Recmar Thermostat 850055001 Mercury Mariner 40-60HP 2-Stroke 3-Cyl
REC850055001
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Recmar Mercury 850055001 Thermostat
43.3°C / 110°F thermostat for specified Mercury and Mariner 40–60 HP 3-cylinder outboards
RECMAR aftermarket replacement thermostat for Mercury/Quicksilver part numbers 850055 and 850055001. Designed for the specific Mercury and Mariner outboard applications and serial-number ranges shown below.
Key Features
- RECMAR aftermarket replacement; not a genuine Mercury/Quicksilver part
- Opening temperature: 43.3°C / 110°F
- For specified Mercury and Mariner 40–60 HP outboards
- Direct replacement for Mercury 850055 and 850055001
- One thermostat supplied
- Gasket is not included; inspect and replace the gasket or seal where required
Confirmed Compatibility
| Mercury / Mariner engine | Serial-number range |
|---|---|
| 40 HP, 3-cylinder | 0T980000–1B209735 0P325500 and later |
| 40 HP Jet | 0T980000 and later 0P325500 and later |
| 50 HP, 3-cylinder | 0T980000–0T999999 1B000001 and later 0P325500 and later |
| 55 HP, 3-cylinder | 0T980000 and later 0P325500 and later |
| 60 HP, 3-cylinder | 0T980000 and later 0P325500 and later |
Unsure whether it fits? Send us your engine serial number before ordering and we will help confirm the correct thermostat.
Technical Information
| Brand | RECMAR |
| Part type | Outboard cooling-system thermostat |
| Opening temperature | 43.3°C / 110°F |
| Mercury / Quicksilver references | 850055; 850055001 |
| Sierra reference | 18-3534 |
| GLM reference | 13140 |
| Mallory reference | 9-43029 |
| Quantity | 1 thermostat |
Frequently Asked Questions
How can I confirm compatibility?
Check your engine parts diagram for 850055 or 850055001, or match the engine horsepower and serial number against the table above.
Does it fit every Mercury 40–60 HP engine?
No. Fitment depends on the engine family and serial number, not horsepower alone.
Is it suitable for a Mercury FourStroke or MerCruiser?
Not unless the official parts diagram for that exact engine specifies 850055 or 850055001.
Is it a genuine Mercury thermostat?
No. It is a RECMAR aftermarket replacement.
Is the gasket included?
No. Inspect the existing gasket or seal and order a replacement separately if required.
Installation note: Work only on a cool engine. Clean the thermostat housing and seating face, renew disturbed seals where required, follow the manufacturer's tightening procedure, then 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.
