Sierra 18-2557-9 Impeller Gasket - Replaces 332108 - Fits 3 Cylinder Outboards - Pack of 2

The Sierra 18-2557-9 Impeller Gasket is a replacement gasket engineered to seal the water pump impeller housing on 3 cylinder outboard engines. Sold as a pack of 2, it gives you a spare on hand for the next service interval or lets you replace both gaskets in a two-pump job without ordering twice. Each gasket measures 0.25 inches in thickness, matching the original equipment specification so the impeller housing seats correctly and maintains proper cooling water flow.

This gasket is manufactured to meet or exceed the quality of the original equipment part it replaces, helping prevent water intrusion and pump housing leaks that can lead to overheating. It is a straightforward, inexpensive part to swap during a routine impeller replacement or whenever the water pump housing is opened up for inspection.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2557-9
• Package Quantity: Pack of 2 gaskets
• Item Thickness: 0.25 inches
• Weight: 0.02 pounds
• UPC: 808282162917
• Fitment: 3 cylinder outboard engines
• OEM Cross Reference: 332108

Fitment

• 3 cylinder outboard engines

Replaces (OEM)

• 332108

Frequently Asked Questions

What does the Sierra 18-2557-9 impeller gasket fit? This gasket is designed for 3 cylinder outboard engines and seals the water pump impeller housing on that engine family.

How many gaskets come in a pack? The 18-2557-9 is sold as a pack of 2 gaskets, giving you a spare or enough for two separate installations.

What OEM part number does 18-2557-9 replace? It replaces OEM part number 332108, so it can be used as a direct equivalent for that reference number.

How thick is the 18-2557-9 gasket? Each gasket measures 0.25 inches thick, matching the original specification for a proper seal against the impeller housing.

How much does the Sierra 18-2557-9 weigh? The pack weighs 0.02 pounds, reflecting the lightweight nature of a thin gasket set.

Is this a genuine OEM part or an aftermarket replacement? The Sierra 18-2557-9 is an aftermarket gasket manufactured to meet or exceed the quality of the original equipment part it replaces, OEM number 332108.

When should I replace this gasket? Replace the 18-2557-9 gasket any time the water pump impeller housing is opened for an impeller swap or inspection, since a reused gasket can leak.

What is the UPC for this product? The UPC for the Sierra 18-2557-9 impeller gasket pack is 808282162917.

Can I use this gasket on a V-6 or V-8 engine? No, the 18-2557-9 is specified for 3 cylinder outboard engines only; V-4, V-6, and V-8 applications use a different Sierra gasket part number.

What is included in the package? The package contains 2 impeller gaskets, part number 18-2557-9, with no additional hardware included.