Oil Pan Gasket – Fits Yanmar 4JH Series Marine Diesel Engines (Replaces 129400-01751, 129400-01750)
Oil Pan Gasket – Fits Yanmar 4JH Series Marine Diesel Engines (Replaces 129400-01751, 129400-01750) 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
Oil Pan Gasket – Fits Yanmar 4JH Series Marine Diesel Engines (Repl...
Product Details
This aftermarket Oil Pan Gasket is engineered to fit a wide range of Yanmar 4JH series marine diesel engines, including models such as 4JH, 4JH-T, 4JHE, 4JH2-TE, and 4JH3-DTE. It ensures a reliable, leak-free seal between the oil pan and the engine block.
It serves as a direct interchange for Yanmar part number 129400-01751 and its superseded versions, 129400-01750 and 129470-01750.
- Designed for a direct OEM replacement fit.
- Suitable for diesel fuel marine environments.
- Engineered to prevent oil leaks and ensure proper engine lubrication.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket parts.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yanmar | 129400-01750 | 129400-01751 |
| Yanmar | 129470-01750 | 129400-01751 |
Engine & Model Compatibility
Confirm your engine model in the table below to ensure accurate fitment.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 4JH | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH-T | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH-HT | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH-DTE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JHE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH-TE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH2E | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH2-TE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH2-HTE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH2-DTE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH2-UTE (B) | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH3-DTE (YEU) | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH3-TE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH3-TCE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH3-HTE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH3-DTE | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH-TZ | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
| Yanmar | 4JH-TZA | 4-Stroke | 129400-01751 | Supersedes 129400-01750 |
Technical Specs
- Product Type
- Oil Pan Gasket
- Installation
- Direct OEM replacement
- Fuel Type
- Diesel
- Housing Material
- Gasket material
- Dimensions
- 50.0 cm x 23.0 cm x 0.5 cm
- Weight
- 1.21 kg (2.67 lb)
What’s in the Box
- 1 x Oil Pan Gasket (Replaces 129400-01751, 129400-01750)
Installation Notes
- Ensure the engine is cool and disconnect the negative battery terminal for safety.
- Position a suitable drain pan under the oil pan and drain the engine oil completely.
- Systematically remove the mounting bolts that secure the oil pan to the engine block.
- Carefully lower the oil pan. You may need to gently tap it with a rubber mallet to break the seal.
- Remove the old gasket and thoroughly clean any residual material from both the pan and the engine block mating surfaces. A plastic scraper and a suitable solvent can be used.
- Place the new gasket onto the oil pan, ensuring it is correctly aligned with the bolt holes.
- Reinstall the oil pan, hand-tightening the bolts first. Then, torque the bolts to the manufacturer's specified value and sequence using a torque wrench.
- Refill the engine with the correct grade and quantity of new oil.
- Reconnect the battery, start the engine, and carefully inspect for any oil leaks around the pan.
Troubleshooting & FAQ
How do I know if my oil pan gasket needs replacing?
The most common sign of a failing oil pan gasket is an active oil leak from the seal between the engine block and the oil pan. You may notice oil spots on the ground beneath your engine or see oil residue caked around the pan itself. A low oil level warning can also indicate a leak.
Is any sealant required with this gasket?
Consult your Yanmar engine's official service manual. While this gasket is designed to seal on its own, some procedures call for a small amount of RTV sealant at specific points, such as where engine block joints meet the pan, to ensure a complete seal.
What are the signs of an incorrectly installed gasket?
An immediate and persistent oil leak after installation is the primary sign. This can be caused by an unevenly torqued pan, damaged pan flange, or dirt left on the mating surfaces. Always ensure surfaces are perfectly clean and bolts are torqued to specification.
Can I reuse my old oil pan bolts?
It is generally recommended to inspect the old bolts for corrosion, thread damage, or stretching. If your engine's service manual requires new bolts or if the old ones show any signs of wear, they should be replaced to ensure proper clamping force and prevent future leaks.
What is the difference between this and an OEM gasket?
This aftermarket gasket is manufactured to meet or exceed OEM specifications for fit, material composition, and durability. It offers a cost-effective solution for achieving a reliable, long-lasting seal without the OEM price.
Will this gasket fit other Yanmar engine series?
No, this gasket is specifically designed for the Yanmar 4JH series engines listed in the compatibility table. Using it on other series may result in an improper fit and oil leaks. Always verify your engine model and OEM part number.
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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