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
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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
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April 1, 2025
Introduction
Clutch Pack Inspection for Twin Disc MG516 Marine Gear
When to Inspect the Clutch Packs
Tools and Supplies You’ll Need
Accessing the Clutch Packs
Understanding the Clutch Stack
Wear Indicators to Watch For
Measuring Clutch Pack Clearance
Reassembly Tips
Break-In Procedure for New Clutches
Gear Train and Tooth Wear Inspection for Twin Disc MG516 Marine Gear
When to Inspect Gears
Components in the Gear Train
Gear Tooth Wear Types and Identification
How to Inspect Gear Condition
Gear Pitch and Contact Pattern Testing
Measuring Gear Backlash in Twin Disc MG516 Marine Gear
Tools Required
Measurement Procedure
Typical Backlash Tolerance
What Causes Backlash Problems?
Gear and Shaft Inspection Best Practices
Shaft Endplay Measurement
Bearing and Race Inspection
Rebuilding the Gear Train
Real-World Gear Failure Examples
Case Study 1: Offshore Crew Boat with Metallic Noise
Case Study 2: Trawler with Gearbox Overheating
Maintenance Intervals for Gear and Clutch Inspection
Final Inspection Checklist
Summary: Why Clutch and Gear Inspection Matters
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April 1, 2025
Introduction
Overview of the Hydraulic System in MG516 Marine Gear
Checking Operating Pressure for Twin Disc MG516 Marine Gear
When to Perform a Pressure Test
Tools Needed
Step-by-Step Procedure to Check Hydraulic Pressure
Slow engagement = worn clutch piston seals or pressure leak
What Pressure Deviations Mean
After Testing
Replacing Hydraulic Seals for Twin Disc MG516 Marine Gear
Common Hydraulic Seals in the MG516
Symptoms of Failing Hydraulic Seals
Tools and Supplies for Seal Replacement
General Replacement Procedure (Clutch Piston Seals)
Preventative Tips for Extending Seal Life
Advanced Troubleshooting and Diagnostics For Twin Disc MG516 Marine Gears
Real-World Scenarios
Example 1: Tugboat with Delayed Reverse Engagement
Example 2: Crew Boat Overheating in Forward Gear
Final Checklist After Servicing Hydraulic System
Summary: Servicing the Hydraulic System in MG516 Marine Gear
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April 1, 2025
Introduction
Draining Procedures for Twin Disc MG516 Marine Gear
Tools and Supplies You’ll Need
Step-by-Step Draining Instructions
Refilling Procedures for Twin Disc MG516 Marine Gear
Recommended Oil Type
Step-by-Step Refilling Instructions
Troubleshooting Refill Problems
⚠️ Overfilled Oil
⚠️ Underfilled Oil
⚠️ Milky or Cloudy Oil
⚠️ Foamy Oil
Safety Tips and Best Practices
Maintenance Enhancements
Environmental Responsibility
Summary: Drain and Refill for Long-Term Reliability
Videos About Twin Disc Transmissions
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