Twin Disc MG 506 Marine Transmission Parts for Australia - Overhaul Plate Kit Section

Twin Disc MG506 — Overhaul Plate Kit & Related Service Parts 

The MG506 is a dependable Twin Disc marine gear used in workboats, patrol craft, fishing fleets, and long-range cruisers. When engagement gets lazy, slip shows up under load, or oil weeps appear around covers and shafts, the fastest path back to crisp shifts and reliable torque transfer is a targeted refresh of the clutch pack and companion soft parts. Below is a clean, catalog-style guide: each item states what it is, what it does, and the signs that mean it’s time to replace it.

Overhaul Plate Kit — Twin Disc MG506 / MG506-1

What it is: Complete friction and steel plate set for the MG506 family.
What it does: Restores clutch pack stack height and surface condition so the gear engages smoothly and holds torque without slip.
When to replace: Delayed/mushy engagement into forward or reverse; RPM flare under load; chatter on take-up; discolored or glazed plates found at inspection.
Notes: Same clutch plate spec across MG506 and MG506-1; no ratio-specific plate selection required. Pair with a gasket & seal kit whenever the case is opened.

Ring Drive (SAE #2) — MG506 / MG507 / MG507-1

What it is: SAE #2 engine-to-gear ring drive.
What it does: Couples the engine flywheel to the MG506 input while maintaining alignment and balance.
When to replace: Tooth wear or fretting on contact faces; elongated bolt holes; rattle or clunk at the bellhousing.
Notes: Confirm SAE #2 housing and bolt circle. Inspect the flex plate (if used) and hardware; replace fatigued fasteners together.

Gasket & Seal Kit — Twin Disc MG506 / MG506-1

What it is: Full soft-parts kit (gaskets, O-rings, input/output shaft seals) for the MG506.
What it does: Reseals covers, shafts, and passages to maintain oil integrity and hydraulic apply pressure.
When to replace: Any time the gear is opened for clutch work; evidence of weeping at covers or shafts; oil film beneath the gear.
Notes: Preventative soft-part renewal protects fresh clutch plates from low-pressure slip and avoids repeat labor.

Rubber Block — MG506 / MG507 / MG509 (where used)

What it is: Torsional isolation block used in specified Twin Disc driveline sub-assemblies.
What it does: Cushions shock loads and filters torsional vibration to protect the clutch packs and gear train.
When to replace: Visible cracking, hardening, or permanent set; new vibration or thump during engagement or throttle changes.
Notes: Fresh isolation reduces impact loading on renewed clutch packs.

Output Shaft Coupling — Twin Disc MG506

What it is: Output coupling/flange matched to MG506 shaft size and bolt/spline pattern.
What it does: Transfers torque to the propeller shaft while preserving alignment and bolt preload.
When to replace: Spline fretting or corrosion; elongated bolt holes; face runout; driveline vibration not traced to prop or alignment.
Notes: Selection is based on shaft diameter and mounting pattern; some builds associate coupling choice with certain ratio groups. Verify shaft data before ordering and recheck alignment after changes.

Quick “Symptom → Part” Reference

• Slow or soft engagement; flare under load → Overhaul Plate Kit (add Gasket & Seal Kit if leaks are present).
  
  

• Oil seepage at covers or shafts; marginal apply feel → Gasket & Seal Kit.
  
  

• Noise at engine interface; visible fretting → Ring Drive (SAE #2).
  
  

• New vibration or harsh load transfer → Rubber Block; assess Output Coupling.
  
  

• Wear at tail end (bolt pattern/spline) → Output Shaft Coupling.
  
  

Fitment & ID Reminders

• Model: MG506 or MG506-1 (nameplate on housing).
  
  

• Clutch plates: Same spec across the MG506 family; select the MG506 overhaul kit without ratio split.
  
  

• SAE Housing: Ring drive listed here is SAE #2—confirm before purchase.
  
  

• Coupling: Verify shaft diameter and bolt/spline pattern; check alignment after installation.

Why Buy Your MG506 Overhaul Plate Kit From Diesel Pro Power

Purpose-built for the MG506 family.
Our kit uses the correct friction and steel plates for Twin Disc MG506 and MG506-1—the same plate spec used across the MG506 family. You don’t have to “guess” by ratio; you get the right stack, the first time.

Consistent, dock-friendly engagement.
Marine-grade friction linings and flatness-controlled steels restore proper stack height and release clearance to help eliminate lazy shifts, flare under load, and chatter during close-quarters maneuvers.

Catalog clarity, zero surprises.
We label fitment exactly as MG506 / MG506-1 and clearly note companion parts (gasket & seal kit, SAE #2 ring drive, rubber block, output coupling) so you can complete the service in one order.

Matched components you can bundle.
Pair the overhaul plate kit with our MG506 gasket & seal kit to reseal covers and shafts while you’re in the case—protecting fresh plates from low apply pressure and preventing repeat labor.

Quality you can feel, reliability you can trust.
Each plate set is sourced to marine standards for oil-immersed service, repeat docking cycles, and thermal stability. Steels are chosen for surface finish and flatness to reduce break-in chatter.

Pro packaging and readiness.
Kits arrive organized and protected to prevent edge damage or contamination. That means less prep time on the bench and fewer callbacks after launch.

Fitment support from real gearbox specialists.
Need to confirm MG506 vs. MG506-1, SAE #2 ring drive details, or output coupling specifics? Our team works this platform daily and can validate selections against your nameplate and shaft data.

Fast global fulfillment.
Commercial schedules can’t wait. We ship quickly and handle export documentation regularly so fleets, shipyards, and remote operators keep moving.

Backed by experience and trust.
Diesel Pro Power serves 40,000+ satisfied customers worldwide—captains, fleet managers, and marine mechanics who depend on accurate parts and dependable outcomes.

Straightforward returns and accountability.
If something isn’t right, we fix it. Clear policies and responsive human support keep projects on schedule and budgets intact.

One supplier for your whole MG506 refresh.
From the overhaul plate kit to seals, ring drive, rubber block, and output coupling—source everything in one place to simplify purchasing, shipping, and warranty tracking.