Valve Cover Gasket – Fits Yanmar 1GM/1GM10 Marine Engines (Replaces 128170-11310)
Valve Cover Gasket – Fits Yanmar 1GM/1GM10 Marine Engines (Replaces 128170-11310) 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
Valve Cover Gasket – Fits Yanmar 1GM/1GM10 Marine Engines (Replaces...
Product Details
This high-quality Valve Cover Gasket is engineered to provide a reliable seal for the valve cover on Yanmar 1GM and 1GM10 series marine diesel engines, covering models manufactured between 1981 and 2005. It prevents oil leaks and ensures your engine runs cleanly and efficiently.
It serves as a direct replacement for Yanmar OEM part number 128170-11310.
- Installation Method: Direct replacement for a seamless fit.
- Operating Environment: Designed for marine diesel engines.
- Primary Function: Creates a secure seal to prevent oil leakage from the valve cover.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 128170-11310 | Original Equipment Manufacturer |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
The following table lists compatible Yanmar engine models. Ensure your specific model is listed before purchasing.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yanmar | 1GM | 7 | 4-Stroke | 1981–1983 | 128170-11310 | |
| Yanmar | 1GM10 | 9 | 4-Stroke | 1981–2005 | 128170-11310 | |
| Yanmar | 1GM10C | 9 | 4-Stroke | 1981–2005 | 128170-11310 | |
| Yanmar | 1GM10L | 9 | 4-Stroke | 1981–2005 | 128170-11310 | |
| Yanmar | 1GM10VE | 9 | 4-Stroke | 1981–2005 | 128170-11310 | |
| Yanmar | 1GM10(YMI) | 9 | 4-Stroke | 1981–2005 | 128170-11310 |
Technical Specs
- Product Type
- Valve Cover Gasket
- Housing Material
- Rubber/Cork Composite
- Fuel Type
- Diesel
- Installation
- Direct replacement
- Dimensions
- 10.0" L x 12.0" W x 0.1" H
What’s in the Box
- 1 x Valve Cover Gasket (Replaces 128170-11310)
Installation Notes
- Ensure the engine is cool. Disconnect the battery.
- Clean the area around the valve cover to prevent debris from entering the engine.
- Remove any components obstructing access to the valve cover bolts (e.g., intakes, wires).
- Loosen and remove the valve cover bolts in a crisscross pattern to prevent warping.
- Carefully lift the valve cover. If it is stuck, gently tap it with a rubber mallet.
- Remove the old gasket and thoroughly clean any residual gasket material and oil from both the cylinder head and the valve cover mating surfaces.
- Install the new gasket onto the valve cover, ensuring it is seated correctly in the groove.
- Place the valve cover back onto the cylinder head and hand-tighten the bolts.
- Torque the bolts to the manufacturer's specified value and sequence. Do not overtighten.
- Reinstall any components that were removed and reconnect the battery.
- Start the engine and check for any oil leaks around the valve cover.
Troubleshooting & FAQ
What are the signs of a failing valve cover gasket?
Common signs include visible oil leaks around the valve cover, a burning oil smell from oil dripping onto hot engine parts, and a lower-than-normal engine oil level.
Will this gasket fit a Yanmar 1GM engine made before 1981?
This gasket is specified for Yanmar 1GM models from 1981–1983 and 1GM10 models from 1981–2005. For models outside this range, please verify the part number 128170-11310 against your engine's service manual.
Do I need to use gasket sealant with this part?
Typically, modern composite gaskets like this one are designed to be installed dry. However, applying a thin layer of RTV sealant at sharp corners is a common practice. Always consult your engine's service manual for specific recommendations.
What can cause a new valve cover gasket to leak after installation?
Leaks after installing a new gasket are often caused by improper installation. Common reasons include unevenly torqued bolts (too loose or too tight), a warped valve cover, or contaminated mating surfaces that were not cleaned properly before installation.
What is the difference between this gasket and the OEM Yanmar part?
This part is an aftermarket replacement engineered to meet or exceed original equipment specifications. It is made from a comparable high-quality rubber/cork composite to ensure a durable and long-lasting seal, offering OEM performance at a better value.
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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