Yanmar 104211-42100 Lip Seal for 2GM and 3GM
The Yanmar 104211-42100 is the genuine lip seal for the sea water pump fitted to 2GM and 3GM Series engines. It runs against the turning pump shaft and keeps raw water on the water side of the pump, away from the bearing behind it.
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 lip seal
- Fits the sea water pump fitted to 2GM and 3GM Series 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
- the sea water pump fitted to 2GM and 3GM Series 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: 104211-42100
- Part Type: Lip Seal
- Fits: The sea water pump fitted to 2GM and 3GM Series engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: Why are there two seals in the pump?
One keeps water in, the other keeps bearing lubrication in, and the space between them vents through the drain so a failure shows outside instead of contaminating the bearing.
Q: How do I fit it without damage?
Support it squarely and press on the outer face, never on the lip. Most seals that leak straight after a rebuild were damaged or cocked on the way in.
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.
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 lip seal.
CLRMarine
