MerCruiser Thermostat 882604

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 orderingespecially 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)

Whats 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Alternate / Superseded Part Numbers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 dieseland since its discontinued, most replacements require sourcing aftermarket or cross-referencing. Also note: this setup uses multiple gaskets, so dont reuse old seals LAST ONE