Anode Gasket – Fits Yanmar Marine Engines (Replaces 120650-18500)
Anode Gasket – Fits Yanmar Marine Engines (Replaces 120650-18500) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Anode Gasket – Fits Yanmar Marine Engines (Replaces 120650-18500)
Product Details
This Anode Gasket provides a crucial seal for the anode housing on various Yanmar 4-stroke marine diesel engines, including the 4BY and 6BY series. It is designed to prevent water ingress and ensure a secure fit, facilitating anode replacement without leakage risks.
This part is a direct replacement for Yanmar part number 120650-18500.
- Ensures a watertight seal between the anode and engine housing.
- Constructed from durable, marine-grade corrosion-resistant material.
- Facilitates reliable and leak-free anode replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 120650-18500 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This anode gasket is confirmed to fit various engines in Yanmar's 4BY and 6BY series.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 4BY Series | 4-Stroke | 120650-18500 | Anode gasket for ensuring sealing |
| Yanmar | 6BY Series | 4-Stroke | 120650-18500 | Anode gasket for ensuring sealing |
Technical Specs
- Product Type
- Anode Gasket
- Installation
- Engine Anode Housing
- Material
- Marine Corrosion-Resistant Material
- Function
- Ensures Tightness of Anode Housing
- Application
- Sealing Between Anode and Engine
- Primary Purpose
- Prevents Water Ingress
- Compatibility
- Yanmar Marine Engines
- Other Technical Attributes
- Facilitates Anode Replacement Without Leakage Risks
- Product Dimensions (L x W x H)
- 2.5 x 2.5 x 0.1 inches
What’s in the Box
- 1 x Gasket (120650-18500)
Installation Notes
- Shut down the engine and allow it to cool completely before starting work.
- Close the relevant seacock to prevent water from entering the vessel.
- Disconnect the vessel's battery to ensure no accidental starts.
- Locate and unbolt the engine anode housing.
- Remove the old anode and the worn-out gasket.
- Thoroughly clean the mating surfaces on both the engine block and the housing, removing any old sealant or corrosion.
- Position the new anode gasket correctly onto the housing.
- Install the new anode and re-secure the housing assembly, tightening bolts to the manufacturer's specified torque.
- Once secure, open the seacock.
- Reconnect the battery, start the engine, and carefully inspect the housing for any signs of water leaks.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific Yanmar model?
This gasket is compatible with Yanmar 4BY and 6BY series engines. The most reliable method of confirmation is to match the part number 120650-18500 with the one listed in your engine's service manual.
What is the function of an anode gasket?
The anode gasket creates a watertight seal between the sacrificial anode and the engine's cooling channels. A proper seal is critical to prevent coolant or raw water leakage, which can lead to engine damage or corrosion.
How often should this gasket be replaced?
It is best practice to replace the anode gasket every time you replace the engine anode. Anodes are sacrificial parts that protect the engine from corrosion and should be inspected and replaced regularly, typically annually or as specified in your engine's maintenance schedule.
What are the signs of a failing anode gasket?
Common signs include visible water drips or salt creep around the anode housing, or unexplained loss of coolant. Any evidence of a leak in this area warrants immediate inspection and replacement of the gasket.
Can I reuse the old gasket after replacing the anode?
No. Gaskets are single-use components that compress to create a seal. Reusing an old gasket significantly increases the risk of leaks and is not recommended.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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