Water Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel Engines (Replaces 129150-01881, 129150-01880)
Water Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel Engines (Replaces 129150-01881, 129150-01880) 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
Water Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel ...
Product Details
This high-quality Water Pump Gasket ensures a tight, reliable seal between the water pump and engine block on Yanmar 3JH and 4JH series marine diesel engines. It is designed to prevent coolant leaks and maintain the integrity of your engine’s cooling circuit, providing a durable solution for demanding marine environments.
It serves as a direct replacement for Yanmar part numbers 129150-01881 and the superseded 129150-01880.
- Engineered for marine cooling systems to resist corrosion and high pressure.
- Installs between the water pump and the engine block.
- Prevents water leaks in the cooling circuit to protect engine performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 129150-01881 | |
| Yanmar | 129150-01880 | Superseded by 129150-01881 |
Engine & Model Compatibility
Confirm your engine model in the table below.
This gasket is designed for a wide range of Yanmar marine diesel engines within the 3JH and 4JH series.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yanmar | 3JH2 | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH2-TCE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH2BE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH2E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH25A | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH3 | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH3E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH3E-YEU-E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH4E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH5AE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 3JH5E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH-DTE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH-HTE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH-HTZ | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH-HTZA | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH-TE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH-TZ | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH110 | 110 | 4-Stroke | 129150-01881 | Supersedes 129150-01880 |
| Yanmar | 4JH2-DTE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH2-HTE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH2-TE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH2E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH3-DTE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH3-HTE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH3-TE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH3E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH4-HTE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH4-TE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH45 | 45 | 4-Stroke | 129150-01881 | Supersedes 129150-01880 |
| Yanmar | 4JH4AE | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH4E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH57 | 57 | 4-Stroke | 129150-01881 | Supersedes 129150-01880 |
| Yanmar | 4JH5E | 4-Stroke | 129150-01881 | Supersedes 129150-01880 | |
| Yanmar | 4JH80 | 80 | 4-Stroke | 129150-01881 | Supersedes 129150-01880 |
Technical Specs
- Product Type
- Water Pump Gasket
- Application
- Marine cooling systems
- Installation
- Between water pump and engine block
- Material
- High-quality material resistant to corrosion and high pressures
- Purpose
- Maintains a tight seal between the water pump and the engine
- Function
- Prevents water leaks in cooling circuit
- Dimensions
- 9.0" L x 9.0" W x 0.1" H
What’s in the Box
- 1 x Water Pump Gasket (129150-01881/129150-01880)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Drain the engine coolant into an appropriate container.
- Remove any components obstructing access to the water pump.
- Unbolt and remove the old water pump assembly from the engine block.
- Carefully remove the old gasket and thoroughly clean both mating surfaces. Ensure they are free of old gasket material, sealant, and debris.
- Position the new gasket correctly on the engine block.
- Reinstall the water pump, tightening the bolts to the manufacturer's specified torque in a star pattern.
- Reconnect all hoses and components removed earlier.
- Refill the cooling system with the correct type and amount of coolant.
- Reconnect the battery, start the engine, and carefully check for any signs of leaks around the pump.
Troubleshooting & FAQ
How do I know if my water pump gasket is failing?
Common signs of a failing gasket include visible coolant leaks around the water pump housing, engine overheating, and a low coolant level warning without an obvious external leak. You may also notice a sweet smell from burning coolant.
Will this gasket fit models not listed in the compatibility table?
This gasket is specifically designed for the Yanmar 3JH and 4JH series engines listed. Using it on other models is not recommended, as an improper fit can lead to leaks and engine damage. Always verify your engine model before purchasing.
What is the recommended replacement interval for this gasket?
It is best practice to replace the water pump gasket whenever the water pump itself is serviced or replaced. There is no fixed time-based interval, but it should be inspected during regular engine maintenance.
Can I reuse my old gasket?
No. Gaskets are single-use components that compress and conform to the mating surfaces. Reusing an old gasket will likely result in an improper seal and lead to coolant leaks.
Do I need to use sealant with this gasket?
Most modern gaskets are designed to be installed dry. Unless specifically instructed by your engine's service manual, do not use additional sealants, as they can interfere with the gasket's ability to seal correctly.
Is there a difference in quality between this and the OEM part?
This is an aftermarket part manufactured to meet or exceed OEM specifications. It is made from high-quality, corrosion-resistant materials suitable for the marine environment, offering a reliable and cost-effective alternative to the original part.
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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