MerCruiser Thermostat – 882604
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
he Mercury MerCruiser 882604 Thermostat is a genuine OEM thermostat designed for MerCruiser CMD 1.7L diesel engines (DTI platform).
This thermostat regulates coolant flow through the engine, allowing it to reach proper operating temperature and maintain stable thermal performance under load. It is calibrated specifically for diesel applications, ensuring correct combustion efficiency and preventing both overheating and cold-running conditions.
This part is used within the thermostat housing assembly, working alongside multiple gaskets and seals to control coolant circulation through the engine and heat exchanger system.
⚠️ This part is now NLA (No Longer Available) from Mercury — replacement or cross-reference sourcing is typically required.
Key Features
- Genuine Mercury / Quicksilver OEM thermostat
- Designed for MerCruiser diesel engines
- Maintains proper operating temperature
- Prevents overheating and inefficient combustion
- Direct fit within OEM thermostat housing
Engine Compatibility
MerCruiser Diesel Engines
- CMD 1.7 MI (120 HP) inline 4
- CMD 1.7 MS (120 HP) inline 4
- 1.7L DTI diesel engines
➡️ Used in serial ranges including:
- 8810800 and newer / 88109041 and newer
➡️ Found in:
- Sterndrive diesel applications
- DTI-based cooling systems
Serial Number Fitment Notice
Fitment depends on:
- Exact engine model (MI vs MS variants)
- Serial number range
⚠️ Always confirm compatibility using your engine serial number before ordering—especially important since this part is discontinued.
Specifications
- Part Number: 882604
- Type: Engine thermostat
- Application: Diesel cooling system
- Engine Platform: MerCruiser 1.7L DTI
- Status: Discontinued (NLA)
What’s Included
- Thermostat only
(Gaskets and seals sold separately)
When This Part Needs Replacement
- Engine overheating
- Engine not reaching operating temperature
- Temperature fluctuation
- Sticking due to corrosion or debris
- Routine service on high-hour diesel engines
Installation Notes
- Replace associated gaskets during install
- Clean thermostat housing thoroughly
- Verify correct orientation
- Inspect housing and seals (multiple sealing points on this engine)
- Test operating temperature after installation
Alternate / Superseded Part Numbers
OEM Cross References
- Mercury / MerCruiser: 882604
- No direct current OEM replacement (obsolete)
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
💡 Parts Desk Insight
This thermostat is specific to the 1.7L diesel—and since it’s discontinued, most replacements require sourcing aftermarket or cross-referencing. Also note: this setup uses multiple gaskets, so don’t reuse old seals 👍LAST ONE
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.