Cylinder Head Gasket – Fits Yanmar 4LH & 4LHA Series Marine Engines (Replaces 119174-01340)
Cylinder Head Gasket – Fits Yanmar 4LH & 4LHA Series Marine Engines (Replaces 119174-01340) 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 4LH & 4LHA Series Marine Eng...
Product Details
This high-quality Cylinder Head Gasket – Fits Yanmar 4LH & 4LHA Series Marine Engines is engineered to create a perfect seal between the cylinder head and the engine block. It is specifically designed for a direct fit on various Yanmar 4LH and 4LHA series diesel engines, including popular models like the 4LH-DTE, 4LH-HTE, 4LH-STE, 4LHA-STE, and 4LHA-HTE.
This part serves as a direct replacement for Yanmar OEM part number 119174-01340 and aftermarket equivalent RM119174-01340.
- Engineered to prevent coolant and combustion gas leaks effectively.
- Made from a high-temperature resistant composite for durability in marine environments.
- Maintains proper engine compression and operating efficiency.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 119174-01340 |
| Aftermarket | RM119174-01340 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is confirmed compatible with the following Yanmar Marine Engines.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 4LH-TE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-HTE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-DTE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-STE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-HT | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-HTZ | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-HTZAY | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-DTZ | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-UT | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-UTZAY | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-UT2 | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-ST | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-STZAY | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-STZ | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-WST | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LH-WSTZY | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-STE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-STP | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-STZE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-STZP | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-DTE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-DTP | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-DTZE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-DTZP | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-HTE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-HTP | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-HTZE | 4-Stroke | 119174-01340 | Diesel marine engine |
| Yanmar | 4LHA-HTZP | 4-Stroke | 119174-01340 | Diesel marine engine |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Fitment
- Direct fit between cylinder head and engine block
- Fuel Type
- Diesel
- Material
- High-temperature resistant composite
- Thickness
- 1.3 mm
- Product Dimensions
- 53.5 cm x 21.5 cm x 2.0 cm
- Weight
- 1 kg (2.2 lb)
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 119174-01340)
Installation Notes
- Disconnect the battery and completely drain the engine's cooling system.
- Remove components obstructing access to the cylinder head, including intake/exhaust manifolds, fuel lines, and valve cover.
- Following the service manual, loosen and remove the head bolts in the specified reverse sequence to prevent head warping.
- Carefully lift the cylinder head from the engine block. Avoid using pry tools that could damage mating surfaces.
- Thoroughly clean all old gasket material, sealant, and debris from both the engine block deck and cylinder head surfaces.
- Position the new head gasket on the engine block, ensuring it aligns perfectly with the dowel pins and passages.
- Gently lower the cylinder head back onto the block, making sure it is properly seated.
- Install new or inspected head bolts, lubricating the threads as per the manual. Torque them in the correct sequence and stages.
- Reinstall all previously removed components and reconnect all lines and electrical connectors.
- Refill the cooling system with the correct type and amount of coolant, then reconnect the battery.
Troubleshooting & FAQ
How do I know if this gasket will fit my Yanmar engine?
This gasket is designed for Yanmar 4LH and 4LHA series marine diesel engines. Please review the comprehensive "Engine & Model Compatibility" table on this page and cross-reference your specific model to ensure a perfect match.
What are the common signs of a failing cylinder head gasket?
Symptoms of a bad head gasket include engine overheating, white smoke from the exhaust (burning coolant), milky or foamy engine oil, loss of power, and bubbles in the coolant overflow tank. If you notice any of these, have your engine inspected immediately.
Is this aftermarket gasket as reliable as the OEM part?
Yes. This aftermarket part is built to meet or exceed OEM specifications using comparable high-quality, temperature-resistant materials. It is manufactured in an ISO 9002 certified facility and undergoes strict quality control to ensure performance and longevity.
Do I need to apply sealant when installing this gasket?
Generally, modern composite head gaskets like this one are designed to be installed dry without any additional sealants. Always consult your specific engine's service manual for the official procedure, as sealant application can sometimes interfere with a proper seal.
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.
