Description
Yanmar 121450-11310 Valve Cover Gasket – OEM Replacement for 3GM Series Marine Engines
The Yanmar 121450-11310 Valve Cover Gasket is a high-quality OEM replacement gasket designed for Yanmar 3GM-series marine diesel engines, including 3GM, 3GM30, 3GM30F, 3GMD, and related models. It provides a tight, oil-resistant seal between the valve cover and cylinder head, preventing leaks and protecting internal components from contamination.
Built from durable rubber/composite materials, this gasket ensures long-lasting performance under marine conditions. It’s an essential part for top-end service, valve adjustments, or engine rebuilds, helping maintain clean, efficient, and reliable engine operation.
⚙️ Compatibility
Compatible with the following Yanmar marine engines:
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3GM
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3GM30
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3GM30F
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3GM30YEU
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3GM30FC
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3GMD
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3GMD-YEU
(Always verify your engine model and serial number before ordering.)
📦 Technical Details
| Specification | Detail |
|---|---|
| Part Number | 121450-11310 |
| Type | Valve Cover (Bonnet) Gasket |
| Material | Rubber / composite for oil resistance |
| Condition | New, OEM replacement |
| Compatibility | Yanmar 3GM-series engines |
💡 When to Replace
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Oil leaks around the valve cover
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Oil residue on cylinder head or block
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During valve adjustments, top-end service, or rebuilds
✅ Why Choose This OEM Replacement Gasket
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Perfect fit designed to meet Yanmar specifications
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High-quality rubber/composite materials for long service life
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Cost-effective alternative to OEM gaskets
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Simple installation with basic tools
🛒 Available at MarinePartSystem
Order the Yanmar 121450-11310 Valve Cover Gasket (OEM Replacement) today from MarinePartSystem, your trusted supplier of Yanmar marine engine parts.






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