Yanmar 124070-42420 Pulley Washer for 2GM and 3GM
The Yanmar 124070-42420 is the genuine pulley washer for the sea water pump fitted to 2GM and 3GM Series engines. It is not ordinary hardware: the grade, the length and the material are chosen for a fastener that lives in salt water and holds a joint that has to stay sealed.
Substituting hardware store items is a poor idea here. The wrong material sets up corrosion between dissimilar metals, the wrong length bottoms out before it clamps, and the wrong grade stretches. Keep a few spares with the impeller kit and the problem does not arise.
Key Features
- Genuine Yanmar replacement pulley washer
- Fits the sea water pump fitted to 2GM and 3GM Series engines
- One per pump
- Correct grade, length and material for a salt water joint
- Replaces corroded, seized or rounded hardware
- Worth keeping spares with the impeller kit
Applications
- the sea water pump fitted to 2GM and 3GM Series engines
- Raw water pump rebuilds and impeller changes
- Replacing corroded or rounded off hardware
- Making up a complete set after a strip down
- Marine installations where salt attacks fasteners first
- Spring commissioning and layup service
Specifications
- Brand: Yanmar
- Manufacturer: Yanmar Marine
- Manufacturer Part Number: 124070-42420
- Part Type: Pulley Washer
- Fits: The sea water pump fitted to 2GM and 3GM Series engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: How tight should cover screws be?
Snug and even in a cross pattern. Overtightening bows the cover, which is one of the most common causes of a pump drawing air.
Q: Is it worth replacing them all at once?
If several are corroded, yes. A mix of new and tired hardware clamps unevenly, and the old ones will need doing at the next service anyway.
Q: Why does the pump hardware corrode faster than the rest of the engine?
It is in the wettest place on the engine, often in contact with a dissimilar metal, and it gets washed with salt water every time the pump is opened.
Q: Can I use a stainless fastener from the hardware store?
It is a gamble. Material, grade and length are all chosen for the joint, and the wrong material in a dissimilar metal housing sets up corrosion that seizes the thread.
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 pulley washer.
CLRMarine
