Diesel Pro Sells Rebuilt Twin Disc MG5061 (Shallow Case) Marine Transmissions

Rebuilt Twin Disc MG5061 Marine Transmissions for Sale

Our rebuilt MG5061 transmissions are meticulously reconditioned to meet or exceed OEM specifications. Each unit undergoes a rigorous process, including disassembly, inspection, replacement of worn components, reassembly, and testing to ensure optimal performance.

Features of our rebuilt MG5061 transmissions:

• Mechanical selector valve assembly (control valve): Ensures precise gear engagement and smooth operation.

• Pilot housing flange: Facilitates secure mounting to the engine.

• Oil pump: Maintains proper lubrication, reducing wear and extending transmission life.

• Oil level gauge: Allows for easy monitoring of fluid levels.

• Output flange: Provides a reliable connection to the propeller shaft.

Note: Drive ring is sold separately.

Available Gear Ratios:

Selecting the appropriate gear ratio is crucial for optimizing your vessel’s performance. We offer the following Twin Disc MG5061 marine transmissions for sale, each tailored to specific operational needs:

• 1.13:1 Ratio: Ideal for high-speed vessels requiring minimal reduction, such as patrol boats and fast ferries.

• 1.28:1 Ratio: Suitable for vessels needing a slight reduction for efficient cruising.

• 1.54:1 Ratio: Balances speed and torque, making it versatile for various marine applications.

• 1.75:1 Ratio: Offers enhanced torque for vessels operating under moderate loads.

• 2.00:1 Ratio: Provides a balance between speed and pulling power, suitable for fishing boats and workboats.

• 2.43:1 Ratio: Delivers increased torque for heavier vessels like trawlers and cargo ships.

• 3.00:1 Ratio: Maximizes torque for demanding applications, including tugboats and large commercial vessels.

Each rebuilt transmission is available for sale and ready to install, ensuring minimal downtime for your operations.

Marine Transmission Specifications & Applications of the Twin Disc MG5061

Overview of the Twin Disc MG5061 Marine Transmission

The Twin Disc MG5061 is a versatile marine transmission designed for light to medium commercial duty and high-performance recreational use. Combining a durable hydraulic clutch system with smooth gear engagement and compact construction, the MG5061 delivers consistent performance for workboats, patrol vessels, pilot boats, and fishing vessels operating in coastal and inland waters.

This transmission is available in both straight and down-angle output configurations and supports both left- and right-hand engine rotation. Its compact footprint and compatibility with a wide range of diesel engines in the 300–450 horsepower range make it an excellent choice for repowers, new builds, and marine operators looking for reliable, easily serviceable propulsion systems.

Key Specifications of the Twin Disc MG5061

• Type: Marine transmission with oil-cooled hydraulic clutch

• Horsepower Rating (Approximate):

  • Continuous Duty: Up to 350 HP @ 1800 RPM

  • Intermittent Duty: Up to 450 HP @ 2300 RPM

• Maximum Input Speed: 2500 RPM

• Reduction Ratios Available:

  • 1.51:1

  • 1.93:1

  • 2.48:1

  • 2.96:1

  • 3.52:1

• Input Housing: SAE No. 2 or SAE No. 3

• Flywheel Compatibility: 11.5″, 14″

• Clutch Type: Hydraulically actuated, oil-cooled multi-disc clutch

• Cooling System: Standard oil-to-water heat exchanger; oil-to-air optional

• Lubrication: Internal oil pump with full pressure-fed lubrication system

• Oil Capacity: Approximately 6–8 quarts depending on configuration

• Dry Weight: Approximately 350–425 lbs

• Mounting Options: Available in straight or down-angle output

• Rotation Compatibility: Bi-directional input (clockwise or counterclockwise engine rotation)

• Optional Features:

  • Hydraulic or mechanical PTO

  • Trolling valve for low-speed operation

  • Flexible or rigid mounting options

Common Marine Applications for the MG5061

The MG5061 is well-suited for small to mid-size commercial vessels and high-performance recreational boats requiring smooth shifting, high durability, and dependable operation. It’s commonly used in:

• Pilot and Patrol Boats: Offers quick shift response and quiet operation in harbor security and enforcement roles.

• Fishing Boats (Inshore and Coastal): Supports mid-range diesel engines operating under daily load conditions.

• Passenger Ferries and Tour Boats: Delivers low-vibration performance for vessels with frequent stop-start operations.

• Utility and Workboats: Used in tenders, harbor line boats, and crew transport craft.

• Recreational Cruisers: A popular choice for pleasure yachts needing a balance of torque, size, and smooth shifting.

Most Common Engine Models Paired with the Twin Disc MG5061

The MG5061 is typically matched with marine diesel engines producing between 300 and 450 horsepower. Its SAE No. 2 or 3 housing compatibility, gear ratio flexibility, and compact profile make it easy to integrate into many existing and new propulsion systems.

Cummins Marine Engines

• Cummins QSB 5.9

• Cummins QSB 6.7

• Cummins ISC 8.3 (light duty ratings)
  These engines provide high torque at low RPMs and are frequently paired with MG5061 transmissions in pilot boats, patrol craft, and fast ferries.

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  See The Cummins Engines Parts Catalog By Diesel Pro Power

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Caterpillar Marine Engines

• Caterpillar 3116 / 3126

• Caterpillar C7
  These Caterpillar engines offer compact power and strong mid-range performance, aligning well with the MG5061’s hydraulic clutch and gear strength.

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  See The Caterpillar Engine Parts Catalog By Diesel Pro Power

John Deere Marine Engines

• John Deere 6068SFM75

• John Deere 6090SFM85
  Widely used in ferries, tugs, and utility boats, these engines are a strong match for the MG5061 when continuous mid-duty performance is needed.

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See Diesel  Pro Power Freshwater  Pumps For John Deere Engines

Detroit Diesel Marine Engines

• Detroit Diesel 6V53

• Detroit Diesel 6-71 (light-duty ratings)
  Frequently used in commercial boats from the 1970s–1990s, these engines remain a popular pairing for MG5061 in refit applications.

  See The Detroit Diesel Engine Parts Catalog By Diesel Pro Power

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Advantages of the Twin Disc MG5061 Transmission

• Reliable Hydraulic Clutch System: Oil-cooled multi-disc clutch ensures smooth gear engagement and long service life.

• Flexible Installation Options: Available in straight or down-angle outputs for ease of alignment in tight engine rooms.

• Wide Gear Ratio Range: Offers excellent customization for hull type, speed profile, and propeller load.

• Durable Under Load: Rated for continuous duty in vessels operating in commercial or high-performance environments.

• Mechanical Simplicity: Easy to maintain and repair in the field or during scheduled maintenance intervals.

Ideal Use Cases for the MG5061

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