Twin Disc MG 509 Marine Transmission Parts for Australia - Gasket Set Section

Twin Disc MG509 Marine Transmission Parts – Gasket & Seal Kit Section

The Twin Disc MG509 gasket and seal kit collection is engineered to restore sealing integrity and prevent leaks in both shallow and deep case MG509 marine transmissions. Designed to handle the heat, pressure, and vibration of continuous marine operation, each kit includes the precise gaskets, O-rings, and seals needed for a full reseal. In addition, the rubber block set provides essential vibration isolation and power transfer stability between the transmission and engine assembly. Together, these components ensure the MG509 continues to operate smoothly, quietly, and reliably in demanding marine environments.

Seal Kit for Shallow Case (Ratios 1.45 to 3.38)

The Twin Disc MG509 shallow case gasket and seal kit is designed for transmissions with gear ratios ranging from 1.45 to 3.38. This complete kit contains every gasket, O-ring, and seal required to reseal the transmission’s hydraulic circuits and housing joints. Built from high-quality, oil- and temperature-resistant materials, these components ensure tight sealing, preventing leaks that could lead to hydraulic pressure loss or fluid contamination.

Ideal for routine maintenance or full overhauls, this kit helps extend the life of your MG509 by maintaining correct internal pressure and preventing premature wear of clutches and bearings. Installing a fresh gasket set restores factory-level sealing performance and helps maintain consistent operation under load.

Seal Kit for Deep Case (Ratios 3.83 to 4.95)

The Twin Disc MG509 deep case gasket and seal kit serves transmissions with ratios from 3.83 to 4.95. This version is specifically designed for the deep case housing used in higher torque configurations. Each component is precision-fit to ensure a secure seal between all mating surfaces, maintaining hydraulic efficiency even under extreme operating conditions.

Replacing worn seals and gaskets prevents fluid leaks, gear slippage, and contamination that can shorten transmission life. Whether used for scheduled maintenance or during a complete rebuild, this kit ensures long-term reliability and optimal performance of your MG509 marine gear.

Rubber Blocks for Twin Disc MG509

The rubber blocks used in the Twin Disc MG509 play a vital role in vibration control and torque isolation between the engine and transmission. Each MG509 requires 26 rubber blocks for proper installation. Made from heavy-duty, marine-grade rubber, these blocks are designed to withstand oil, heat, and the constant flexing of marine propulsion systems.

Over time, rubber mounts naturally degrade, leading to vibration, noise, and potential misalignment. Replacing all 26 blocks ensures even load distribution, reduced mechanical stress, and smoother transmission performance. Together with the gasket and seal kit, the rubber blocks help protect the MG509’s internal components and maintain balanced operation across all gear ratios.

Why Buy Your Twin Disc MG509 Parts from Diesel Pro Power

• 40,000+ satisfied customers worldwide – trusted by fleets, captains, and shipyards.
  
  

• Get the right part the first time – all kits and components organized by exact model and ratio range.
  
  

• Bilingual technical support (English & Spanish) – experienced team ready to verify fitment and assist with installation.
  
  

• Fast worldwide shipping – most orders ship the same day to minimize vessel downtime.
  
  

• Premium aftermarket quality – built for marine durability, reliability, and long service life.
  
  

• Easy, secure online ordering – detailed listings, clear specifications, and professional support.
  
  

Diesel Pro Power provides everything you need to properly service your Twin Disc MG509, including gasket and seal kits for both shallow and deep case models and the complete set of rubber blocks for smooth, vibration-free performance.