Water Pump Gasket – Fits Mercruiser V8 Sterndrives (Replaces 27-56880)
Water Pump Gasket – Fits Mercruiser V8 Sterndrives (Replaces 27-56880) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Gasket – Fits Mercruiser V8 Sterndrives (Replaces 27-56880)
Product Details
This is a direct replacement Water Pump Gasket – Fits Mercruiser V8 Sterndrives (Replaces 27-56880), designed for various Mercruiser sterndrives using Ford 302 and 351 V8 engines from 1970 through 1977. It ensures a proper seal for the engine's water pump.
This part provides a direct interchange for Mercury 27-56880, OMC 3852824, Sierra 18-0147, and GLM F724160, offering a reliable alternative to the NLA (No Longer Available) OEM part.
- Designed for use on various Mercruiser V8 sterndrives.
- Install during routine water pump service or replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/Mercruiser | 27-56880 |
| OMC | 3852824 |
| Sierra | 18-0147 |
| GLM | F724160 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mercruiser models, verify your engine model and serial number range to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercruiser | 215 (4 BBL.) FORD 302 V-8 | 215 | 4-Stroke | 1970–1972 | 27-56880 | Serial #2781153-3395720 |
| Mercruiser | 215 MIE FORD 302 V-8 | 215 | 4-Stroke | 1970–1972 | 27-56880 | Serial #2781153-3563181 |
| Mercruiser | 225 (4 BBL.) FORD 302 V-8 | 225 | 4-Stroke | 1973–1974 | 27-56880 | Serial #3385721-4166999 |
| Mercruiser | 225 MIE FORD 302 V-8 | 225 | 4-Stroke | 1973–1974 | 27-56880 | Serial #3385721-4176999 |
| Mercruiser | 225-S (4 BBL.) FORD 302 V-8 | 225 | 4-Stroke | 1973–1974 | 27-56880 | Serial #3385721-4166999 |
| Mercruiser | 233 FORD 351 V-8 | 233 | 4-Stroke | 1975–1977 | 27-56880 | Serial #4173000-4902304 |
| Mercruiser | 233 MIE FORD 351 V-8 | 233 | 4-Stroke | 1975–1976 | 27-56880 | Serial #4173000-4775784 |
| Mercruiser | 255 FORD 351 V-8 | 255 | 4-Stroke | 1973–1974 | 27-56880 | Serial #3258728-4175499 |
| Mercruiser | 255 MIE FORD 351 V-8 | 255 | 4-Stroke | 1973–1974 | 27-56880 | Serial #3258728-4178299 |
| Mercruiser | 888 (2 BBL.) FORD 302 V-8 | 888 | 4-Stroke | 1971–1977 | 27-56880 | Serial #3108723 and up |
| OMC | Various models | 4-Stroke | 3852824 | Cross-reference only, no specific model data |
Technical Specs
- Product Type
- Water Pump Gasket
- Installation
- Replace during water pump service
- Housing Material
- Paper/Composite
- Housing Color
- White
- Dimensions
- 13.0" H x 10.0" W x 1.13" L
- Warranty
- 30 days (Green Bay Propeller and Marine LLC)
- Other Technical Attributes
- For water pump on various Mercruiser V8 sterndrives
What’s in the Box
- 1 x Water Pump Gasket (27-56880)
Installation Notes
- Disconnect the negative battery cable before beginning work.
- Drain the engine cooling system to prevent spills.
- Remove the engine water pump housing and impeller assembly to access the old gasket.
- Carefully remove the old gasket. Ensure both mating surfaces on the engine block and pump housing are completely clean of old gasket material and debris.
- Position the new gasket correctly on the mounting surface.
- Reinstall the water pump assembly, tightening all bolts to the manufacturer’s specified torque.
- Reconnect all hoses, refill the cooling system, and check for leaks after starting the engine.
Troubleshooting & FAQ
How do I know if this is the right gasket for my engine?
This gasket fits specific Mercruiser sterndrives with Ford 302/351 V8 engines from 1970–1977. The best way to confirm is by matching your engine's model and serial number to the compatibility table. Cross-referencing your old part number with Mercury 27-56880 or Sierra 18-0147 is also a reliable method.
What are the signs of a bad water pump gasket?
Common symptoms include visible coolant leaks around the water pump housing, engine overheating, or a low coolant level warning. A worn or damaged gasket compromises the seal, allowing coolant to escape.
Should I use sealant with this gasket?
Most modern paper and composite gaskets like this one are designed to be installed dry. However, always consult your engine's service manual. If specified, apply a thin, even layer of a marine-grade gasket sealant to one side of the gasket.
How often should this gasket be replaced?
It is best practice to replace the water pump gasket whenever you service the water pump or its impeller, or immediately if you notice any signs of a leak. There is no fixed interval, as it depends on usage and conditions.
OEM vs. Aftermarket?
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.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
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/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.
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