Yanmar 129670-42513-J Sea Water Cooling Pump for 3JH and 4JH
The Yanmar 129670-42513-J is the genuine replacement sea water cooling pump for 3JH3, 4JH3 and 4JH4 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 sea water cooling pump
- Fits 3JH3, 4JH3 and 4JH4 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
- 3JH3, 4JH3 and 4JH4 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: 129670-42513-J
- Part Type: Sea Water Cooling Pump
- Fits: 3JH3, 4JH3 and 4JH4 Series engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
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.
Q: Is a spare pump worth carrying?
On a boat that goes offshore, yes. A pump can be changed at sea in reasonable conditions, while a body that has failed cannot be repaired with what is aboard.
Q: What should I check after fitting?
Run the engine at the dock and watch the exhaust stream, then check the joint faces for weeping once everything is up to temperature and has cooled again.
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.
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 cooling pump.
CLRMarine
