Mercury - Thermostat 120 - 14586
No restocking fees on eligible returns
You have 30 days to request a return. All sale items are final sale.
Customer pays return postage. Return postage is reimbursed if we made a mistake.
The Mercury Thermostat 14586 is a 120°F thermostat for Mercury 40 HP through 60 HP 4-stroke outboards, serial number 1C050252 and above. It helps regulate engine operating temperature by controlling coolant flow through the cooling system.
Key Features
- 120°F thermostat
- Fits Mercury 40 HP through 60 HP 4-stroke outboards
- For serial number 1C050252 and above
- Helps maintain proper engine operating temperature
- OEM-style cooling-system replacement part
Engine Compatibility
Fits Mercury 40 HP, 50 HP, and 60 HP 4-stroke outboards with serial number 1C050252 and above.
Serial Number Fitment Notice
Verify your outboard serial number before ordering. This thermostat is for compatible Mercury 40–60 HP 4-stroke outboards from serial number 1C050252 and above.
When This Part Needs Replacement
Replace the thermostat if the engine runs too cool, overheats, warms up slowly, has unstable temperature readings, or if the thermostat is corroded, stuck open, or stuck closed.
Installation Notes
Install with the correct gasket or seal for the thermostat housing. Clean the housing surfaces before reassembly and inspect for corrosion, pitting, or debris in the cooling passage.
Alternate/Superseded Part Numbers
Primary Mercury reference: 14586.
Parts Desk Insight
Thermostat temperature matters. This is the 120°F version, so match both the part number and the serial-number range before replacing it.
Shipping: Available items are ready for pickup or shipping between one and three business days. ⚓
Shipping information
Free standard shipping in Canada on eligible orders over $150 CAD after discounts and before taxes, up to 15 kg. Freight, oversized, remote-area and express exclusions apply. See our shipping policy.
In-stock at Marisol: usually ready for pickup the same day. Supplier-stock items: usually ready for pickup within 24 hours. Wait for your pickup-ready confirmation.
In-stock items receive priority shipping processing. Supplier-stock items generally ship within 1–3 business days. Special-order timing varies. Carrier delivery time is additional.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.
No restocking fee applies to eligible returns. Customers arrange and pay return postage unless we made a mistake, in which case we reimburse return postage. See the return policy for eligibility and exclusions, or contact us.