July 17, 2025
Introduction
What’s Included in a Standard Rebuild Kit For Allison M & MH Marine Transmissions
Clutch-Related Components
Gaskets and Seals
Bearings and Bushings
Hardware
Advantages of Aftermarket Parts Over OEM
Common Wear and Replacement Parts
Clutch Components
Bearings
Seals and Rings
Thrust Washers
Gaskets and Fasteners
Recommended Fluids and Filter Replacements
Transmission Models Supported
M Series
MH Series
How to Identify the Correct Rebuild Kit
Additional Parts Available at Diesel Pro Power
FAQ – Frequently Asked Questions
Additional Resources for Allison M & MH Marine Transmissions
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July 17, 2025
Introduction
1. Manual & Tools – Essential Reference and Equipment
2. Rebuilt Allison M & MH Gears – When to Replace the Entire Transmission
3. Overhaul Kit – Complete Seal and Gasket Replacement
4. Individual Seals – Fixing Localized Leaks
5. Clutch Plate – Worn or Burnt Clutches
6. Hydraulic Pump – Pressure Delivery System
7. Selector Valve & More – Control System Component
8. Transmission Bearings – Reducing Friction and Load Support
9. Sleeve, Ring – Shaft Support and Load Distribution
10. Locknut – Retaining Components Under Torque
11. Washer – Load Spreading and Thrust Control
12. Oil Strainer – Protecting the Hydraulic System
13. Spring & Bolt – Clutch and Valve Assemblies
14. Oil Cooler & Filter – Managing Heat and Cleanliness
15. Coupling – Connecting the Propeller Shaft
Final Notes On Component Replacement
When to Choose Individual Parts vs. Rebuild Kits
Conclusion
Additional Resources for Allison M & MH Marine Transmissions
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July 17, 2025
Introduction
General Operation FAQs For Allison M & MH Marine Transmissions
1. What do the designations "M" and "MH" mean?
2. What types of gear reductions are available?
3. Can these transmissions accommodate both left-hand and right-hand engine rotation?
4. Are these transmissions suitable for both pleasure and commercial vessels?
5. What kind of clutches are used?
Installation and Setup FAQs For Allison M & MH Marine Transmissions
6. How is the transmission mounted?
7. Does the transmission use the same oil as the engine?
8. What is the oil capacity?
9. Where is the oil dipstick located?
10. What type of oil filter is used?
Operation and Usage FAQs For Allison M & MH Marine Transmissions
11. Can you shift from forward to reverse at any speed?
12. What happens if I try to tow the boat with the engine off?
13. Is full torque shifting recommended?
14. What does the selector valve do?
15. How is the selector valve actuated?
Maintenance FAQs For Allison M & MH Marine Transmissions
16. How often should the oil be changed?
17. What is the correct oil level check procedure?
18. What are signs of oil contamination?
19. Can I reuse oil if it looks clean?
20. How should I store a transmission long-term?
Emergency Use and Troubleshooting FAQs For Allison M & MH Marine Transmissions
21. What is the "Get Home" emergency feature?
22. Can I engage reverse in emergency mode?
23. What should I do if the oil pressure is low?
24. Why is the transmission overheating?
25. What are symptoms of worn clutch plates?
Disassembly and Overhaul FAQs For Allison M & MH Marine Transmissions
26. Are special tools required to overhaul the transmission?
27. What parts are typically replaced during a rebuild?
28. What bearing inspection criteria should I follow?
29. Can I reuse clutch plates?
30. How do I clean and inspect oil passages?
Technical Specifications FAQs For Allison M & MH Marine Transmissions
31. What is the max input torque rating?
32. What’s the max input speed?
33. What is the oil pressure in forward?
34. What is the oil pressure in reverse?
35. What are the recommended shaft horsepower limits?
Torque, Fasteners & Assembly FAQs For Allison M & MH Marine Transmissions
36. What torque spec is used for the output flange nut?
37. Are spanner nuts used?
38. How is backlash adjusted?
39. Should I reuse a staked nut?
40. Is Loctite or thread sealant recommended?
Clutch and Hydraulic System FAQs For Allison M & MH Marine Transmissions
41. How are the clutches engaged?
42. What happens if a dump valve fails?
43. Are clutches adjustable?
44. Can I rebuild the flywheel clutch?
45. How does the hydraulic system work?
Identification & Model-Specific FAQs For Allison M & MH Marine Transmissions
46. Where is the serial number located?
47. What does the “R” in MH25R mean?
48. Can I upgrade from an M to an MH model?
49. Is there a parts catalog available?
50. Where can I find overhaul procedures?
Closing Note
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July 16, 2025
Why Diesel Pro Power is the Only True Source for Detroit Diesel 12V149 Overhaul Kits — In Stock and Ready to Ship
The Detroit Diesel 12V149: A Legend of Industrial Power
Key Specs That Made History
Where You’ll Find Them Today
Why the 12V149 is So Difficult to Support
These Engines are Rare and Out of Regular Production
Turbo and Non-Turbo Differences Add Complexity
Why Diesel Pro Power is Different: The World’s True Stocking Source
Why This Matters for Your Operation
What’s Inside Our Detroit Diesel 12V149 Overhaul Kits
Premium Components Include:
Turbo vs. Non-Turbo: We Stock Both
Why Most Companies Can’t — or Won’t — Stock These Kits
Enormous Inventory Risk
Complex Global Logistics
The Diesel Pro Power Difference: Why We’re Trusted Worldwide
Actual In-Stock Inventory
Fast Shipping, Global Reach
Unmatched Technical Support
Avoid the Disaster of Mismatched or Delayed Kits
Serving the World’s Most Demanding Industries
A Few Words on Why We Only Stock Premium Kits
Conclusion: If You Operate a Detroit Diesel 12V149, You Can’t Afford to Wait
Other Parts That We Carry For Detroit Diesel 12V149
Additional Resources For The Detroit Diesel 12V149
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June 2, 2025
Overview
Twin Disc MG520 Ratios for Sale
Specifications, Dimensions, and Options
Key Features and Benefits
Engine Compatibility For The Twin Disc MG520
MTU Engines
John Deere, MAN, Scania, and Volvo Penta
Why Engine Compatibility Matters
Service Classifications
Important Notice
Videos About Twin Disc Transmissions
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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
Videos About Twin Disc Transmissions
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