July 21, 2025
Introduction
The Role of Connecting Rod Bearings in Marine Diesel Engines
How Marine Operation Accelerates Bearing Stress
Common Causes of Bearing Failure in Marine Diesel Engines
Inadequate Lubrication
Contaminated Oil
Improper Engine Rebuilds or Assembly Errors
Hydrodynamic Oil Film Collapse
Debris and Foreign Material
Warning Signs of Bearing Failure in Marine Engines
Low or Fluctuating Oil Pressure
Metallic Knocking or Thudding Sound
Oil Analysis Reveals Elevated Metal Particles
Overheating and Loss of Power
Case Studies: Real-World Failures in Key Marine Diesel Platforms
Detroit Diesel 6-71 and 8V92 Marine Engines
Cummins 6CTA 8.3 and KTA19/KTA38
Caterpillar 3406 and 3500 Marine Engines
Preventing Connecting Rod Bearing Failures
Follow OEM or Aftermarket Specifications Precisely
Maintain Oil Quality and Change Intervals
Install Oil Pressure and Temperature Alarms
Use a Proper Break-In Procedure
The Aftermath: What Happens When Bearings Fail?
Spun Bearings
Thrust Bearing Failure
Crankshaft Damage
Expert Tips for Marine Diesel Technicians
Final Thoughts
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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
The Detroit Diesel 16V149: The Ultimate Heavy-Duty Engine
What Makes the 16V149 Special
Where You’ll Find These Titans
Why Finding Overhaul Kits for the 16V149 is Practically Impossible
The Engine is Out of Regular Production
Turbo vs. Non-Turbo Adds Another Layer of Difficulty
The Diesel Pro Power Difference: One of the Only Companies in the World With These Kits In Stock
Why This Matters: The Real Cost of Downtime
What’s Actually In Our 16V149 Overhaul Kits
Each Diesel Pro Power 16V149 Kit Includes:
Why Most Companies Don’t Stock These Kits — and Why We Do
The Financial Risk is Too Big for Most Distributors
It’s Logistically Complex
Turbocharged vs. Non-Turbo: We Stock Both — Because They’re Not the Same
Trusted By Marine and Industrial Operators Worldwide
Technical Expertise You Won’t Find Anywhere Else
Two-Stroke Engine Demands
Compression Matching
Fast Shipping, Worldwide — Because Downtime is the Real Enemy
Protect Your Rebuild — Why We Only Use Premium Components
Conclusion: The Only Real Choice for Detroit Diesel 16V149 Overhauls
Other Parts Diesel Pro Power Carries For The Detroit Diesel 16V149
Additional Resources For The Detroit Diesel 149 Series
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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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