June 2, 2025
Overview
Twin Disc MG516 Ratios for Sale
Key Features and Benefits
Engine Compatibility for the Twin Disc MG516
Confirmed Compatible Engines
Additional Compatible Engines
Compatibility Considerations
SAE Housing and Installation Details
Duty Classification Performance Information
Installation and Maintenance
Service Classifications
Important Notice
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April 1, 2025
Introduction
A. General and Specifications
1. What is the Twin Disc MG516 marine gear?
2. What’s the difference between MG516 and MG5161?
3. What is the typical gear ratio?
4. What is the dry weight of the MG516?
5. What are the overall dimensions?
6. What is the recommended operating oil pressure?
7. What is the oil capacity?
B. Operation
8. Can it be shifted under load?
9. How is it controlled?
10. Does it have a neutral position?
11. What type of vessel is it best for?
12. Is it suitable for twin engine applications?
C. Oil and Fluid Management
13. What type of oil should I use?
14. Can I use synthetic oil?
15. How often should the oil be changed?
16. How do I check the oil level?
17. What if the oil is milky?
D. Maintenance & Inspection
18. How often should I replace the oil filter?
19. What’s the best way to inspect clutch wear?
20. Should I use additives?
21. What are signs of cooler failure?
22. How do I rotate the shaft in storage?
23. How do I winterize the MG516?
E. Troubleshooting
24. Why does the transmission slip in gear?
25. Why is there a delay when shifting?
26. What does it mean if there's no drive in forward or reverse?
27. My oil is foamy—what should I do?
28. What causes high transmission temps?
29. Why does the transmission vibrate under load?
30. I have pressure in neutral, but none in gear—why?
F. Valve & Control System
31. What type of solenoid is used?
32. How do I test a solenoid?
33. Can the MG516 be manually shifted?
34. Why are shifts jerky?
G. Rebuild & Replacement
35. When should I rebuild the MG516?
36. What does a rebuild include?
37. How long does a rebuild take?
38. When should I replace rather than rebuild?
39. Where can I buy a rebuild kit?
40. Do I need special tools for rebuild?
H. Storage and Lay-Up
41. How do I store the MG516 for long periods?
42. Should I remove the cooler during storage?
43. Can I store the MG516 outdoors?
44. How do I recommission after storage?
I. Parts & Sourcing
45. Where can I get replacement filters?
46. Do I need the transmission serial number?
47. Are aftermarket parts as good as OEM?
48. Can I upgrade the MG516 for higher output?
J. Performance and Upkeep
49. How long does the MG516 last?
50. What’s the best way to extend service life?
Final Word
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April 1, 2025
Introduction
Preparing for Long-Term Lay-Up
Step-by-Step: Storage Preparation Process
✅ 1. Perform a Final Operation Test
✅ 2. Drain or Replace Oil
Option B: Fill with Clean Preservative Oil (Wet Storage)
✅ 3. Fogging and Internal Coating (Optional but Recommended)
✅ 4. Seal External Ports
✅ 5. Inspect and Protect External Surfaces
✅ 6. Mounting and Support
Fluid Recommendations and Corrosion Prevention
Preferred Storage Oil Types
Anti-Corrosion Additives
Cooler and Line Considerations
Periodic Maintenance During Storage
Weekly (Short-Term Storage Only)
Monthly
Quarterly
Annual
Additional Tips for Preserving the MG516 in Storage
Climate Control Considerations
Shaft Seal Protection
Electronic System Storage (if applicable)
Tagging and Documentation
Recommissioning After Storage
✅ 1. Inspect Exterior and Connections
✅ 2. Drain and Refill With Operational Oil
✅ 3. Install New Filter
