Sierra Head Gasket 18-2885, Replaces 303438, for Evinrude Outboard Power Heads

The Sierra Head Gasket 18-2885 is a power head gasket engineered for Evinrude outboard engines. It seals the mating surface between the cylinder block and cylinder head, maintaining proper compression and preventing coolant or combustion leaks at the power head. This gasket is a direct equivalent for OEM part number 303438, making it a straightforward replacement when rebuilding or servicing an Evinrude outboard power head.

Each gasket is sold as a single unit and is part of Sierra's line of Evinrude outboard power head gaskets, a category built around exact-fit sealing components for outboard engine rebuilds. Installing a proper power head gasket is a key step in restoring compression and preventing leaks after a head has been removed for service, inspection, or repair.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2885
• Category: Evinrude Outboard Power Head Gaskets
• Number of Items: 1
• Weight: 0.14 pounds
• UPC: 030999313928
• Replaces (OEM): 303438

Fitment

Designed for Evinrude outboard power heads.

Replaces (OEM)

• 303438

Frequently Asked Questions

What does Sierra part number 18-2885 fit? Sierra 18-2885 is a head gasket for Evinrude outboard power heads, used when resealing the cylinder head to the cylinder block.

Is 18-2885 the same as OEM part 303438? Yes, Sierra 18-2885 directly replaces OEM number 303438, so it can be installed in place of that original part.

How many gaskets come in a package of 18-2885? One gasket is included per package for Sierra part number 18-2885.

How much does the 18-2885 head gasket weigh? The Sierra 18-2885 head gasket weighs 0.14 pounds.

What is the UPC for Sierra 18-2885? The UPC for this head gasket is 030999313928.

When should a power head gasket like 18-2885 be replaced? A power head gasket such as the Sierra 18-2885 should be replaced any time the cylinder head is removed from an Evinrude outboard power head, or if compression loss or leakage is found at the head-to-block joint.

Is this a genuine Sierra part or aftermarket? Sierra 18-2885 is manufactured by Sierra as a replacement gasket engineered to match the fit and sealing performance of OEM part 303438.

Does the 18-2885 gasket require any additional sealant? The dossier does not specify sealant requirements for the Sierra 18-2885 head gasket, so follow the engine manufacturer's service procedure for the power head being resealed.

What engine brand is the 18-2885 gasket designed for? The Sierra 18-2885 head gasket is categorized specifically for Evinrude outboard power heads.

Can I reuse an old head gasket instead of buying 18-2885? Head gaskets like the Sierra 18-2885 are designed for one-time use and should be replaced with a new gasket, such as this one, whenever the head is removed.