1
- Application: Mercruiser Gen II Replacement
- Compatibility: Works with 4-cylinder to small V6 marine engines
- Rotation: Clockwise (standard rotation)
Performance Features of the SE116 1.47
The SE116 1.47 offers premium features that enhance both performance and longevity in marine environments. Its ratio makes it ideal for lighter boats that need quicker acceleration and higher top speeds. It’s favored among boaters using 3.0L, 4.3L, or similar Mercruiser-compatible marine engines.
Its high-strength aluminum housing with a corrosion-resistant coating ensures it resists saltwater wear. The low-profile hydrodynamic design also minimizes drag, allowing for smoother navigation and fuel efficiency.
Compatibility and Installation Considerations
This sterndrive is built to be a bolt-on replacement for Mercruiser Gen II drives from 1991 and newer. It fits easily into most Alpha One Gen II transom assemblies and matches with commonly used gimbal housings and engine couplers. No special modifications are necessary for compatible setups.
However, ensure the gear ratio matches your boat engine’s specification. A mismatch can lead to engine strain, poor fuel economy, or performance loss. It’s advisable to consult an expert if you’re unsure about your engine-gear ratio combination.
Maintenance Tips
To keep your SE116 1.47 Complete – C.R. in top shape, regular maintenance is essential. Proper care will extend the lifespan of the unit and enhance your engine’s performance.
- Change Gear Lube: Check the gear oil after every 20 hours of operation. Replace at least once per season or after extended use.
- Inspect Prop and Seals: Damaged propellers or seals can cause water intrusion. Check regularly and replace as needed.
- Winterize Properly: Flush out all salt or brackish water, especially before storage. Add anti-corrosive sprays to internal components.
- Monitor Water Pump: Check for water flow and replace impellers every 2 years or 100 hours, whichever comes first.
Why Choose SE116 Over OEM Mercruiser?
One of the most common questions is why choose SE116 over the original Mercruiser sterndrive. The answer lies in affordability, performance, and availability. The SE116 delivers comparable—if not better—performance at a lower cost.
OEM drives are often more expensive and sometimes backordered, whereas SE116s are readily available and backed by competitive warranties. This drive also comes pre-assembled, eliminating much of the guesswork in installation.
Expert Advice and Pro Recommendations
If you are using a 3.0L or 4.3L engine on a medium-sized vessel and prioritize speed, the SE116 1.47 Complete – C.R. (Replaces Mercruiser Gen II) is a perfect fit. Marine professionals recommend pairing this drive with stainless steel props to maximize efficiency and speed performance.
Use synthetic marine gear oil and avoid low-grade lubricants that can cause internal gear wear. Also, always double-check alignment during installation to prevent coupler damage. Use code WELCOME5 to get 5% off your purchase at All Boat Supplies.
Understanding the Gear Ratio: 1.47 Explained
The 1.47 gear ratio means the engine shaft turns 1.47 times for every one rotation of the propeller. This is considered a high-speed ratio and is best suited for lighter boats or vessels that need to cruise quickly across open water.
Choosing the right gear ratio is crucial because it affects RPM ranges, fuel efficiency, and how much load your engine endures. The SE116 1.47 strikes a fine balance between acceleration and top-end speed for small to mid-sized boats.
Troubleshooting SE116 1.47 Common Issues
Although the SE116 1.47 is a reliable drive, like all marine components, it can experience occasional issues. Common problems include water in the gear oil, low performance, or noise during operation.
Most of these can be resolved by:
- Checking for damaged props or bent shafts
- Ensuring the water pump impeller is functional
- Flushing and replacing contaminated gear oil
- Realigning the drive to the engine coupler
If symptoms persist, consult a marine mechanic to perform a full inspection. Proper installation and routine care are key to avoiding long-term issues.
Detailed FAQ Section
Is SE116 1.47 compatible with all Mercruiser engines?
No, it is not universally compatible with all Mercruiser engines. The SE116 1.47 is specifically designed to replace Mercruiser Alpha One Gen II drives, typically for engines ranging from 120HP to 250HP. It’s best used with 3.0L, 4.3L, and similar setups. Always verify the gear ratio of your existing drive and match the correct rotation direction (clockwise for this model).
Incorrect pairing may cause engine strain, overheating, or poor fuel economy. If your current drive uses a different gear ratio or is reverse rotation, consider a different SEI model. Installation requires a Gen II-compatible transom assembly and prop shaft alignment.
How do I install the SE116 1.47 Complete – C.R.?
The SE116 1.47 is designed as a drop-in replacement, but proper installation is crucial. Start by removing your existing drive, including the upper and lower housings. Inspect the bellows, gimbal bearing, and engine coupler for wear or corrosion.
Next, align the drive shaft with the coupler using a drive alignment tool. Slide the SE116 into place, ensuring all mounting bolts and shift linkages are properly seated. Fill the unit with marine-grade gear lube from the bottom up until it overflows at the vent hole. Test engine shift and throttle response before water testing. Detailed instructions come with the drive, but a professional installer is recommended for best results.
What makes the SE116 1.47 a better option than rebuilding an old Gen II?
Rebuilding an old Alpha One Gen II can cost more in the long run due to part replacement, labor, and the risk of hidden damage. The SE116 1.47 arrives pre-assembled and tested, meaning less downtime and higher reliability.
It also includes new gears, seals, bearings, and impellers—components that typically wear down over time. A rebuild may offer a short-term fix, but a new drive offers a long-term solution with a fresh warranty and no hidden surprises. For boaters wanting peace of mind, new always wins.
How durable is the SE116 in saltwater conditions?
The SE116 1.47 is designed to withstand both freshwater and saltwater environments. It features a high-strength aluminum body coated with corrosion-resistant materials. Additionally, internal components like the impeller and seals are made from marine-grade materials to reduce salt-induced wear.
However, durability depends on maintenance. Always flush the unit after saltwater use, check the zinc anodes regularly, and apply marine anti-corrosive spray around the trim tab and exhaust ports. With proper care, it can last many seasons even in harsh conditions.
What does the warranty cover?
The SE116 1.47 typically comes with a three-year limited warranty, covering defects in materials and workmanship. This includes internal parts like gears, bearings, and shafts as long as proper installation and use are verified. It does not cover damage caused by improper installation, abuse, or lack of maintenance.
Keep all receipts, maintenance logs, and installation photos to streamline warranty claims. If issues occur within warranty, All Boat Supplies will help facilitate a fast replacement or repair based on the manufacturer’s guidelines.
Conclusion
The SE116 1.47 Complete – C.R. is a trusted, performance-ready alternative to the original Mercruiser Alpha One Gen II. It offers premium build quality, easy installation, and budget-friendly pricing without sacrificing reliability or power. Whether you’re a weekend boater or full-time marine enthusiast, this drive is a smart, future-proof investment. Don’t forget to use code WELCOME5 at checkout for an extra 5% off.
Special Offer
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