Cylinder Head Gasket – Fits Yanmar 1GM10 9HP Marine Diesel Engine (Replaces 128171-01911)
Cylinder Head Gasket – Fits Yanmar 1GM10 9HP Marine Diesel Engine (Replaces 128171-01911) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Yanmar 1GM10 9HP Marine Diesel Engine (...
Product Details
This is a high-quality aftermarket Cylinder Head Gasket – Fits Yanmar 1GM10 9HP Marine Diesel Engine, designed for a precise seal on 4-stroke marine diesel engines. It is engineered specifically for the Yanmar 1GM10 9HP model, ensuring reliable performance and durability in the demanding marine environment.
This part serves as a direct replacement for Yanmar part numbers 128171-01911 and 128171-01330, as well as Sierra 18-55601, providing a reliable interchange for maintenance and repairs.
- Installs between the engine block and cylinder head.
- Engineered for use with diesel fuel systems.
- Features a larger bore specifically for the 1GM10 model, and does not fit the earlier 1GM engine.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 128171-01911 |
| Yanmar | 128171-01330 |
| Sierra | 18-55601 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yanmar | 1GM10 | 9 | 4-Stroke | 128171-01911 | Does not fit 1GM model |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Engine Cylinder Head
- Fuel Type
- Diesel
- Housing Material
- Heat-resistant composite material
- Product Dimensions
- 18.5" L x 14.5" W x 3.0" H
- Weight
- 0.06 lbs (0.027 kg)
- Other Technical Attributes
- Larger bore compared to 1GM model gasket
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 128171-01911 / 128171-01330)
Installation Notes
For a successful installation, follow the service manual for your Yanmar 1GM10 engine. The general steps are:
- Disconnect the battery and drain the engine coolant completely.
- Remove all components attached to the cylinder head, such as the exhaust manifold, intake, and fuel lines. Label all connections to ensure correct reassembly.
- Loosen and remove the cylinder head bolts in the sequence specified in your engine's service manual to prevent warping.
- Carefully lift the cylinder head off the engine block. Remove the old head gasket.
- Thoroughly clean both the engine block and cylinder head mating surfaces. Ensure they are free of any old gasket material, carbon deposits, oil, and coolant.
- Place the new head gasket onto the engine block, ensuring it is correctly oriented according to the guide dowels. Do not use any sealant unless explicitly required by the manufacturer.
- Carefully lower the cylinder head back into place over the gasket and dowels.
- Install the head bolts and tighten them in stages using a calibrated torque wrench, following the sequence and torque specifications in the service manual.
- Reinstall all components that were previously removed.
- Refill the cooling system, check the engine oil, and reconnect the battery. Start the engine and check for any leaks.
Troubleshooting & FAQ
How do I know if this gasket fits my engine?
This gasket is specifically designed for the Yanmar 1GM10 (9HP) 4-stroke marine diesel engine. It is not compatible with the earlier Yanmar 1GM model due to differences in bore size. Please verify your engine model is 1GM10 before purchasing.
What are the signs of a failed cylinder head gasket?
Common symptoms include engine overheating, loss of compression, white smoke from the exhaust (coolant burning), milky or frothy engine oil (oil and coolant mixing), or external coolant/oil leaks from the seam between the cylinder head and engine block.
What makes this gasket different from the one for the Yanmar 1GM?
The primary difference is the bore size. The 1GM10 model has a larger cylinder bore, and this gasket is manufactured to match those specific dimensions. Using a 1GM gasket on a 1GM10 engine will result in a poor seal and immediate engine failure.
Do I need to use any sealant or adhesive with this gasket?
Generally, no. This head gasket is designed to be installed dry. Applying sealants can interfere with its ability to seal properly and may cause premature failure. Always follow the instructions in your official Yanmar service manual.
How often should a cylinder head gasket be replaced?
A cylinder head gasket is not a routine maintenance item. It is typically replaced only when it fails or during a complete engine overhaul. Its lifespan depends on operating conditions, proper installation, and engine maintenance.
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.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
