Cylinder Head Gasket – Fits Yanmar 3JH Series Marine Engines (Replaces 129171-01330)
Cylinder Head Gasket – Fits Yanmar 3JH Series Marine Engines (Replaces 129171-01330) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Yanmar 3JH Series Marine Engines (Repla...
Product Details
This is a high-quality aftermarket Cylinder Head Gasket – Fits Yanmar 3JH Series Marine Engines (Replaces 129171-01330), designed for 3-cylinder, 4-stroke marine diesel engines from the 1990s and 2000s. It ensures a reliable seal between the cylinder head and engine block.
This part is a direct replacement for Yanmar part number 129171-01330 and equivalent aftermarket references.
- Engineered for direct-fit installation.
- Constructed from durable multi-layer steel/composite material.
- Meets standard 1.4 mm thickness specification for a precise seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 129171-01330 |
| Aftermarket | 129171-01330 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket fits a wide range of Yanmar 3JH series engines, including turbocharged and generator models.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yanmar | 3JH2 | 25-30 | 4-Stroke | 129171-01330 | |
| Yanmar | 3JH25 | 25 | 4-Stroke | 129171-01330 | |
| Yanmar | 3JH30 | 30 | 4-Stroke | 129171-01330 | |
| Yanmar | 3JH2(B)E | 25-30 | 4-Stroke | 129171-01330 | |
| Yanmar | 3JH2BE | 25-30 | 4-Stroke | 129171-01330 | |
| Yanmar | 3JH2E | 25-30 | 4-Stroke | 129171-01330 | |
| Yanmar | 3JH2T(B)E | 25-30 | 4-Stroke | 129171-01330 | Turbocharged model |
| Yanmar | 3JH2TBE | 25-30 | 4-Stroke | 129171-01330 | Turbocharged model |
| Yanmar | 3JH2TE | 25-30 | 4-Stroke | 129171-01330 | Turbocharged model |
| Yanmar | 3JH2S-TBE | 25-30 | 4-Stroke | 129171-01330 | Special turbocharged model |
| Yanmar | 3JH2G-TBE | 25-30 | 4-Stroke | 129171-01330 | Generator turbocharged model |
| Yanmar | 3JH2L-TNE | 25-30 | 4-Stroke | 129171-01330 | Long-block turbocharged model |
| Yanmar | 3JH2Z | 25-30 | 4-Stroke | 129171-01330 | Generator application |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct replacement
- Fuel Type
- Diesel
- Housing Material
- Multi-layer steel/composite
- Dimensions
- 31.0 cm L x 16.0 cm W x 0.1 cm H
- Weight
- 0.5 kg (1.1 lb)
- Thickness
- 1.4 mm
What’s in the Box
- 1 x Cylinder Head Gasket (129171-01330)
Installation Notes
- Disconnect the battery and drain the engine coolant completely.
- Remove the intake/exhaust manifolds, valve cover, and rocker arm assembly.
- Loosen and remove the cylinder head bolts in the reverse order of the manufacturer's specified torque sequence.
- Carefully lift the cylinder head off the engine block.
- Remove the old gasket and thoroughly clean both mating surfaces of any old gasket material or debris.
- Position the new gasket correctly on the engine block; check for any "TOP" or "FRONT" markings.
- Reinstall the cylinder head. Lubricate and install the head bolts, tightening them in stages according to the official torque sequence and specifications.
- Reassemble the rocker arms, manifolds, and all other components removed.
Troubleshooting & FAQ
How do I know if this gasket fits my Yanmar engine?
This gasket is specifically designed for the Yanmar 3JH series, including models like the 3JH2, 3JH25, and various turbo versions. To ensure a perfect match, please verify that your engine model is on our compatibility list and that the part number you are replacing is 129171-01330.
What are the signs of a failed cylinder head gasket?
Common symptoms of a blown head gasket include engine overheating, white smoke from the exhaust (indicating burning coolant), milky or frothy engine oil (coolant mixing with oil), loss of power, or poor engine compression.
Is this gasket thicker or thinner than the original?
This gasket has a standard thickness of 1.4 mm, which matches the OEM specification for most Yanmar 3JH applications. Always consult your engine's service manual to confirm the required gasket thickness, especially if the head or block has been machined.
Can I reuse my old cylinder head gasket?
No. Cylinder head gaskets are "crush" type gaskets designed for one-time use. They deform to create a perfect seal and must be replaced every time the cylinder head is removed to ensure engine integrity.
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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