Yanmar 104211-42090 Cover Gasket for 2GM and 3GM
The Yanmar 104211-42090 is the genuine replacement cover gasket for the sea water pump fitted to 2GM and 3GM Series engines. It goes between two machined faces and keeps what is behind them where it belongs.
A gasket takes a set in the joint and usually sticks to one face, so it almost always tears on disassembly. Replacing rather than reusing is not a preference, it is the practical reality of opening the joint. Clean both faces back to bare metal with a plastic scraper before the new one goes on, and check for scoring across the joint while you are there.
Key Features
- Genuine Yanmar replacement cover gasket
- Fits the sea water pump fitted to 2GM and 3GM Series engines
- One per pump
- Cut to the factory port pattern so passages line up
- Restores a positive seal between machined faces
- Inexpensive part that prevents joint corrosion
Applications
- the sea water pump fitted to 2GM and 3GM Series engines
- Raw water pump rebuilds and impeller changes
- Reassembly after any pump joint is opened
- Curing a weep at a mounting or port joint
- Replacing a pump on the engine
- Spring commissioning and layup service
Specifications
- Brand: Yanmar
- Manufacturer: Yanmar Marine
- Manufacturer Part Number: 104211-42090
- Part Type: Cover Gasket
- Fits: The sea water pump fitted to 2GM and 3GM Series engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: Is a mounting gasket different from a port gasket?
They seal different joints and are cut differently. Both should be renewed whenever their joint is disturbed.
Q: Can I reuse a gasket that came off in one piece?
It has taken a set in the joint and lost the compression it needs to seal. On a salt water joint that is how corrosion starts between the faces.
Q: Does it matter which way round it goes?
Yes. The holes match the port pattern and are often not symmetrical, so a gasket fitted reversed can block a water passage.
Q: Should I use sealant as well?
No. The joint is designed to seal on the gasket alone, and sealant squeezed into a water passage creates a fault that is very hard to find later.
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 cover gasket.
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