Yanmar 128170-42200 Bronze Raw Water Cooling Pump for 1GM and 1GM10
The Yanmar 128170-42200 is the factory bronze raw water cooling pump for 1GM and 1GM10 engines. It is driven directly by the engine, so it turns whenever the engine turns, and everything downstream of it in the cooling circuit depends on it holding its output.
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 raw water cooling pump
- Fits 1GM and 1GM10 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
- 1GM and 1GM10 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: 128170-42200
- Part Type: Bronze Raw Water Cooling Pump
- Fits: 1GM and 1GM10 engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
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.
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.
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 raw water cooling pump.
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