Lower Water Pump Gasket – Fits Mercury/Mariner 30-60 HP EFI 4-Stroke (Replaces 27-8M4502052)
Lower Water Pump Gasket – Fits Mercury/Mariner 30-60 HP EFI 4-Stroke (Replaces 27-8M4502052) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Lower Water Pump Gasket – Fits Mercury/Mariner 30-60 HP EFI 4-Strok...
Product Details
This Lower Water Pump Gasket is designed for Mercury/Mariner 30-60 HP EFI 4-Stroke outboard engines (2002 and newer). It installs directly under the wear plate in the water pump assembly, ensuring a proper seal.
This part directly replaces Mercury/Mariner part numbers 27-197011, 27-8M0036675, 27-8M4502052, and the current OEM number 27-8M0224241.
- Fits under the water pump wear plate.
- Engineered for Mercury & Mariner 4-stroke and 2-stroke models.
- Note: This gasket does not fit Bigfoot models.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Mercury/Mariner | 27-197011 | 27-8M0036675 | |
| Mercury/Mariner | 27-8M0036675 | 27-8M4502052 | |
| Mercury/Mariner | 27-8M4502052 | 27-8M0224241 | |
| Mercury/Mariner | 27-8M0224241 | Current OEM Number |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mariner outboards:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | EFI | 30 | 4-Stroke | 2002–newer | 27-8M4502052 | Superseded by 27-8M0224241 |
| Mercury/Mariner | EFI | 35 | 4-Stroke | 2002–newer | 27-8M4502052 | Superseded by 27-8M0224241 |
| Mercury/Mariner | EFI | 40 | 4-Stroke | 2008–newer | 27-8M4502052 | Superseded by 27-8M0224241 |
| Mercury/Mariner | Standard | 40 | 4-Stroke | 2008–newer | 27-8M4502052 | Superseded by 27-8M0224241 |
| Mercury/Mariner | EFI | 50 | 4-Stroke | 2002–newer | 27-8M4502052 | Superseded by 27-8M0224241 |
| Mercury/Mariner | EFI | 60 | 4-Stroke | Most models | 27-8M4502052 | Superseded by 27-8M0224241 |
| Mercury/Mariner | AUTOLUBE | 50 | 2-Stroke | 1993–1998 | 27-8M4502052 | 3-Cylinder, superseded by 27-8M0224241 |
| Mercury/Mariner | Standard | 60 | 2-Stroke | All 3-Cylinder models | 27-8M4502052 | Superseded by 27-8M0224241 |
Technical Specs
- Product Type
- Lower Water Pump Gasket
- Installation
- Under Wear Plate
- Housing Material
- Gasket Material
- Dimensions
- 0.5 in x 12.0 in x 20.5 in
- Other Technical Attributes
- Does not fit Bigfoot models
What’s in the Box
- 1 x Lower Water Pump Gasket (Replaces 27-8M4502052 / 27-8M0224241)
Installation Notes
- Disconnect the negative battery cable. Ensure the engine is shifted into neutral.
- Remove the lower unit (gearcase) from the outboard motor.
- Unbolt and remove the water pump housing to access the internal components.
- Remove the old wear plate and the gasket located underneath it.
- Thoroughly clean the gasket mating surfaces, removing any old material or corrosion.
- Position the new lower gasket onto the clean surface.
- Reinstall the wear plate, impeller, and water pump housing, tightening bolts to the manufacturer's torque specifications.
- Apply marine grease to the driveshaft splines and reinstall the lower unit.
- Reconnect the battery, start the engine in water, and verify proper water flow from the tell-tale outlet.
Troubleshooting & FAQ
Will this gasket fit my Mercury 40HP Bigfoot model?
No, this gasket is specifically documented as not fitting Bigfoot models. Please verify your exact model specifications before ordering.
Where is this gasket located on the engine?
This is the lower water pump gasket, which fits directly underneath the water pump's metal wear plate inside the lower unit assembly.
What are the signs of a failed water pump gasket?
Common symptoms include the engine overheating at low or high speeds, a weak or non-existent water stream from the "tell-tale" outlet, or visible water leakage from the seams of the water pump housing.
Is this part the same as OEM?
This listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is engineered in an ISO 9002 certified facility to meet or exceed OEM specifications using comparable materials and is batch-inspected for quality and performance.
What is the shipping speed and cost?
We ship worldwide, with typical transit times of 5–15 days for most regions. Standard shipping is free. Expedited shipping options, if available for your location, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard return window for items that are unused and in their original condition.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If anything differs—even if your model appears on a compatibility list—do not purchase.
- This is an aftermarket replacement part, not an OEM component. All mentions of brand names and part numbers are for reference purposes only.
- Professional installation is highly recommended for safety and to ensure proper performance. Incorrect installation can lead to engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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