Twin Disc MG520 Marine Transmission Parts - Gasket Set Section

Twin Disc MG520 Marine Transmission Parts – Gasket and Seal Kit Section

The Twin Disc MG520 and MG520-1 Gasket and Seal Kit provides a full sealing solution for these heavy-duty marine gears. Designed for both commercial and recreational vessels, this kit ensures your MG520 operates with proper hydraulic pressure, clean oil retention, and zero fluid leaks. Over time, exposure to high torque, constant oil flow, and marine heat cycles breaks down gaskets and seals—leading to leaks, low pressure, or slipping clutch packs. Installing a fresh gasket and seal kit restores the integrity of every mating surface and hydraulic passage within the transmission.

Gasket and Seal Kit for Twin Disc MG520 & MG520-1

This comprehensive kit includes:

• All main housing and cover gaskets
  
  

• Shaft seals for input and output drives
  
  

• O-rings and sealing washers for internal pressure passages
  
  

• Drain plug and filler gaskets for full containment protection
  
  

Each component is manufactured to meet or exceed Twin Disc OEM tolerances, ensuring reliable sealing performance under continuous marine operation. When installed with a complete overhaul, this kit helps maintain clean oil circulation and full clutch engagement, minimizing the risk of overheating or gear wear.

Overhaul Plate Kit for Twin Disc MG520 & MG520-1

The Overhaul Plate Kit includes the friction and steel clutch plates that form the core of the MG520’s torque transfer system. These plates engage under pressure to connect the engine to the propeller shaft, and over time they wear down, causing slippage or reduced efficiency. Installing a new plate kit restores crisp clutch engagement, consistent shifting, and dependable torque transfer under heavy loads.

When paired with the gasket and seal kit, you achieve a complete transmission refresh—perfect for major service intervals or total rebuilds.

Rubber Block for Twin Disc Marine Gears

The rubber block is a vibration-damping component. It absorbs torsional shock between the transmission and the drive coupling, reducing vibration and protecting the internal components. Over time, these blocks can harden or crack, which increases vibration and accelerates wear. Replacing them restores smoother operation and reduces mechanical stress.

Marine Gear Oil Pressure Gauges

Monitoring transmission oil pressure is vital to detect early issues such as fluid loss or clutch wear. Diesel Pro Power offers both mechanical and electrical marine gear oil pressure gauges calibrated for up to 400 PSI.

• The mechanical gauge provides direct, real-time pressure readings and includes a light bulb for low-light operation.
  
  

• The 12-volt electrical gauge connects to a sending unit and is ideal for modern dashboards, providing consistent readings without the need for direct oil line routing.
  
  

Regular oil pressure monitoring ensures that your MG520 or MG520-1 transmission maintains proper clutch actuation and lubrication flow, preventing costly damage.

Signs You May Need These Kits or Components

• Persistent oil leaks at case joints or around shafts
  
  

• Drop in hydraulic oil pressure or sluggish clutch response
  
  

• Transmission fluid contamination or overheating
  
  

• Excessive vibration or noise from hardened rubber blocks
  
  

• Fluctuating or low readings on oil pressure gauges
  
  

Why Buy Parts For The Twin Disc MG520 from Diesel Pro Power

• Engineered for Precision Fit: Each gasket, seal, and plate kit is tailored for MG520 and MG520-1 transmissions—no generic substitutes.
  
  

• Proven Marine Reliability: All materials are designed for saltwater exposure, oil pressure stability, and long-term durability.
  
  

• Complete System Coverage: From overhaul plate kits to gauges and vibration isolators, every component is available in one place.
  
  

• Trusted by 40,000+ Customers: Diesel Pro Power’s reputation in marine parts comes from consistent quality and expert technical support.
  
  

• Fast Worldwide Shipping: All MG520 parts are in stock and ready for immediate dispatch to keep downtime minimal.