Mercruiser Alpha One R/MR Sterndrive



Alpha® One Drive

The most popular sterndrive in the world. Single/twin applications up to 65 mph for diesel engines up to 150hp


The Alpha One drive earned the title of “world’s most popular sterndrive” because it delivers reliable performance in a value package. Reliable performance means more family fun year after year without missing a beat. Alpha One drives slice through the water with an efficient hydrodynamic profile producing very little drag. And, because of the Alpha drive’s many maintenance-free features, you’ll enjoy a worry-free ownership experience.

Part#5010147CP #5010162CP/601000CP

It’s the world’s most popular sterndrive for many reasons. Alpha One drives slice through the water almost effortlessly, thanks to their efficient hydrodynamic profile, which produces minimal drag and improves responsiveness. Alpha One is designed for boats capable of cruising at up to 65 mph, paired with petrol engines delivering up to 300hp. But what really makes this drive so popular is its low cost of operation. Maintenance-free features, including an integrated water pump and permanently lubricated pivot points, dramatically reduce maintenance time and costs while improving reliability and, ultimately, your boating experience.

 The features of the Alpha I include:

  • Part#5010147CP #5010162CP
  • Spiral-cut steel bevel gears for quiet operation and durability.
  • XK360 low copper alloy for corrosion resistance.
  • Tri-Paint System (Irridite, EDP & Powder Paint) creates a tough, durable corrosion resistant barrier.
  • Armored trim lines protect hydraulic system from debris.
  • Flow-Torq II Propeller Hub The Weekend Saver protects the entire drive from damage, not just the lower unit.
  • Hydrodynamic lower unit produces little drag to slice through the water efficiently.
  • Trim limit switch sets drive angle for maximum performance every time.
  • Drive Lube Monitor Alarm warns if drive lube is low.
  • Permalube® U-Joint Virtually no maintenance required.
  • Maintenance Free Hinge Pins.
  • Greaseable Drive Coupler from inside the boat.
  • Power Trim XD® Automatically Returns the Drive to the Water to Maintain Full Control of Boat in Case of an Emergency.


Mercruiser Sterndrive and Inboard Brochure

Maximum Power Capacity 300 HP (230 kW)
Lower Unit Design Low-Drag Hydrodynamic Torpedo
Maximum Propeller Diameter 15″
Water Inlet Location Strut
Clutch Type Compact Dog Clutch with F-N-R
Available Gear Ratios 1.47, 1.62, 1.81, 2.00, 2.40:1
Counter-Rotation Optional, Except 2.40:1 Ratio
Upper Unit Gear Set Precision Shimmed, Spiral Bevel Gear
Lower Unit Gear Set Precision Shimmed, Spiral Bevel Gear
Propshaft Material Heat-Treated Stainless Steel
Standard Exhaust Outlet Through Propeller
Propeller Hub Type Flo-Torq II Hub
Recommended Lubricant Mercury High-Performance Gear Lube
Monitoring System Engine-Mounted Lube Monitor w/Audio Warning or Engine Guardian®
Corrosion Warranty 3-Year, Limited
Housing Construction Corrosion Resistant XK 360 Aluminum Low-Copper Alloy
Corrosion Protection Tri-Paint, Anodes & MerCathode® as a Kit
Anode Type Ultra-Pure Aluminum Anodes or Magnesium Anode Kit
Speedometer Pick-up Integrated Into Lower Housing
Steering System Single Cylinder Power Steering with Anti-Feedback
Steering Range 56° Range Stop to Stop
U-Joint Type Permalube® Virtually Maintenance-Free
Power Trim System Twin-Cylinder Hydraulic Featuring Power Trim XD® Kick-up Return
Typical Trim Range 5° to 15°
Trim Limit Switch Standard – Adjustable
Trailer Limit 53°
Trim Hinge Pin Design Permanently Lubricated – No Maintenance Required
Hydraulic Trim Lines Stainless Steel Braided Armor
Drive Coupler Greaseable From Inside Boat
Drive Weight 85 lbs. (38 kg)

Additional information