Cylinder Head Gasket – Fits Yanmar 6LP/6LPA Series Marine Engines (Replaces 119770-00950)
Cylinder Head Gasket – Fits Yanmar 6LP/6LPA Series Marine Engines (Replaces 119770-00950) is backordered and will ship as soon as it is back in stock.
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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, designed to create a reliable seal between the cylinder head and the engine block. It is specifically engineered for Yanmar's 315 HP 6LP and 6LPA series marine diesel engines.
It serves as a direct replacement for Yanmar OEM part number 119770-00950.
- Installation Location: Between the engine block and cylinder head.
- Mark Version: This is a Mark 5 version gasket.
- Fuel Compatibility: Designed for diesel engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 119770-00950 | Mark 5 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yanmar | 6LP-DT | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-DTE | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-DTP | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-DTZE | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-DTZE1 | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-DTZEP | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-DTZEP1 | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-DTZY | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-WDT | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LP-WDTZY | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LPA-DTE | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LPA-DTP | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LPA-DTZE | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LPA-DTZP | 315 | 4-Stroke | 119770-00950 | |
| Yanmar | 6LPA-DTZEP1 | 315 | 4-Stroke | 119770-00950 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Between cylinder head and engine block
- Fuel Type
- Diesel
- Dimensions
- 66.5 cm × 18.5 cm × 0.1 cm
- Weight
- 1 kg (2.2 lb)
- Condition
- New
- Mark Version
- Mark 5
What’s in the Box
- 1 x Cylinder Head Gasket (119770-00950)
Installation Notes
- Disconnect the vehicle's battery and drain the cooling system completely.
- Remove components obstructing access to the cylinder head, such as the intake manifold, exhaust manifold, and valve cover.
- Loosen and remove the cylinder head bolts following the manufacturer's recommended sequence, usually in reverse of the tightening order.
- Carefully lift the cylinder head from the engine block. Avoid using pry tools that could damage the mating surfaces.
- Thoroughly clean both the engine block deck and the cylinder head surface. Ensure they are free of old gasket material, oil, and contaminants.
- Place the new head gasket onto the engine block, ensuring it aligns correctly with dowel pins and passages.
- Gently lower the cylinder head back into position on the block and gasket.
- Install new or verified-to-spec head bolts. Lubricate threads as per the service manual.
- Tighten the head bolts in the specified sequence and in multiple stages to achieve the correct torque value.
- Reinstall all components that were previously removed.
- Refill the engine with the appropriate coolant.
- Reconnect the battery, start the engine, and carefully check for any coolant, oil, or exhaust leaks.
Troubleshooting & FAQ
How do I know if this head gasket fits my Yanmar engine?
This gasket is made specifically for the Yanmar 6LP and 6LPA series diesel engines. To ensure a perfect match, please compare your engine model to the detailed compatibility list on this page. This is a "Mark 5" version, which directly replaces OEM part number 119770-00950. Verifying the part number is the best way to guarantee fitment.
What are the common symptoms of a failing head gasket?
Key signs of a blown head gasket include persistent engine overheating, white smoke from the exhaust (indicating coolant is being burned), a milky or frothy appearance in the engine oil (due to coolant contamination), bubbles in the radiator or coolant overflow tank, and a noticeable loss of engine power or compression.
Is it necessary to use the "Mark 5" version?
Yes. Different "marks" or versions of a part like a head gasket often include material or design updates for improved performance and reliability. Using the specific Mark 5 version is crucial for engines that require it to ensure a proper, lasting seal and prevent leaks or engine damage.
Should I replace the cylinder head bolts at the same time?
Absolutely. Most modern marine engines, including many Yanmar models, use torque-to-yield (TTY) head bolts. These are designed to stretch permanently upon initial installation and cannot provide the correct clamping force if reused. Reusing old bolts is a leading cause of premature new head gasket failure.
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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