Water Pump Body Gasket – Fits Mercury Marine & MerCruiser Engines (Replaces 27-94914)

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Product Details

This is a direct replacement Water Pump Body Gasket – Fits Mercury Marine & MerCruiser Engines (Replaces 27-94914). It is designed for a precise fit on a wide range of MerCruiser inboard and sterndrive marine engines, including many V6 and V8 models manufactured between 1977 and 2001.

This gasket serves as a direct interchange for Mercury part numbers 27-94914 and 27-72780, as well as aftermarket equivalents like Sierra 18-0386 and GLM 32730.

Installation Method: Direct Replacement
Operating Environment: Designed for use in sea water pumps
Included Components: One water pump body gasket

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Mercury	27-94914
Mercury	27-72780
Sierra	18-0386
GLM	32730

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This gasket fits a broad array of MerCruiser engines. Please verify your specific model and year to ensure correct fitment.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
MerCruiser	50 (Multiple Models)	50	4-Stroke	1983	27-94914	Models include 503B3A, 503C4B, 503H3A, 503H4B, etc.
MerCruiser	200 (2 BBL.) GM 305 V-8	200	4-Stroke	1985–1987	27-94914
MerCruiser	228/230/260 (4 BBL.) GM 305 V-8	228-260	4-Stroke	1982–1987	27-94914
MerCruiser	260 GM 350 V-8	260	4-Stroke	1982–1987	27-94914
MerCruiser	300 TEMPEST GM 350 V-8	300	4-Stroke	1985–1986	27-94914
MerCruiser	320 (EFI) GM 350 V-8	320	4-Stroke	1988–1989	27-94914
MerCruiser	330 GM 454 V-8	330	4-Stroke	1977–1987	27-94914
MerCruiser	340 MIE W/B/W GM 454 V-8	340	4-Stroke	1981–1987	27-94914
MerCruiser	350 MAG Series	350	4-Stroke	1987–1997	27-94914	Multiple variants (Alpha, Bravo, EFI, MPI)
MerCruiser	370/400 TRS GM 454 V-8	370-400	4-Stroke	1978–1986	27-94914
MerCruiser	420-425 GM 454 V-8	420-425	4-Stroke	1987–1993	27-94914
MerCruiser	440-450 GM 454 V-8	440-450	4-Stroke	1983–1996	27-94914
MerCruiser	454 Series	454	4-Stroke	1988–1997	27-94914	Multiple variants (MAG, EFI, MPI)
MerCruiser	460 TRS GM 482 V-8	460	4-Stroke	1983–1986	27-94914
MerCruiser	465-500 GM 502 V-8	465-500	4-Stroke	1990–1998	27-94914
MerCruiser	500 Bulldog GM 540 V-8	500	4-Stroke	1990–2001	27-94914
MerCruiser	525 SC GM 454/502 V-8	525	4-Stroke	1991–1998	27-94914
MerCruiser	575 GM 540 V-8	575	4-Stroke	1986–1992	27-94914
MerCruiser	600 SC GM 502 V-8	600	4-Stroke	1991–1998	27-94914
MerCruiser	800-900 SC GM 572 V-8	800-900	4-Stroke	1993–2000	27-94914
MerCruiser	5.0L (2 BBL.) GM 305 V-8	5.0L	4-Stroke	1988–1995	27-94914
MerCruiser	5.0LX (4 BBL.) GM 305 V-8	5.0L	4-Stroke	1988–1995	27-94914
MerCruiser	5.7L Series	5.7L	4-Stroke	1985–1997	27-94914	Multiple variants (Alpha, Bravo, EFI, TBI)
MerCruiser	7.4L Series	7.4L	4-Stroke	1988–1997	27-94914	Multiple variants (MIE, Bravo, MPI, TBI)
MerCruiser	8.2L Series	8.2L	4-Stroke	1990–1997	27-94914	Multiple variants (MIE, MPI, Hurth)
MerCruiser	SKI Series (Various)	Various	4-Stroke	1985–2002	27-94914	Competition, Black Scorpion & MX variants

Technical Specs

Product Type: Water Pump Body Gasket
Installation: Direct Replacement
Housing Material: OEM-equivalent Material
Dimensions: 6.0 in × 7.13 in × 0.13 in
Weight: 0.009 kg (0.32 oz)
Warranty: 1 year factory warranty
Other Technical Attributes: Used in sea water pumps

What’s in the Box

1 x Water Pump Body Gasket (27-94914)

Installation Notes

Disconnect the vessel's battery and close the seacock to prevent water ingress.
Drain the seawater section of the cooling system.
Loosen and remove the mounting bolts securing the sea water pump body.
Carefully remove the old gasket. Use a plastic scraper to clean any residual gasket material from both the pump body and its mounting surface. Ensure surfaces are clean, dry, and smooth.
Position the new gasket onto the mounting surface, aligning it with the bolt holes.
Reinstall the water pump body, ensuring the gasket is not pinched or misaligned.
Hand-tighten the mounting bolts, then torque them to the manufacturer's specified values in a crisscross pattern.
Open the seacock, reconnect the battery, and start the engine. Immediately check for any water leaks around the pump body.

Troubleshooting & FAQ

How do I confirm this gasket fits my specific MerCruiser engine?

The most reliable method is to check your engine's model number and year against the compatibility table provided above. You can also verify by cross-referencing your existing gasket's part number with those listed in the Part Number Matrix.

What are common signs of a failing water pump body gasket?

The most obvious sign is a visible water leak from the seam where the water pump body meets the engine block or bracket, especially when the engine is running. Other symptoms can include engine overheating or a low water pressure alarm if the leak is significant.

Do I need to use a sealant or adhesive with this gasket?

Generally, this type of gasket is designed to be installed dry. Applying sealant can sometimes interfere with a proper seal. However, always consult your engine's official service manual for model-specific recommendations.

How often should this gasket be replaced?

It is recommended to replace this gasket whenever the sea water pump is serviced, such as during an impeller change. It should also be replaced immediately if any leaks are detected.

Is this an OEM part or an aftermarket replacement?

This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.

What are the shipping speed and cost?

We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most regions. Expedited shipping options and exact costs will appear at checkout if available for your location.

What is the warranty and return policy?

This product 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 for items that are unused and in their original condition. See our policy page or reach out for instructions.

Safety & Important Info

Verify images and specifications against your original part before ordering. If anything differs—even if your model appears on the compatibility list—do not purchase.
This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
Professional installation is strongly recommended for safety, proper function, and 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 — We offer free standard delivery to most regions, with typical transit times 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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