Gasket – Fits Mercury/Mercruiser Marine Engines (Replaces 27-8M0146938)

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Product Details

This high-quality Gasket – Fits Mercury/Mercruiser Marine Engines (Replaces 27-8M0146938) provides a reliable seal for various Mercury and Mercruiser engine applications, ensuring optimal performance and preventing leaks.

It serves as a direct interchange for OEM part number 27-8M0146938 from Mercury/Mercruiser.

Installation Type: Engine Component
Engineered to meet or exceed OEM specifications.
Package includes one gasket for a complete replacement.

Part Number Matrix

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

Brand	Part Number
Mercury/Mercruiser	27-8M0146938

Technical Specs

Product Type: Gasket
Installation: Engine Component
Dimensions: Length: 14.0 in, Width: 12.0 in, Height: 0.5 in
Weight: 0.04 lb (0.018 kg)
Other Technical Attributes: OEM Mercury Marine Part

What’s in the Box

1 x Gasket (27-8M0146938)

Installation Notes

Ensure the engine is completely cool and the battery is disconnected before starting.
Locate the old gasket and carefully remove the component it seals.
Thoroughly clean both mating surfaces, ensuring they are free of old gasket material, sealant, oil, and debris.
Position the new gasket correctly. Ensure it aligns with all bolt holes and passages.
Reinstall the component and tighten the fasteners to the manufacturer's recommended torque specifications and sequence.
After installation, reconnect the battery, start the engine, and carefully check for any leaks.

Troubleshooting & FAQ

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

The most reliable method is to match the part number 27-8M0146938 with your engine's service manual or the old part. While this gasket fits a range of Mercury/Mercruiser engines, visual comparison and part number verification are crucial.

Are any special tools required for installation?

Standard mechanic's tools, including a torque wrench, are typically sufficient. A gasket scraper (plastic or brass to avoid gouging) is also highly recommended for cleaning the mating surfaces.

What are common signs of a failed gasket?

Signs of a bad gasket include visible fluid leaks (oil or coolant), engine overheating, loss of compression, or a milky appearance in the engine oil, which could indicate coolant mixing with it.

Should I use sealant with this gasket?

Generally, modern gaskets are designed to be installed dry. However, always consult your engine's specific service manual. Some applications may call for a light coating of a specific type of sealant.

How can I tell if I have the correct gasket?

Compare the new gasket directly with your old one. Check that the shape, size, and all cutouts for bolt holes and fluid passages match perfectly before attempting installation.

What causes a gasket to fail prematurely?

Premature failure can result from improper installation (uneven torque, dirty surfaces), engine overheating, or an warped component surface that prevents a uniform seal.

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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