Recmar MerCruiser 2.5 3.0L Thermostat Kit 140°F 59078Q3
REC59078Q3
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MerCruiser 2.5L / 3.0L Thermostat Kit
Inline Four-Cylinder | 140°F / 60°C
Aftermarket 140°F thermostat service kit for MerCruiser GM 2.5L and 3.0L inline-four sterndrive engines using the 59078Q3 reference family.
Key Features
- 140°F / 60°C thermostat
- For MerCruiser 2.5L and 3.0L inline-four engines
- Common 120hp and 140hp applications
- Cross-reference Sierra 18-3650
- Recmar aftermarket service kit
Technical Specs
| Type | Thermostat kit |
| Temperature | 140°F / 60°C |
| Engine | GM inline four-cylinder |
| Displacement / power | 2.5L 120hp; 3.0L 140hp |
| SKU | REC59078Q3 |
Compatibility / Fitment Guide
| Engine family | Verified application | Notes / exclusions |
|---|---|---|
| MerCruiser 2.5L | 120hp inline-four models using 59078Q3/T3 family | Confirm serial number and housing. |
| MerCruiser 3.0L | 140hp inline-four models using the same family | Not every later 3.0L housing uses identical seals. |
| Early inline-six | Only if the engine-specific catalogue explicitly lists 59078Q3 | Do not infer from 165hp alone. |
| Exclusion | GM V6/V8 engines and 3.7L 470 family | Different thermostat kits. |
Confirm the full model, serial number, cooling-system type and original part number.
Part Number Cross Reference
| MerCruiser | 59078Q3 |
| MerCruiser related | 59078T3; 59078T4; 59078A1; 59078B |
| Sierra | 18-3650; 18-3550 |
| GLM | 13370 |
| Mallory | 9-43153 |
| 4Boats SKU | REC59078Q3 |
Recmar aftermarket replacement; brand names and references identify compatibility only.
Frequently Asked Questions
What is the opening temperature?
140°F / 60°C.
Will it fit a 3.7L 470?
No. The 470 family uses a different thermostat application.
Is it for V6/V8 engines?
No. This listing is for the inline-four 2.5/3.0L family.
Installation note: Fit on a cool engine, renew damaged seals, clean mating surfaces and verify correct operating temperature after service.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
