Water Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel Engines (Replaces 129150-35111)
Water Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel Engines (Replaces 129150-35111) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
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 Water Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel Engines provides a secure, reliable seal between the water pump and engine block. It is designed specifically for Yanmar 3JH and 4JH series marine diesel engines to ensure optimal performance and prevent coolant leaks.
This part is a direct replacement for Yanmar OEM part number 129150-35111.
- Installation: Direct placement between the water pump and engine block.
- Material: Made from a heat-resistant, pressure-resistant composite to withstand harsh marine environments.
- Function: Creates a durable seal to prevent coolant loss and protect engine integrity.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 129150-35111 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is designed for Yanmar 3JH and 4JH series marine diesel engines. Please verify your specific model and part number before ordering.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 3JH Series | 4-Stroke | 129150-35111 | Marine diesel engines |
| Yanmar | 4JH Series | 4-Stroke | 129150-35111 | Marine diesel engines |
Technical Specs
- Product Type
- Water Pump Gasket
- Installation
- Direct placement between water pump and engine block
- Material
- Heat-resistant, pressure-resistant composite
- Application
- Marine diesel engines
- Compatibility
- Yanmar 3JH and 4JH series engines
- Dimensions
- 0.1" H x 1.5" W x 1.5" L
- Warranty
- Varies by seller (typically 6 months)
- Other Technical Attributes
- Designed to withstand marine environments
What’s in the Box
- 1 x Water Pump Gasket (129150-35111)
Installation Notes
- Disconnect the battery and ensure the engine has completely cooled.
- Drain the engine coolant into a suitable container.
- Remove any components obstructing access to the water pump, then unbolt and remove the pump assembly.
- Carefully remove the old gasket. Thoroughly clean both the engine block and water pump mating surfaces to remove any old gasket material or sealant residue.
- Position the new gasket on the engine block. It is designed to be installed dry unless your service manual specifies otherwise.
- Reinstall the water pump, tightening the bolts to the manufacturer's specified torque in a crisscross pattern to ensure even pressure.
- Refill the cooling system with the appropriate coolant, start the engine, and carefully inspect the pump for any signs of leaks.
Troubleshooting & FAQ
How do I confirm this gasket fits my engine?
This gasket is designed for Yanmar 3JH and 4JH series marine engines. The most reliable method is to cross-reference the OEM part number 129150-35111 with your engine's service manual or existing part. Refer to our compatibility table for model details.
What are the signs of a failing water pump gasket?
Common symptoms include visible coolant drips or leaks from the area around the water pump, engine overheating, and a constant need to top off coolant. A physical inspection may reveal cracks or degradation of the old gasket.
Do I need to use sealant with this gasket?
This gasket is typically designed for a dry installation. Applying sealant can sometimes interfere with a proper seal. However, always consult your engine's official service manual for procedures specific to your model.
When should this gasket be replaced?
It is best practice to replace the water pump gasket any time the water pump is removed for service or replacement. It should also be replaced immediately if you detect a coolant leak from the pump joint.
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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