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
Videos About Twin Disc Transmissions
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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:
Videos About Twin Disc Transmissions
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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
Videos About Twin Disc Transmissions
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April 1, 2025
Introduction
Overview: How the MG516 Control Valve Works
Solenoid and Valve Cleaning for Twin Disc MG516 Marine Gear
When to Service the Valve Assembly
Components in the Control Valve System
Tools and Supplies Needed
Step-by-Step: Solenoid and Valve Removal
Cleaning Procedures
Reassembly Tips
Testing Shifting Operation for Twin Disc MG516 Marine Gear
Manual Shift Control Systems
How to Troubleshoot Manual Shifting
Electronic Shift Control Systems
Common Electronic Shift Faults
Symptom
Probable Cause
Step-by-Step Electronic Diagnostics
Simulating Manual Shift
Preventative Maintenance for Control Valve System
Control Valve Rebuild Kits and Replacement Parts
Real-World Shift Troubleshooting Examples
Case Study 1: Commercial Ferry Stuck in Neutral
Case Study 2: Trawler with Delayed Reverse
Case Study 3: Gearbox Slams Into Gear
Final Post-Service Checklist
Summary: Control Valve Maintenance for Twin Disc MG516 Marine Gear
Videos About Twin Disc Transmissions
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April 1, 2025
Introduction
Overview of the MG516 Oil Circulation and Cooling System
Key Components:
How Oil Flows Through the MG516 System
Heat Exchanger Inspection for Twin Disc MG516 Marine Gear
When to Inspect or Service the Heat Exchanger
Tools and Supplies Needed
Inspection Procedure: External and Visual
Disassembly and Internal Cleaning
Oil Flow Testing for Twin Disc MG516 Marine Gear
When to Perform an Oil Flow Test
Tools You’ll Need
Flow Test Locations (MG516)
Acceptable Flow Rates (Typical)
Oil Flow Testing Procedure
Diagnosing Poor Oil Flow
Corrective Actions
Preventative Cooling System Maintenance Tips
Warning Signs of Cooling System Trouble
Case Studies and Field Examples
Case Study 1: Trawler with Intermittent Overheating
Case Study 2: Charter Vessel with Low Flow at Idle
Final Checklist for Cooling System Service
Summary: Cooling and Oil Circulation System for MG516 Marine Gear
Videos About Twin Disc Transmissions
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April 1, 2025
Introduction
Rear Output Assembly Overview for Twin Disc MG516 Marine Gear
Bearing and Seal Inspection for Twin Disc MG516 Marine Gear
When to Inspect the Output Shaft Bearings and Seal
Tools and Supplies Needed
Rear Bearing Types and Function
How to Inspect Output Shaft Bearings
When to Replace Bearings
Output Shaft Seal Inspection and Replacement
Signs of Seal Failure
How to Replace the Output Shaft Seal
Preventing Premature Seal Wear
Shaft Alignment and Runout for Twin Disc MG516 Marine Gear
Why Alignment Matters
Measuring Shaft Runout
Shaft Alignment to Propeller Shaft
Real-World Failures Due to Neglected Rear Housing Maintenance
Case Study 1: Tugboat Output Seal Leak
Case Study 2: Vibrating Crew Boat at Cruise Speed
Rear Housing Reassembly Tips
Final Inspection Checklist
Summary: Output Shaft and Rear Housing Maintenance for Twin Disc MG516 Marine Gear
Videos About Twin Disc Transmissions
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