Yanmar 124772-42130 Impeller Shaft
The Yanmar 124772-42130 is the genuine impeller shaft for Yanmar marine diesel sea water pumps that use this part. It carries the drive from the engine into the impeller, and it is the surface the pump seals run on, which means its condition decides how long a set of seals will last.
A shaft is replaced for wear at the seal, for corrosion, or for damage at the impeller drive. The seal area is the one that matters most: once the lip has worn a groove into the shaft, a new seal has nothing flat to follow and will weep within hours. Run a fingernail along it - if you can feel a step, the shaft is finished as a sealing surface however good it looks.
Key Features
- Genuine Yanmar replacement impeller shaft
- Fits Yanmar marine diesel sea water pumps that use this part
- 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
- Yanmar marine diesel sea water pumps that use this part
- 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: 124772-42130
- Part Type: Impeller Shaft
- Fits: Yanmar marine diesel sea water pumps that use this part
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
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.
Q: Should I replace the bearing at the same time?
Check it. A shaft that has worn unevenly usually did so because the bearing allowed movement, and fitting a new shaft into a tired bearing repeats the wear.
Q: Why does the shaft corrode?
Salt water that has been past a failed seal sits against it. That is why a weeping seal is worth dealing with early rather than at the next service.
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 impeller shaft.
CLRMarine
