Yanmar 128377-42501 Sea Water Pump for GM and GMF
The Yanmar 128377-42501 is the genuine replacement sea water pump for the bronze sea water pump fitted to GM and GMF Series engines. It is the heart of the raw water side of the cooling system and the one component an engine cannot run without for long.
The usual history is the same. A seal starts weeping, salt water gets past it into the bearing, the bearing goes rough, the shaft starts to move, and the impeller and wear plate wear unevenly because of it. Each step is repairable on its own, but by the time the pump is noisy or the telltale is weak, several of them have happened together.
Key Features
- Genuine Yanmar replacement sea water pump
- Fits the bronze sea water pump fitted to GM and GMF Series engines
- Engine driven, no separate power supply needed
- Restores full raw water flow to the cooling circuit
- One per pump
- Direct fit replacement using the original mounting
Applications
- the bronze sea water pump fitted to GM and GMF Series engines
- Replacing a pump with a corroded or pitted body
- Repairing a pump whose bearing has taken salt water
- Restoring cooling after repeated overheat alarms
- Repower and engine refit work
- Keeping a complete spare aboard for long passages
Specifications
- Brand: Yanmar
- Manufacturer: Yanmar Marine
- Manufacturer Part Number: 128377-42501
- Part Type: Sea Water Pump
- Fits: The bronze sea water pump fitted to GM and GMF Series engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: Does a new pump come ready to run?
It is a complete assembly, but check the impeller and the drive before fitting, and prime the raw water side by opening the seacock and letting the strainer fill.
Q: How do I know the pump needs replacing rather than rebuilding?
When more than one thing is wrong at once - a pitted body, a scored shaft and a rough bearing together. Any one of those is a repair; all three mean the pump has reached the end of its service life.
Q: What are the warning signs before it fails?
A weak exhaust stream, salt crusting or a weep at the pump drain, a rumble or growl that changes with engine speed, and temperatures that creep up under load.
Q: Should I replace the gasket when fitting it?
Always. The mounting joint has been disturbed, the old gasket has taken a set, and a leak there is both a coolant loss and a corrosion problem.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct sea water pump.
CLRMarine
