Thermostat Gasket – Fits Mercury (Replaces Mercury Quicksilver 27-47510Q)
Thermostat Gasket – Fits Mercury (Replaces Mercury Quicksilver 27-47510Q) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Thermostat Gasket – Fits Mercury (Replaces Mercury Quicksilver 27-4...
Product Details
This Thermostat Gasket – Fits Mercury (Replaces Mercury Quicksilver 27-47510Q) is designed for use in various Mercury and MerCruiser Stern Drive engine models, fitting within the thermostat assembly to ensure a proper seal.
It serves as a direct interchange for Mercury Quicksilver 27-47510Q, Osco 47510, GLM 31460, Mallory 9-60005, and Sierra 18-2553/18-2553-9.
- Sold individually.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury Quicksilver | 27-47510Q |
| Osco | 47510 |
| GLM | 31460 |
| Mallory | 9-60005 |
| Sierra | 18-2553/18-2553-9 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Mercury | [Various models] | 27-47510Q | Used in thermostat assembly |
| MerCruiser Stern Drive | [Various models] | 27-47510Q | Used in thermostat assembly |
Technical Specs
- Product Type
- Gasket
- Weight
- 0.009 kg (0.02 lbs)
- Dimensions
- 4.0" x 5.13" x 1.06"
- Other Technical Attributes
- Sold individually
What’s in the Box
- 1 x Gasket (27-47510Q)
Installation Notes
- Disconnect the negative battery terminal.
- Drain the engine coolant to a level below the thermostat housing.
- Remove the bolts securing the thermostat housing cover.
- Carefully remove the old gasket and thermostat. Clean both mating surfaces on the housing and cover thoroughly, ensuring they are free of old gasket material and corrosion.
- Place the new thermostat and gasket into the housing.
- Reinstall the housing cover and tighten the bolts to the manufacturer's specified torque in a crisscross pattern.
- Refill the cooling system with the appropriate coolant.
- Reconnect the battery, start the engine, and carefully check for any leaks around the thermostat housing as the engine warms up.
Troubleshooting & FAQ
Which specific Mercury or MerCruiser models does this gasket fit?
This gasket is a common replacement for a wide range of Mercury and MerCruiser Stern Drive engines. Because of its broad application, you must verify that the part number 27-47510Q is specified for your exact engine model and year before purchasing.
Where is this gasket installed?
This gasket is used to create a seal for the thermostat cover on the engine's thermostat housing.
How do I know if my old thermostat gasket has failed?
Common signs of a failed gasket include coolant leaks dripping from the thermostat housing, engine overheating alerts, or visible cracks and brittleness in the old gasket material upon visual inspection.
Is any sealant required when installing this gasket?
In most applications, this gasket is designed to be installed dry. However, always consult your engine's official service manual for specific recommendations, as some older models or specific conditions might call for a light application of a marine-grade sealant.
How often should I replace my thermostat gasket?
It is standard practice to replace the thermostat gasket any time the thermostat is replaced or the housing is removed for other service. This ensures a fresh, reliable seal.
What is the difference between this part and an OEM one?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. The part is manufactured in an ISO 9002 facility and is batch-inspected for quality and consistency.
How fast is shipping?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, and expedited options will appear at checkout if available for your region.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window, provided the part is unused and in its original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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