Cylinder Head Gasket – Fits Yanmar 3JH4E & 3JH5AE Marine Engines (Replaces 129001-01340)
Cylinder Head Gasket – Fits Yanmar 3JH4E & 3JH5AE Marine Engines (Replaces 129001-01340) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Yanmar 3JH4E & 3JH5AE Marine Engine...
Product Details
This OEM-grade Cylinder Head Gasket – Fits Yanmar 3JH4E & 3JH5AE Marine Engines (Replaces 129001-01340) provides a reliable seal between the cylinder head and engine block. It is specifically designed for Yanmar 3JH4E and 3JH5AE marine diesel engines, preventing leakage of combustion gases, coolant, and oil.
This part is a direct replacement for Yanmar OEM part number 129001-01340.
- Installation: Direct replacement for a secure fit.
- Material: Made from a high-temperature resistant composite for durability.
- Function: Ensures a proper seal to maintain engine performance and prevent fluid cross-contamination.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 129001-01340 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is a confirmed fit for the following Yanmar marine engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yanmar | 3JH4E | 39 | 4-Stroke | 2007–Present | 129001-01340 | Marine Diesel |
| Yanmar | 3JH5AE | 39 | 4-Stroke | 2012–Present | 129001-01340 | Marine Diesel |
| Yanmar | 3JH5E | 39 | 4-Stroke | 2012–Present | 129001-01340 | Marine Diesel |
| Yanmar | 3JH4 | 39 | 4-Stroke | 2007–Present | 129001-01340 | Marine Diesel |
| Yanmar | 3JH5 | 39 | 4-Stroke | 2012–Present | 129001-01340 | Marine Diesel |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct Replacement
- Fuel Type
- Diesel
- Dimensions
- 375 × 185 × 3 mm (14.76 × 7.28 × 0.12 in)
- Weight
- 0.12 kg (0.26 lb)
- Material
- High-temperature Resistant Composite
- Application
- Marine Diesel Engines
- OEM Part Number
- 129001-01340
What’s in the Box
- 1 x Cylinder Head Gasket (129001-01340)
Installation Notes
- Disconnect the vessel's battery and drain the engine cooling system completely.
- Remove all components obstructing access to the cylinder head, such as the intake, exhaust manifold, and valve cover.
- Following the manufacturer's service manual, loosen the cylinder head bolts in the specified sequence (typically in several passes from the outside bolts inward).
- Carefully lift the cylinder head from the engine block. Avoid using pry tools that could damage the mating surfaces.
- Thoroughly clean the mating surfaces on both the engine block and the cylinder head. Ensure they are free of any old gasket material, carbon, or debris.
- Position the new head gasket correctly on the engine block, verifying its orientation with the dowel pins.
- Lower the cylinder head back into place over the gasket and dowel pins.
- Install and tighten the cylinder head bolts in the correct sequence and to the precise torque specifications provided in your engine's service manual. This is a critical step.
- Reassemble all previously removed components.
- Refill the cooling system with the appropriate coolant, reconnect the battery, and check for leaks after starting the engine.
Troubleshooting & FAQ
How do I know if my head gasket is failing?
Common signs of a blown head gasket include significant white smoke from the exhaust, a milky or frothy appearance in the engine oil, engine overheating, coolant loss without visible external leaks, and reduced engine power or misfires.
Is this gasket compatible with industrial Yanmar engines?
While the OEM part number 129001-01340 is cross-referenced with some industrial models (like the 3TNE88 and 3TNV88), this part is specified and tested for the Yanmar 3JH series marine engines. Please verify all specifications before using it in an industrial application, as operating conditions may differ.
Does this gasket require any sealant during installation?
No. This is a composite gasket designed for dry installation. Applying sealants can interfere with its ability to seal correctly and may lead to premature failure. Always follow the installation instructions in your engine’s official service manual.
What is the recommended replacement interval for a head gasket?
Head gaskets do not have a standard replacement interval. They are typically replaced only when they fail or during a complete engine overhaul. Their lifespan depends on engine condition, operating hours, and 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.
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