Yanmar 128170-42120 Oil Seal for 1GM and 1GM10
The Yanmar 128170-42120 is the genuine replacement oil seal for 1GM and 1GM10 engines. It is a small part that decides whether the pump has a long life or a short one.
Inspect the shaft whenever the seal is out. A ridge or a polished groove where the old lip ran will cut a new seal quickly, so a marked shaft means the shaft should be dealt with too rather than sealing against it and hoping. Fit the new seal squarely, lip toward the water, and never tap directly on the lip.
Key Features
- Genuine Yanmar replacement oil seal
- Fits 1GM and 1GM10 engines
- One per pump
- Keeps raw water away from the pump bearing
- Dynamic seal running directly on the pump shaft
- Best replaced as a set with the other pump seals
Applications
- 1GM and 1GM10 engines
- Raw water pump rebuilds
- Curing a weep or salt crust at the pump drain
- Service before salt water reaches the bearing
- Repairing a pump after a bearing failure
- Spring commissioning and layup service
Specifications
- Brand: Yanmar
- Manufacturer: Yanmar Marine
- Manufacturer Part Number: 128170-42120
- Part Type: Oil Seal
- Fits: 1GM and 1GM10 engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: How often should seals be replaced?
Whenever the pump is apart far enough to reach them, and immediately if there is any sign of water tracking past them.
Q: There is salt crusting under the pump. Is the seal gone?
That is the classic sign. Water is passing the seal and evaporating on the outside. Deal with it early, because the next thing it reaches is the bearing.
Q: Can I fit a new seal to a worn shaft?
Not with much hope. A groove where the old lip ran gives the new one nothing flat to follow, and it will weep again quickly.
Q: Which way round does the seal go?
Lip toward the water it is sealing, so pressure pushes the lip against the shaft rather than away from it. Note the orientation of the old one before it comes out.
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 oil seal.
CLRMarine