✅ 4. Rotate Shaft Manually
✅ 5. Check Shaft Seals
✅ 6. Reconnect Cooler Lines and Prime
✅ 7. Conduct Initial Start-Up
✅ 8. Load Test
Summary: Storage, Preservation & Long-Term Maintenance for Twin Disc MG516 Marine Gear
Key Takeaways:
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April 1, 2025
Introduction
Common Symptoms and Causes
⚠️ 1. No Drive in Forward or Reverse
⚠️ 2. Slipping in Gear
Common Causes:
⚠️ 3. Delayed Engagement
⚠️ 4. Overheating Oil
⚠️ 5. No Reverse or No Forward Only
Diagnostic Tips: Pressure Testing and Performance Indicators
Step 1: Check Oil Level and Condition
Step 2: Read Hydraulic Pressure
Step 3: Shift Function Test
Step 4: Listen and Feel
Step 5: Inspect Filters and Coolers
Step 6: Check Electronic Inputs (if equipped)
Step 7: Check Linkage (Manual Units)
Interpreting Pressure Behavior
When to Call a Specialist
Call a Twin Disc Specialist or Rebuilder If:
Summary Diagnostic Flowchart
Real-World Troubleshooting Examples
Case 1: Charter Boat With No Drive
Case 2: Workboat with Slipping Forward
Case 3: Intermittent Delay in Reverse
Preventative Tips to Reduce Downtime
Recommended Troubleshooting Tools
Final Takeaway: Troubleshooting the MG516 Is a Step-by-Step Process
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April 1, 2025
Introduction
Rebuild Kits for Twin Disc MG516 Marine Gear
What Is a Rebuild Kit?
What’s Typically Included in an MG516 Rebuild Kit?
Types of Rebuild Kits Available
Why Use a Pre-Packaged Kit?
Where to Buy MG516 Rebuild Kits
Commonly Replaced Parts for Twin Disc MG516 Marine Gear
1. Filters
2. Gasket Sets
3. Shaft Seals
4. Clutch Friction and Steel Plates
5. Control Valve Components
6. Bearings and Thrust Washers
When to Replace vs Rebuild a Twin Disc MG516
Rebuild the MG516 When:
Replace the MG516 When
Cost Comparison: Rebuild vs Replacement
Downtime Considerations
Rebuild Lead Time
Replacement Lead Time
Maintenance Stock Recommendations for MG516 Operators
Emergency Spare Parts
Long-Term Support Inventory
Quality Considerations: OEM vs Aftermarket
OEM (Twin Disc)
Aftermarket (Diesel Pro Power)
Tips for Successful Rebuild Planning
Summary: Recommended Spare Parts and Kits for Twin Disc MG516 Marine Gear
Key Takeaways:
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April 1, 2025
Introduction
Torque Specifications for Twin Disc MG516 Marine Gear
Why Torque Specifications Matter
General Torque Guidelines (Typical MG516 Values)
Component
Torque Specification
Using a Torque Wrench Correctly
Torque Sequencing Examples
Fastener Cleaning and Preparation
Use of Gasket Sealant and RTV for Twin Disc MG516 Marine Gear
Why Sealants Are Critical
Types of Sealants Used in MG516 Service
Sealant Type
Use Case
Best Practices: Using Gasket Sealants on MG516
Common Sealant Mistakes to Avoid
Pre-Startup Checks for Twin Disc MG516 Marine Gear
Pre-Startup Inspection Categories
Step-by-Step Final Inspection Checklist
✅ 1. Confirm All Fasteners Are Torqued
✅ 2. Oil Filled to Proper Level
✅ 3. New Filter Installed and Primed
✅ 4. Control Valve and Solenoids Connected
✅ 5. Rotate Transmission Manually (If Possible)
✅ 6. Inspect Seals and Breathers
✅ 7. Verify Alignment with Prop Shaft
✅ 8. Setup for Initial Start
Initial Startup Procedure
Pressure and Temperature Monitoring
Post-Startup Torque Recheck
Real-World Reassembly Oversights and Lessons
Example 1: Leaking Flange After Sea Trial
Example 2: Oil Starvation at Startup
Example 3: No Reverse After Rebuild
Final 30-Point Reassembly and Startup Checklist
Summary: Reassembly Tips and Best Practices for Twin Disc MG516 Marine Gear
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