Mercury MerCruiser Thermostat Kit 807252T5
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Mercury 807252T5 is a genuine OEM 160°F thermostat kit for selected MerCruiser sterndrive and inboard engines. Mercury’s official listing identifies it for GM V6 and V8 MerCruiser engines with standard cooling systems from 1987–2016.
Key Features
- Genuine Mercury Marine / Quicksilver OEM thermostat kit
- Part number 807252T5
- 160°F thermostat
- Built for GM V6 and V8 MerCruiser sterndrive and inboard engines with standard cooling systems
- Mercury says the kit contains a thermostat, O-rings, and multiple gaskets
- Designed for replacement with common tools
Engine Compatibility
Mercury lists 807252T5 for all GM V8 and V6 sterndrive and inboard engines built with standard cooling systems from 1987 to 2016. Dealer listings also tie it to MerCruiser applications in that family, including common GM-based V6 and V8 packages, but exact fitment should still be confirmed by engine model and serial number before ordering.
Serial Number Fitment Notice
Please confirm compatibility in the Mercury Parts Catalog or by exact engine serial number before purchase. Thermostat kits can vary by cooling system type, so matching the exact OEM part number is the safest way to avoid a standard-cooling vs. closed-cooling mismatch. This caution is based on Mercury specifically defining 807252T5 as a standard cooling system kit.
When This Part Needs Replacement
Replace this thermostat kit when the engine is running too cool, too hot, warming up slowly, showing unstable operating temperature, or when the thermostat housing is opened during cooling-system service and the sealing components are being renewed. That service context is an inference from the part being sold as a complete thermostat kit with seals and gaskets.
Installation Notes
This kit is intended as a service-ready replacement and includes the sealing components needed for installation. Use it only on the exact MerCruiser application that calls for 807252T5, and confirm the engine uses the 160°F standard-cooling setup before ordering.
Alternate / Superseded Part Numbers
- 807252T5
- Common cross-reference listings also associate this kit with 807252Q5 and 807252T8 in the same 160°F MerCruiser thermostat family, but the safest match for this listing is the exact OEM number 807252T5.
Parts Desk Insight
Thermostat kits are one of those parts where getting the right temperature rating and cooling-system type matters more than the housing looks. On GM-based MerCruiser engines, the correct 160°F standard-cooling kit helps the engine reach and hold the operating temperature Mercury intended.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
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.