Sierra 18-2035 Oil Seal, Replaces OMC 327031, for Evinrude Outboard Prop and Driveshaft

The Sierra 18-2035 Oil Seal is a direct-fit replacement seal designed for Evinrude outboard prop and driveshaft applications. It is built from durable metal with a machined finish, giving it the dimensional accuracy needed to maintain a reliable barrier against water intrusion and lubricant loss at the driveshaft and propeller shaft area of the lower unit. Keeping this seal in good condition is important for protecting the gear case from water contamination, which can lead to corrosion and premature bearing or gear failure if left unaddressed.

This seal carries the OMC 327031 cross-reference number, making it a straightforward replacement for boat owners servicing older Evinrude lower units where that part number is called for. The compact size (5.13 inches long, 4.0 inches wide, 1.25 inches high) and light 0.02-pound weight reflect its role as a small but critical sealing component rather than a structural part. It ships as a single oil seal unit, ready to be installed as part of routine lower unit maintenance or a full seal kit replacement.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2035
• Category: Evinrude Outboard Prop and Driveshaft Seals
• Material: Metal
• Finish: Machined
• Color: Black/Brown
• Dimensions: 5.13 inches L x 4.0 inches W x 1.25 inches H
• Weight: 0.02 pounds
• UPC: 030999309815
• Quantity: 1 oil seal

Fitment

Designed for Evinrude outboard prop and driveshaft applications.

Replaces (OEM)

• OMC 327031

Frequently Asked Questions

What does the Sierra 18-2035 oil seal replace? The Sierra 18-2035 oil seal is a direct cross-reference for OMC part number 327031, so it can be used wherever that OEM number is specified.

What is the Sierra 18-2035 used for? It is an oil seal for Evinrude outboard prop and driveshaft applications, sealing against water intrusion and lubricant loss in the lower unit around the driveshaft and propeller shaft.

What material is the 18-2035 seal made from? This oil seal is made from metal with a machined finish, in a black/brown color.

How much does the Sierra 18-2035 oil seal weigh? The 18-2035 oil seal weighs 0.02 pounds.

What are the dimensions of the Sierra 18-2035 oil seal? The seal measures 5.13 inches long, 4.0 inches wide, and 1.25 inches high.

How many seals come in one package? Each package of the Sierra 18-2035 contains one oil seal.

Is the Sierra 18-2035 a genuine OEM part or an aftermarket replacement? The 18-2035 is a Sierra-branded replacement seal that cross-references to OMC 327031, rather than an OMC-branded original part.

Will the 18-2035 oil seal fit my Evinrude outboard's lower unit? The 18-2035 is designated for Evinrude outboard prop and driveshaft applications where the OMC 327031 seal is called for; check that number against your outboard's parts diagram to confirm fitment.

Why does the driveshaft oil seal need to be replaced? A worn or damaged oil seal like the 18-2035 can allow water into the lower unit or let lubricant escape, both of which can lead to gear case corrosion and bearing or gear damage if not corrected.

Does the Sierra 18-2035 come with installation hardware or a gasket? No, the 18-2035 package includes only the oil seal itself; gaskets and other lower unit hardware are separate parts.

What is the UPC for the Sierra 18-2035 oil seal? The UPC for the Sierra 18-2035 oil seal is 030999309815.