Cylinder Head Gasket – Fits Yanmar 6LP/6LPA Series Marine Engines (Replaces 119770-00940)
Cylinder Head Gasket – Fits Yanmar 6LP/6LPA Series Marine Engines (Replaces 119770-00940) 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
Cylinder Head Gasket – Fits Yanmar 6LP/6LPA Series Marine Engines (...
Product Details
This is a high-quality aftermarket Cylinder Head Gasket – Fits Yanmar 6LP/6LPA Series Marine Engines. Specifically designed as the Mark 3 gasket variant, it ensures a precise fit and reliable seal for compatible Yanmar marine diesel engines, restoring performance and preventing leaks between the cylinder head and the engine block.
This part is a direct replacement for Yanmar OEM part number 119770-00940.
- Installs between the cylinder head and the engine block.
- Engineered for 6-cylinder marine diesel engine applications.
- A high-quality aftermarket alternative to the OEM genuine part.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 119770-00940 | Genuine OEM Reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 6LP-DT | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LP-DTP | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LP-DTZE | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LP-DTZE1 | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LP-DTZEP | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LP-DTZEP1 | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LP-DTZY | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LP-WDT | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LP-WDTZY | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LPA-DTE | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LPA-DTP | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LPA-DTZE | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LPA-DTZP | 4-Stroke | 119770-00940 | Mark 3 variant |
| Yanmar | 6LPA-DTZEP1 | 4-Stroke | 119770-00940 | Mark 3 variant |
Technical Specs
- Product Type
- Cylinder Head Gasket (Mark 3)
- Installation Location
- Between cylinder head and engine block
- Application
- Marine diesel engines
- Engine Type
- 6-cylinder diesel
- Product Length
- 66.5 cm
- Product Width
- 18.5 cm
- Product Height
- 0.1 cm
- Weight
- 1 kg (2.2 lb)
- Warranty
- Varies by supplier (Aftermarket: typically 1 year)
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 119770-00940)
Installation Notes
- Disconnect the vessel's battery and drain the cooling system completely.
- Remove all components obstructing access to the cylinder head, such as intake/exhaust manifolds and fuel lines. Tag connectors for easier reassembly.
- Following the manufacturer's service manual, loosen and remove the cylinder head bolts in the specified sequence to prevent head warpage.
- Carefully lift the cylinder head off the engine block. Avoid using pry tools that could damage the mating surfaces.
- Remove the old head gasket. Thoroughly clean both the engine block deck and the cylinder head surface of all old gasket material, sealant, and carbon buildup.
- Position the new Mark 3 head gasket correctly on the engine block, ensuring it aligns perfectly with the dowel pins and all fluid passages.
- Carefully lower the cylinder head back onto the block and gasket.
- Install new or verified-to-spec head bolts. Torque them in the correct pattern and stages as required by the Yanmar service manual.
- Reassemble all previously removed components.
- Refill the engine with fresh coolant, reconnect the battery, and perform a final check of all connections.
- Start the engine and let it reach operating temperature while checking for any coolant, oil, or exhaust leaks around the head.
Troubleshooting & FAQ
How do I know if this is the correct "Mark 3" gasket for my engine?
This gasket is the "Mark 3" variant required for later 6LP/6LPA series engines. It is crucial to verify your engine's requirements, as earlier models may use a different gasket. Always compare your old part to our product images and the OEM part number (119770-00940) to ensure a match.
What are common signs of a failed cylinder head gasket?
Symptoms include engine overheating, a noticeable loss of power, white smoke from the exhaust (indicating coolant is being burned), milky or discolored engine oil (from oil and coolant mixing), or external fluid leaks from the seam between the cylinder head and engine block.
Is there a recommended replacement interval for this gasket?
Cylinder head gaskets are typically only replaced when the cylinder head is removed for service or if the gasket has failed. There is no standard replacement interval, as its lifespan depends heavily on engine operating conditions and ensuring it was installed correctly with proper torque settings.
Do I need to use sealant with this gasket?
Generally, modern multi-layer steel (MLS) gaskets like this one are designed to be installed dry without any additional sealants. Applying sealants can interfere with proper sealing and torque distribution. Always follow the specific instructions in your engine's official service manual.
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
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