Thermostat Housing Assembly – Fits Mercury/Mariner 75-150 HP 4-Stroke EFI Outboards (Replaces 892864T06, 8M0090819, 892864A06)
Thermostat Housing Assembly – Fits Mercury/Mariner 75-150 HP 4-Stroke EFI Outboards (Replaces 892864T06, 8M0090819, 892864A06) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Thermostat Housing Assembly – Fits Mercury/Mariner 75-150 HP 4-Stro...
Thermostat Housing Assembly – Fits Mercury/Mariner 75-150 HP 4-Stroke EFI Outboards (Replaces 892864T06, 8M0090819, 892864A06) is backordered and will ship as soon as it is back in stock.
Product Details
This complete Thermostat Housing Assembly – Fits Mercury/Mariner 75-150 HP 4-Stroke EFI Outboards (Replaces 892864T06, 8M0090819, 892864A06) is a direct-fit replacement for specified Mercury/Mariner 75-150 HP 4-Stroke EFI outboards (2001–2014). It ensures your engine maintains the correct operating temperature for optimal performance and fuel efficiency.
This part serves as a direct interchange for Mercury part numbers 892864T06 (superseded by 8M0090819) and 892864A06, as well as aftermarket equivalents from Sierra and GLM.
- Installation: Direct bolt-on design matches OEM specifications for a hassle-free fit.
- Durability: Constructed from a robust, marine-grade metal alloy to resist corrosion in freshwater and saltwater environments.
- Complete Kit: Includes the housing, pre-installed 120°F thermostat, O-ring seal, and clamp for a comprehensive repair.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury | 892864T06 | 8M0090819 |
| Mercury | 8M0090819 | |
| Mercury | 892864A06 | |
| Sierra | 18-3633 | |
| Sierra | 18-3635 | |
| Sierra | 18-3635-K | |
| GLM | 13612 |
Engine & Model Compatibility
Confirm your engine model and year in the table below. Verifying your engine's serial number against the listed range is critical for ensuring correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | EFI | 75 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
| Mercury | EFI | 80 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 0P459572-2B094995, 1B366823-2B094995 |
| Mercury | EFI | 90 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
| Mercury | EFI | 100 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 0P459572-2B094995, 1B366823-2B094995 |
| Mercury | EFI | 115 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
| Mercury | EFI Sea Pro | 75 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
| Mercury | EFI Sea Pro | 90 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
| Mercury | EFI Sea Pro | 115 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
| Mercury | EFI | 150 | 4-Stroke | 2001–2014 | 892864T06 | Serial range: 1B905505 & Up |
| Mariner | EFI | 75 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
| Mariner | EFI | 80 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 0P459572-2B094995, 1B366823-2B094995 |
| Mariner | EFI | 90 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
| Mariner | EFI | 100 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 0P459572-2B094995, 1B366823-2B094995 |
| Mariner | EFI | 115 | 4-Stroke | 2001–2009 | 892864T06 | Serial range: 1B366823-2B094995 |
Technical Specs
- Product Type
- Thermostat Housing Assembly with Thermostat
- Installation
- Direct-fit OEM replacement
- Fuel Type
- Gasoline
- Connection
- Bolt-on
- Housing Material
- Marine-grade metal alloy
- Housing Color
- Black
- Dimensions
- Approximately 100 mm × 90 mm × 150 mm
- Fitting Type
- Direct bolt-on
- Operating Temperature
- 48.8°C/50°C (120°F) rated thermostat
- Warranty
- Varies by manufacturer (typically 1 year)
- Other Technical Attributes
- Complete assembly includes housing, thermostat, O-ring and clamp
What’s in the Box
- 1 x Thermostat Housing Assembly (Replaces 892864T06/8M0090819/892864A06)
- 1 x Thermostat (pre-installed in housing)
- 1 x O-ring seal (Replaces 8M005958)
- 1 x Clamp (Replaces 888988008)
Installation Notes
- Disconnect the negative battery terminal to prevent electrical shorts.
- Allow the engine to cool completely. Drain the engine block's cooling system according to the manufacturer's service manual.
- Carefully disconnect the hoses attached to the thermostat housing, noting their orientation.
- Unbolt and remove the old housing assembly from the engine block.
- Thoroughly clean the mounting surface on the engine, ensuring it is free of old gasket material or corrosion.
- Position the new O-ring seal correctly on the new thermostat housing assembly.
- Secure the new housing to the engine, tightening bolts to the manufacturer's specified torque in a cross-pattern.
- Reconnect all hoses and secure them firmly with the appropriate clamps.
- Refill the cooling system with the recommended coolant mixture.
- Reconnect the battery, start the engine, and carefully check for any coolant leaks around the new housing and hose connections.
Troubleshooting & FAQ
How do I know if my thermostat housing is failing?
Common signs of a faulty thermostat or housing include the engine overheating at low speeds, visible coolant leaks or chalky residue around the housing, or erratic temperature gauge readings.
Is the thermostat included with this housing?
Yes, this is a complete assembly that includes the housing, a pre-installed 120°F (50°C) thermostat, the O-ring seal, and a new clamp. It is ready for installation out of the box.
Why is my engine overheating after installation?
If overheating occurs after installing the new assembly, check for airlocks in the cooling system, ensure hoses are correctly connected and unclogged, and verify the cooling system was refilled to the proper level. Also, confirm the water pump is functioning correctly.
My engine's serial number isn't listed. Can I still use this part?
To ensure proper fit and function, we strongly advise against using this part if your engine's model and serial number are not explicitly listed. Even small differences can lead to leaks or improper cooling.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
What are your shipping speed and cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an Original Equipment Manufacturer (OEM) component.
- Professional installation is highly recommended for safety and to ensure proper performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — With free standard delivery to most regions, you can expect your parts in 5–15 days.
- Manufacturer-Direct Value — We deliver fair pricing on quality components by eliminating intermediary costs without compromising on materials or QC.
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