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Thermostat – Fits Mercury Mercruiser 2.0L Diesel Engines 115-170 HP (Replaces 879150054)
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Thermostat – Fits Mercury Mercruiser 2.0L Diesel Engines 115-170 HP (Replaces 879150054)
This thermostat assembly is engineered for Mercury/Mercruiser 2.0L I4 diesel engines (115-170 HP) in both EI and ES configurations. It is also fully compatible with Cummins/Mercruiser QSD 2.0L diesel engines (115-170 HP).
This component is a direct replacement for Mercury/Mercruiser part number 879150054.
- Installation Method: Direct OEM replacement
- Compatible Fuel Type: Diesel
- Included Components: Thermostat assembly
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury/Mercruiser | 879150054 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
Confirm your engine model/year in the table below.
Mercury/Mercruiser
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury Mercruiser | 2.0L EI 115 | 115 | 4-Stroke | 879150054 | Diesel |
| Mercury Mercruiser | 2.0L EI 130 | 130 | 4-Stroke | 879150054 | Diesel |
| Mercury Mercruiser | 2.0L EI 150 | 150 | 4-Stroke | 879150054 | Diesel |
| Mercury Mercruiser | 2.0L EI 170 | 170 | 4-Stroke | 879150054 | Diesel |
| Mercury Mercruiser | 2.0L ES 130 | 130 | 4-Stroke | 879150054 | Diesel |
| Mercury Mercruiser | 2.0L ES 150 | 150 | 4-Stroke | 879150054 | Diesel |
| Mercury Mercruiser | 2.0L ES 170 | 170 | 4-Stroke | 879150054 | Diesel |
Cummins/Mercruiser
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Cummins Mercruiser | CMD QSD 2.0 EI 115 | 115 | 4-Stroke | 879150054 | Diesel |
| Cummins Mercruiser | CMD QSD 2.0 EI 130 | 130 | 4-Stroke | 879150054 | Diesel |
| Cummins Mercruiser | CMD QSD 2.0 EI 150 | 150 | 4-Stroke | 879150054 | Diesel |
| Cummins Mercruiser | CMD QSD 2.0 ES 130 | 130 | 4-Stroke | 879150054 | Diesel |
| Cummins Mercruiser | CMD QSD 2.0 ES 150 | 150 | 4-Stroke | 879150054 | Diesel |
| Cummins Mercruiser | CMD QSD 2.0 ES 170 | 170 | 4-Stroke | 879150054 | Diesel |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Thermostat Assembly |
| Installation | Direct OEM replacement |
| Fuel Type | Diesel |
| Housing Material | Metal |
| Weight | 0.20 lb (0.09 kg) |
| Other Technical Attributes | For 2.0L inline-4 diesel engines |
Package Contents
1 x Thermostat (879150054)
Installation Guide
- Ensure the engine is completely cool before starting.
- Drain the engine coolant to a level below the thermostat housing.
- Locate and remove the bolts securing the thermostat housing cover.
- Carefully extract the old thermostat, noting its orientation.
- Thoroughly clean the mating surfaces of the housing and cover.
- Install the new thermostat, making sure it is oriented correctly.
- Position the new gasket and reinstall the housing cover, tightening bolts to spec.
- Refill the cooling system with the correct type and amount of coolant.
- Start the engine and carefully inspect for any leaks around the housing.
- Allow the engine to reach operating temperature to ensure the thermostat functions, and top off coolant if necessary.
Troubleshooting & FAQ
Q: How can I be sure this thermostat fits my 2.0L diesel engine?
A: This thermostat is designed for Mercury/Mercruiser and Cummins/Mercruiser 2.0L I4 diesel engines from 115-170 HP. Please check the 'Compatible Engine Models' table and cross-reference your OEM part number (879150054) to ensure a perfect match.
Q: What are common signs that my thermostat is failing?
A: Common symptoms include engine overheating, the temperature gauge reading unusually low, coolant leaks around the thermostat housing, or poor engine performance.
Q: Is this a direct replacement part?
A: Yes, this is a direct OEM-quality replacement for Mercury/Mercruiser part number 879150054. It is designed to fit and function just like the original.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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