Thermostat Cover Gasket – Fits Yanmar 2GMLP Marine Engines (Replaces 129350-49541)
Thermostat Cover Gasket – Fits Yanmar 2GMLP Marine Engines (Replaces 129350-49541) 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
Thermostat Cover Gasket – Fits Yanmar 2GMLP Marine Engines (Replace...
Product Details
This aftermarket Thermostat Cover Gasket – Fits Yanmar 2GMLP Marine Engines (Replaces 129350-49541) is designed for a precise fit on various Yanmar marine diesel engines, including the 2GM, 3GM, and 3HM series. It creates a reliable seal between the thermostat housing and the engine block, essential for preventing coolant leaks and maintaining correct engine temperature.
It serves as a direct replacement for Yanmar part numbers 129350-49541, 129350-49540, and 124736-49540.
- Ensures a direct-fit installation in the marine cooling system.
- Made from heat and pressure-resistant material for marine environments.
- Prevents coolant leaks to ensure proper temperature regulation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 129350-49541 |
| Yanmar | 129350-49540 |
| Yanmar | 124736-49540 |
| RECMAR | REC129350-49541 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is confirmed compatible with the following Yanmar marine and industrial engine models.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 2GMLP | 129350-49541 | Primary application | |
| Yanmar | 2GM20F | 4-Stroke | 129350-49541 | - |
| Yanmar | 2GM(F) | 4-Stroke | 129350-49541 | - |
| Yanmar | 2GM20F-YEU | 4-Stroke | 129350-49541 | - |
| Yanmar | 2GM20FC-YEU | 4-Stroke | 129350-49541 | - |
| Yanmar | 3GM(F) | 4-Stroke | 129350-49541 | - |
| Yanmar | 3HMF | 4-Stroke | 129350-49541 | - |
| Yanmar | 3HM35F | 4-Stroke | 129350-49541 | - |
| Yanmar | 3GM30F | 4-Stroke | 129350-49541 | - |
| Yanmar | 3GM30F-YEU | 4-Stroke | 129350-49541 | - |
| Yanmar | 3GM30FC-YEU | 4-Stroke | 129350-49541 | - |
| Yanmar | 3T72HL | 4-Stroke | 129350-49541 | Industrial application |
| Yanmar | 3TNE68 | 4-Stroke | 129350-49541 | Industrial application |
| Yanmar | 3TNE74 | 4-Stroke | 129350-49541 | Industrial application |
Technical Specs
- Product Type
- Thermostat Cover Gasket
- Installation
- Direct fit between thermostat housing and engine block
- Material
- Heat-resistant gasket material
- Application
- Marine cooling system
- Purpose
- Prevents coolant leaks, ensures proper temperature regulation
- Compatibility
- Yanmar 2GMLP engines and related models
- Warranty
- 6 months (OEM/Genuine Yanmar)
- Other Technical Attributes
- Heat and pressure resistant, designed for marine environments
- Product Dimensions
- 8.0" L x 6.0" W x 0.1" H
What’s in the Box
- 1 x Thermostat Cover Gasket (Replaces 129350-49541, 129350-49540, 124736-49540)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery.
- Drain the coolant from the cooling system into a suitable container.
- Locate and remove the thermostat housing cover, noting the position of bolts and hoses.
- Carefully remove the old thermostat cover gasket, ensuring the mating surfaces on both the engine block and the housing cover are perfectly clean and free of old gasket material or debris.
- Position the new gasket correctly on the engine block.
- Reinstall the thermostat housing cover and tighten the bolts to the manufacturer's specified torque in a crossing pattern.
- Reconnect hoses, refill the cooling system with the appropriate coolant, and check for leaks.
- Reconnect the battery and run the engine until it reaches operating temperature, monitoring for any leaks.
Troubleshooting & FAQ
How do I know if this gasket fits my specific Yanmar engine?
This gasket is compatible with the models listed in the "Engine & Model Compatibility" table, including the 2GMLP, 2GM, 3GM, and 3HM series. Always verify your model number and the OEM part number (129350-49541, 129350-49540, or 124736-49540) against your engine's service manual before ordering.
What are the signs of a failing thermostat cover gasket?
Common signs include visible coolant leaks around the thermostat housing, engine overheating or fluctuating temperatures, and a low coolant level warning. You may also notice a sweet smell from burning coolant or see white residue near the gasket area.
Can I reuse my old gasket?
No. Gaskets are designed for single use and compress to create a seal. Once removed, a gasket loses its sealing ability and must be replaced to prevent leaks and ensure proper engine function.
Is any sealant required during installation?
Generally, this type of gasket is designed to be installed dry without any additional sealant. Applying sealant can sometimes interfere with the seal. Always refer to your engine's specific service manual for the recommended procedure.
What is the recommended replacement interval?
There is no fixed replacement interval for this gasket. It should be replaced whenever the thermostat is replaced, the cooling system is serviced, or if it shows any signs of leaking or degradation.
What is the difference between this part and a genuine Yanmar part?
This is an aftermarket component designed to meet or exceed OEM specifications for fit, form, and function. It is made from comparable heat-resistant materials suitable for the marine environment, offering a reliable alternative to the OEM 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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