Sierra 18-0386 Water Pump Body Gasket - Replaces 27-94914, 27-72780

The Sierra 18-0386 Water Pump Body Gasket seals the mating surface between the water pump body and the housing on applicable Mercruiser sterndrive engines, preventing raw water leakage at this joint during operation. It is manufactured to meet or exceed the quality of the original equipment part it replaces, making it a reliable choice when servicing or rebuilding a water pump assembly. This is a single gasket, sold individually, designed for a precise fit against the original mounting pattern so it seats correctly without additional trimming or modification.

This gasket is commonly replaced any time the water pump body is removed for service, such as during an impeller replacement, water pump rebuild, or when addressing a coolant or raw water leak at the pump housing. Installing a new gasket rather than reusing the old one helps ensure a proper seal and reduces the risk of leaks after reassembly. The part is identified by Sierra part number 18-0386 and directly corresponds to the OEM Mercruiser numbers listed below, so it can be cross-referenced against those part numbers when ordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0386
• Product Name: Water Pump Body Gasket
• Weight: 0.01 pounds
• Unit Count: 1 gasket per package
• UPC: 030999873675
• Category: Mercruiser Water Pumps and Impellers

Fitment

Fits Mercruiser sterndrive water pump assemblies that use OEM gasket 27-94914 or 27-72780.

Replaces (OEM)

• 27-94914
• 27-72780

Frequently Asked Questions

What does the Sierra 18-0386 Water Pump Body Gasket fit? The Sierra 18-0386 is designed for Mercruiser sterndrive water pump assemblies that use OEM gasket numbers 27-94914 or 27-72780, sealing the water pump body to its housing.

Is the 18-0386 gasket the same as Mercruiser 27-94914? Yes, Sierra part 18-0386 directly replaces Mercruiser OEM gasket 27-94914, along with 27-72780, and is built to meet or exceed the original equipment specification.

How many gaskets come in a package of the 18-0386? The Sierra 18-0386 Water Pump Body Gasket is sold as a single gasket per package, intended for one water pump body installation.

How much does the Sierra 18-0386 gasket weigh? This gasket weighs 0.01 pounds, consistent with its use as a thin sealing component rather than a structural part.

When should I replace the water pump body gasket? Replace the 18-0386 gasket any time the water pump body is removed, such as during impeller service or a water pump rebuild, to ensure a proper seal against leaks.

Is the Sierra 18-0386 an OEM part or aftermarket? The 18-0386 is a Sierra-manufactured aftermarket gasket engineered to meet or exceed the quality of the original Mercruiser equipment it replaces.

Can I reuse the old water pump gasket instead of installing a new one? Reusing an old gasket is not recommended; installing a new Sierra 18-0386 gasket during water pump service helps ensure a reliable seal and reduces the chance of leaks after reassembly.

Does the 18-0386 gasket require any trimming to fit? No, the Sierra 18-0386 Water Pump Body Gasket is manufactured to match the original mounting pattern, so it seats correctly without trimming or modification.

What OEM part numbers cross-reference to the Sierra 18-0386? The Sierra 18-0386 gasket cross-references to Mercruiser OEM numbers 27-94914 and 27-72780.

What is included when I order the 18-0386? Ordering the Sierra 18-0386 includes one water pump body gasket, sold individually rather than as part of a kit.