Mercury MerCruiser Quicksilver Thermostat Sleeve 8M0214947
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Mercury MerCruiser Thermostat Sleeve 8M0214947
Part Number: 8M0214947 (service format: 23-8M0214947)
Brand: Mercury / Quicksilver
Product Type: Thermostat Retaining Sleeve (OEM)
System: MerCruiser Engine Cooling
Material: Plastic
Position: Inside thermostat housing ā locates and retains the thermostat in the housing assembly
Quantity Required: 1 per thermostat assembly
GTIN / UPC: 678633180538
Approximate Weight: 30 g
Supersedes: 806922, 17495 (selected assemblies)
Note: The SKU on this listing may display as 806922, which is the earlier superseded number. The current OEM part is 8M0214947 / 23-8M0214947.
What This Part Does
The 8M0214947 is a genuine OEM plastic sleeve that sits inside the thermostat housing on selected MerCruiser gasoline engines, locating and retaining the thermostat in the correct position within the housing assembly. It is part of the thermostat-housing stack alongside the thermostat, upper housing gasket, and lower housing gasket. Without the sleeve in serviceable condition, the thermostat can shift position in the housing, affecting cooling-system performance.
This is the thermostat sleeve only ā not the thermostat, housing gasket, or lower housing gasket. Each component in the thermostat assembly is a separate service part.
Compatible Applications
Confirm your engine model, serial number, and thermostat housing diagram before ordering. Mercury used several thermostat-housing configurations across these engines.
- MerCruiser 3.0L GM 181 L4 (selected serial ranges)
- MerCruiser 3.0L MPI (selected serial ranges)
- MerCruiser 350 MAG / 350 MAG EFI / 350 MAG MPI Ski (selected serial ranges)
- Additional MerCruiser V6 and V8 gasoline engines using the same thermostat-housing design (confirm by serial number)
Thermostat Assembly Context
In documented MerCruiser thermostat assemblies, 8M0214947 is shown installed alongside:
- 8M0109441 ā 160Ā°F Thermostat
- 806871 / 8M0238323 ā Thermostat Housing Gasket (upper)
- 530451 ā Lower Thermostat Housing Gasket (separate part)
- 863457A2 ā Thermostat Housing Assembly
When to Replace
- Sleeve is cracked, warped, or heat-damaged
- Thermostat is loose or not seating correctly in the housing
- Sleeve has become brittle or distorted on inspection
- Thermostat housing is being rebuilt and the original sleeve shows any deterioration
- Cooling-system service reveals damage to the thermostat-retaining components
Installation Notes
- Inspect the thermostat housing for corrosion, scale, and sealing-surface damage before reassembly
- Install the sleeve in the exact orientation shown in the applicable MerCruiser parts diagram
- Verify the thermostat seats correctly in the sleeve before tightening the housing
- Replace the housing gaskets (upper and lower) at the same time ā do not reuse compressed gaskets once the housing has been opened
- Follow Mercury service manual torque specifications for the thermostat housing fasteners
Part Number Cross-Reference
- Current OEM: 8M0214947 / 23-8M0214947
- Supersedes: 806922
- Also supersedes (selected assemblies): 17495
- Supersession chain: 806922 ā 8M0214947
Technical FAQ
Q: What is the difference between 806922 and 8M0214947?
A: 8M0214947 is the current OEM replacement for the earlier 806922. They are the same thermostat sleeve ā 806922 is the superseded number and 8M0214947 is the current service format. If your older parts manual or catalog lists 806922, order 8M0214947.
Q: Is this the thermostat or just the sleeve?
A: This is the sleeve only. The thermostat is a separate part ā 8M0109441 (160Ā°F). Both are typically serviced together when the thermostat housing is opened, but they must be ordered separately.
Q: Do I need to replace the sleeve every time I replace the thermostat?
A: Inspect the sleeve when the housing is open. If it is in good condition ā no cracks, no distortion, thermostat seats correctly ā it can be reused. Replace it if it shows any cracking, brittleness, warping, or allows the thermostat to move in the housing.
Parts Desk Insights
Best use case: Order 8M0214947 when rebuilding the thermostat housing on a supported MerCruiser gasoline engine, especially if the existing sleeve shows any cracking or the thermostat was found loose in the housing. It is most commonly needed during cooling-system overhaul or when the thermostat housing is being replaced.
Common issues: The most frequent mistake is overlooking the sleeve during thermostat service ā it is a low-cost part that is easy to miss in the parts diagram but plays an important role in keeping the thermostat correctly positioned. A cracked or brittle sleeve is common on older engines that have run through many heat cycles. Also confirm the SKU ā this product may display the earlier number 806922, which is the superseded reference for 8M0214947.
Related Parts
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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 ā 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 ā 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.