Yanmar 124070-42061 Pump Shaft for 2GM and 3GM
The Yanmar 124070-42061 is the factory pump shaft used in the sea water pump fitted to 2GM and 3GM Series engines. It does two jobs at once: transmitting torque to the impeller and providing a ground, true running surface for the seals around it.
Corrosion is the marine version of the same problem. Salt water that has been past a failed seal pits the shaft along its length, and a pitted shaft destroys new seals as fast as they are fitted. The keyway or drive flats are the third area to check, because a worn drive lets the impeller move on the shaft and that movement shows up as uneven vane wear.
Key Features
- Genuine Yanmar replacement pump shaft
- Fits the sea water pump fitted to 2GM and 3GM Series engines
- One per pump
- Ground sealing surface for correct seal life
- Carries the drive from the engine into the impeller
- Renew the pump seals at the same time
Applications
- the sea water pump fitted to 2GM and 3GM Series engines
- Raw water pump rebuilds
- Replacing a shaft grooved where the seal runs
- Repairing corrosion after salt water past a failed seal
- Restoring a worn impeller drive
- Spring commissioning and layup service
Specifications
- Brand: Yanmar
- Manufacturer: Yanmar Marine
- Manufacturer Part Number: 124070-42061
- Part Type: Pump Shaft
- Fits: The sea water pump fitted to 2GM and 3GM Series engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: Does the impeller drive matter?
Very much. A worn keyway or drive flat lets the impeller move on the shaft, which wears the vanes unevenly and eventually rounds off the drive altogether.
Q: Do I need special tools?
A press or a suitable puller makes the job straightforward. Driving a shaft in or out with hammer blows damages the bearing and the seal bores.
Q: How do I know the shaft needs replacing?
Run a fingernail along the area the seal runs on. Any ridge or groove you can feel means a new seal cannot follow it, and the pump will weep again quickly.
Q: Can I sleeve or polish a grooved shaft?
Polishing removes material and moves the sealing diameter, which is not what you want on a part this size. Replacement is the reliable answer.
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 pump shaft.
CLRMarine
