Recmar Mercury 15-20HP EFI Thermostat 125F 8M0139434
REC8M0139434
- Dispatched in 2-3 days
- 30 Day Return Policy
- Low stock - 3 items left
- Backordered, shipping soon
Recmar Mercury 8M0139434 Thermostat
125°F replacement thermostat for selected 15–20 HP EFI four-stroke outboards
Aftermarket RECMAR thermostat replacing Mercury/Quicksilver 8M0139434. The verified core application is the newer Mercury 15 HP and 20 HP EFI two-cylinder four-stroke family introduced for model year 2017; it is an outboard part, not a MerCruiser sterndrive thermostat.
Key Features
- RECMAR aftermarket replacement; not genuine Mercury or Quicksilver
- 125°F / approximately 52°C nominal calibration
- For selected Mercury 15 HP and 20 HP EFI two-cylinder four-strokes
- Model-year 2017 and newer core application
- Outboard cooling-system part
- One thermostat supplied
Technical Specs
| Part type | Outboard engine thermostat |
| Opening temperature | 125°F / approx. 52°C nominal |
| Engine family | Mercury 15–20 HP EFI, 2-cylinder, four-stroke |
| Supply | 1 thermostat |
| 4Boats SKU | REC8M0139434 |
Compatibility / Fitment Guide
| Engine family | Verified application | Important notes |
|---|---|---|
| Mercury 15 HP EFI FourStroke | Model year 2017-on using 8M0139434 | Check serial number and model-specific diagram |
| Mercury 20 HP EFI FourStroke | Model year 2017-on using 8M0139434 | Check serial number and model-specific diagram |
| Mercury 15 HP EFI reference range | Official listings include serial 0R833820 and above for specified applications | Market-specific serial ranges can differ |
| MerCruiser sterndrive/inboard | Not the verified application | Do not order from the old MerCruiser wording |
Before ordering: Verify 8M0139434 in the Mercury parts catalogue. Do not substitute 855676005/8M0119207 solely because some aftermarket kits group related small-outboard components.
Part Number Cross Reference
| Mercury / Quicksilver OEM | 8M0139434 |
| RECMAR / 4Boats | REC8M0139434 |
| Alternate search format | 8M0139434 thermostat |
Frequently Asked Questions
Is this for MerCruiser engines?
No. The verified application is selected Mercury 15–20 HP EFI four-stroke outboards.
Which years fit?
The core official application is model year 2017 and newer, subject to serial-number confirmation.
Is it genuine Mercury?
No. It is a RECMAR aftermarket replacement.
Does horsepower alone confirm fitment?
No. Confirm EFI two-cylinder architecture, year/serial range and OEM number.
Installation note: Allow the engine to cool, renew any disturbed seal or gasket where required, and follow the engine manufacturer's service procedure. After installation, run the engine and check for leaks and correct cooling-water flow.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
