Exhaust Manifold Cover Gasket – Fits Yanmar 3GM30 Series Marine Engines (Replaces 128370-13181)
Exhaust Manifold Cover Gasket – Fits Yanmar 3GM30 Series Marine Engines (Replaces 128370-13181) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Manifold Cover Gasket – Fits Yanmar 3GM30 Series Marine Eng...
Product Details
This high-quality Exhaust Manifold Cover Gasket – Fits Yanmar 3GM30 Series Marine Engines (Replaces 128370-13181) provides a leak-free seal between the exhaust manifold and its cover on Yanmar 3GM30 series marine diesel engines. It is engineered for a precise fit on models including the 3GM30, 3GM30F, 3GM30F-YEU, 3GM30VE, 3GM30B, and 3GM30C.
This part is a direct cross-reference for Yanmar part number 128370-13181.
- Engineered for direct OEM replacement installation.
- Formulated from durable, non-asbestos material for marine environments.
- Ensures a reliable, leak-free seal for the exhaust system.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yanmar | 128370-13180 | 128370-13181 |
| Yanmar | 128370-13181 |
Engine & Model Compatibility
Confirm your engine model in the table below.
This gasket is specifically designed for the following Yanmar 3GM30 series engines.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yanmar | 3GM30 | 27 | 4-Stroke | 128370-13181 | Supersedes 128370-13180 |
| Yanmar | 3GM30F | 27 | 4-Stroke | 128370-13181 | Freshwater cooled version |
| Yanmar | 3GM30F-YEU | 27 | 4-Stroke | 128370-13181 | |
| Yanmar | 3GM30VE | 30 | 4-Stroke | 128370-13181 | |
| Yanmar | 3GM30B | 27 | 4-Stroke | 128370-13181 | |
| Yanmar | 3GM30C | 27 | 4-Stroke | 128370-13181 |
Technical Specs
- Product Type
- Exhaust Manifold Cover Gasket
- Application
- Marine engines
- Installation
- Direct OEM replacement
- Fuel Type
- Diesel
- Material
- Non-asbestos gasket material
- Dimensions
- 24.5" L x 6.5" W x 0.1" H
- OEM Part Number
- 128370-13181
- Supersedes
- 128370-13180
What’s in the Box
- 1 x Exhaust Manifold Cover Gasket (Replaces 128370-13181)
Installation Notes
- Ensure the engine is off and completely cool before starting work. Disconnect the battery.
- Drain the engine coolant to a level below the exhaust manifold to prevent spills.
- Carefully remove any components blocking access to the exhaust manifold cover.
- Unbolt and remove the exhaust manifold cover, then peel off the old gasket.
- Thoroughly clean both mating surfaces. Use a plastic scraper and a suitable solvent to remove all old gasket material, carbon, and debris. Ensure surfaces are smooth and dry.
- Position the new gasket onto the manifold, aligning it with the bolt holes. Do not use sealant unless specified by your engine's service manual.
- Reinstall the cover and tighten the bolts in the sequence and to the torque values recommended by the manufacturer.
- Reconnect any components that were removed, refill the coolant, and reconnect the battery.
- Start the engine and carefully inspect for any coolant or exhaust leaks around the cover.
Troubleshooting & FAQ
How do I know if this gasket fits my engine?
This gasket is designed for Yanmar 3GM30 series engines. Please verify your specific model against the compatibility table provided on this page. Matching the OEM part number (128370-13181) is the most reliable way to ensure a correct fit.
What are the signs of a failing exhaust manifold cover gasket?
Common symptoms include visible coolant leaks around the manifold cover, engine overheating, white steam from the exhaust (as coolant burns off), or a drop in the coolant reservoir level without an obvious external leak.
Can I reuse my old gasket?
No. Gaskets are single-use components designed to compress and create a seal under specific pressure. Once used, they lose their ability to seal effectively and must be replaced.
Do I need to apply sealant to this gasket?
This gasket is typically designed for a dry installation. Applying sealant can sometimes interfere with proper sealing. Always follow the procedures outlined in your engine's official service manual for the most accurate guidance.
What is the difference between the superseded (128370-13180) and this new part?
The newer part number (128370-13181) typically represents a material update, often to a more durable or environmentally compliant non-asbestos composite. It is a direct, improved replacement for the older version.
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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