Yanmar 129573-42502 Bronze Sea Water Cooling Pump for 4JH3
The Yanmar 129573-42502 is the genuine replacement bronze sea water cooling pump for 4JH3 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.
Fit it with a clean joint face and a new mounting gasket, check the drive engages properly before the fasteners are tightened, and run the engine at the dock watching the exhaust stream before you rely on it. A cooling pump is one of the few components where a quiet failure at sea turns straight into a serious problem.
Key Features
- Genuine Yanmar replacement bronze sea water cooling pump
- Fits 4JH3 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
- 4JH3 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: 129573-42502
- Part Type: Bronze Sea Water Cooling Pump
- Fits: 4JH3 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 bronze sea water cooling pump.
CLRMarine
