Cylinder Head Gasket – Fits Yanmar 6LPA-STP2 & 6LP Marine Diesel Engines (Replaces 119771-00411)
Cylinder Head Gasket – Fits Yanmar 6LPA-STP2 & 6LP Marine Diesel Engines (Replaces 119771-00411) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Cylinder Head Gasket – Fits Yanmar 6LPA-STP2 & 6LP Marine Diesel Engines (Replaces 119771-00411) is backordered and will ship as soon as it is back in stock.
Product Details
This genuine aftermarket Cylinder Head Gasket – Fits Yanmar 6LPA-STP2 & 6LP Marine Diesel Engines (Replaces 119771-00411) is engineered for Yanmar 6LPA and 6LP series marine diesel engines. It is a direct fit for models including the 6LPA-STP2, 6LPA-STZP2, 6LPA-STZP3, 6LP-STE, and 6LP-STZE.
It directly replaces Yanmar OEM part number 119771-00411 and YM-11977100411, ensuring a precise fit and reliable performance.
- Designed as a critical engine service component for diesel fuel systems.
- This is a genuine OEM-equivalent part (Mark 3).
- Comes with a 6-month manufacturer warranty.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 119771-00411 |
| Yanmar | YM-11977100411 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is documented to fit the following Yanmar engine models.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 6LPA-STP2 | 4-Stroke | 119771-00411 | |
| Yanmar | 6LPA-STZP2 | 4-Stroke | 119771-00411 | |
| Yanmar | 6LPA-STZP3 | 4-Stroke | 119771-00411 | |
| Yanmar | 6LP-STE | 4-Stroke | 119771-00411 | |
| Yanmar | 6LP-STZE | 4-Stroke | 119771-00411 | |
| Yanmar | 6LP-ST | 4-Stroke | 119771-00411 | Listed in Marine Spare Parts source |
| Yanmar | 6LP-STZE1 | 4-Stroke | 119771-00411 | Listed in Marine Spare Parts source |
| Yanmar | 6LP-STZY | 4-Stroke | 119771-00411 | Listed in Marine Spare Parts source |
| Yanmar | 6LP-STZYJ | 4-Stroke | 119771-00411 | Listed in Marine Spare Parts source |
| Yanmar | 6LP-WST | 4-Stroke | 119771-00411 | Listed in Marine Spare Parts source |
| Yanmar | 6LP-WSTZY | 4-Stroke | 119771-00411 | Listed in Marine Spare Parts source |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Engine Service Component
- Fuel Type
- Diesel
- Dimensions
- 0.1" H x 18.0" W x 66.0" L
- Warranty
- 6 months (manufacturer)
- Mark/Version
- Mark 3
- Other Technical Attributes
- Genuine OEM Part
What’s in the Box
- 1 x Cylinder Head Gasket (119771-00411)
Installation Notes
- Disconnect the battery and drain the engine coolant completely.
- Carefully remove the cylinder head and associated components, labeling all connections.
- Thoroughly clean both the engine block and cylinder head mating surfaces to remove all old gasket material and debris.
- Place the new head gasket correctly, ensuring it aligns with all bolt holes and passages. Do not use sealant unless specified by the manufacturer.
- Reinstall the cylinder head and tighten the bolts in the sequence and to the torque values specified in your engine's service manual.
- Reconnect all components, refill the coolant, and change the engine oil and filter.
- Start the engine and check for any leaks before returning to service.
Troubleshooting & FAQ
How do I know if my cylinder head gasket is failing?
Common signs include engine overheating, white smoke from the exhaust (burning coolant), loss of coolant with no visible external leak, or a milky, emulsified appearance in the engine oil.
Is this gasket compatible with all Yanmar 6LP models?
It is designed for a wide range of 6LP and 6LPA series engines as listed in the compatibility table. However, always verify that your engine's required part number is 119771-00411 before ordering.
Can I reuse a cylinder head gasket?
No. Cylinder head gaskets are designed for one-time use only. They crush to create a seal and will not seal properly if reinstalled.
What does "Mark 3" mean for this gasket?
"Mark 3" indicates the specific revision or version of the part. This is important for ensuring compatibility, as different marks can have slight variations in design or materials for specific engine production runs.
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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