Yanmar 119578-42581 Port O-Ring for 6LY3
The Yanmar 119578-42581 is the factory port o-ring used in 6LY3 Series engines. In a pump that runs in salt water, an inexpensive elastomer seal is what stands between an ordinary service and a corrosion problem.
O-rings fail predictably. Heat and time take the flexibility out of the rubber, the ring takes a permanent set in the shape of its groove, and it stops pushing back against the surfaces it seals. On a raw water pump the consequence is either a leak to the outside, which is obvious, or air drawn in on the suction side, which is not obvious at all - the pump simply stops making the flow it used to.
Key Features
- Genuine Yanmar replacement port o-ring
- Fits 6LY3 Series engines
- One per pump
- Restores a positive seal at the joint
- Prevents both leaks and air being drawn in on the suction side
- Inexpensive part worth renewing whenever the joint is opened
Applications
- 6LY3 Series engines
- Raw water pump rebuilds and impeller changes
- Curing a leak or a weep at a pump joint
- Tracing air drawn into the suction side
- Reassembly after any joint in the pump is opened
- Spring commissioning and layup service
Specifications
- Brand: Yanmar
- Manufacturer: Yanmar Marine
- Manufacturer Part Number: 119578-42581
- Part Type: Port O-Ring
- Fits: 6LY3 Series engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: What makes an O-ring swell?
Absorption of whatever it is sealing, or contact with a fluid the material was not chosen for. A ring noticeably larger than the new one is telling you something is wrong.
Q: Does a cover O-ring differ from a port O-ring?
They seal different joints and are not interchangeable. Both are static seals, but each is sized for its own groove.
Q: Can I reuse an O-ring that looks fine?
It is a false economy. A ring compressed for a season has taken a set in its groove and no longer springs back, and it will often seal on the bench and leak once the engine is running.
Q: The pump does not leak but the flow has dropped. Could a seal be responsible?
Yes. A seal on the suction side lets air in rather than water out, so there is nothing to see while the pump quietly loses its ability to prime and pull.
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 port o-ring.
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