Water Pump Base Gasket – Fits Yanmar 4LH & 4LHA Series Engines (Replaces 119000-42021)
Water Pump Base Gasket – Fits Yanmar 4LH & 4LHA Series Engines (Replaces 119000-42021) 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
Water Pump Base Gasket – Fits Yanmar 4LH & 4LHA Series Engines ...
Product Details
The Water Pump Base Gasket – Fits Yanmar 4LH & 4LHA Series Engines is designed for Yanmar 4LH and 4LHA series marine diesel engines, primarily from the 1990s–2000s. This essential component installs between the water pump and the engine block, creating a secure seal to prevent coolant leaks and ensure the integrity of your cooling system.
It serves as a direct replacement for Yanmar part number 119000-42021 and aftermarket cross-reference REC119000-42021.
- Installs directly between the water pump housing and the engine block.
- Made from high-temperature resistant gasket material for durability in marine environments.
- Essential for preventing coolant loss and maintaining engine cooling performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 119000-42021 |
| Aftermarket | REC119000-42021 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is compatible with a wide range of Yanmar 4LH and 4LHA series marine diesel engines, along with several industrial models. Please verify your specific model below.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 4LH-DTE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-HTE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-STE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-TE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-DTZ | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-HT | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-HTZ | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-HTZAY | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-ST | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-STZ | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-STZAY | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-UT | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-UTZ | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-UTZAY | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-WST | 4-Stroke | 119000-42021 | |
| Yanmar | 4LH-WSTZY | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-DTE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-DTZE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-DTZP | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-HTE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-HTP | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-HTZE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-HTZP | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-STE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-STP | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-STZE | 4-Stroke | 119000-42021 | |
| Yanmar | 4LHA-STZP | 4-Stroke | 119000-42021 | |
| Yanmar | 3TNE100E | 4-Stroke | 119000-42021 | Industrial engine application |
| Yanmar | 3TN100L | 4-Stroke | 119000-42021 | Industrial engine application |
| Yanmar | 4T112TL | 4-Stroke | 119000-42021 | Industrial engine application |
Technical Specs
- Product Type
- Water Pump Base Gasket
- Installation
- Between water pump and engine block
- Material
- High-temperature resistant gasket material
- Dimensions
- 15.5 (L) x 7.0 (W) x 0.1 (H)
- Fitting Type
- Direct fit
- Operating Conditions
- Heat and pressure resistant for marine cooling systems
- Warranty
- 6 months (Genuine Yanmar)
- Function
- Seals the joint between the water pump and engine block to prevent coolant leaks.
What’s in the Box
- 1 x Water Pump Base Gasket (equivalent to 119000-42021)
Installation Notes
- Disconnect the vessel's battery and completely drain the engine cooling system.
- Carefully detach hoses and remove the bolts securing the water pump assembly to the engine block.
- Thoroughly remove the old gasket material from both the engine block and water pump mating surfaces. Ensure both surfaces are clean, dry, and free of corrosion or debris.
- Position the new gasket onto the engine block, aligning it with the bolt holes. Do not use sealant unless specified by your engine's service manual.
- Re-install the water pump assembly, tightening the mounting bolts to the manufacturer's specified torque in a crossing pattern to ensure even pressure.
- Reconnect all hoses, refill the cooling system with the appropriate coolant, and reconnect the battery. Start the engine and carefully inspect for any leaks around the gasket area.
Troubleshooting & FAQ
How do I confirm this gasket fits my engine?
This gasket is designed for Yanmar 4LH and 4LHA series engines. The best way to confirm is to check the Engine & Model Compatibility table on this page. Cross-referencing your engine model and original part number (119000-42021) is essential.
What are the signs of a failed water pump gasket?
Visible coolant leaks around the base of the water pump, a persistent smell of coolant in the engine bay, and engine overheating are all common indicators that the gasket may have failed and needs replacement.
Do I need to use an additional sealant with this gasket?
Generally, this gasket is designed to be installed dry. However, always consult your Yanmar service manual for model-specific recommendations. Some mechanics may apply a very thin, non-hardening sealant as a precautionary measure.
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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