Sierra Lower Unit Seal Kit 18-2684 - Evinrude Outboard Gear Housing Shift Rod Gasket, Oil Seal and Spaghetti Seal

The Sierra Lower Unit Seal Kit 18-2684 is a complete reseal kit for Evinrude outboard gear housings (lower units), bundling the three seals most commonly needed together in one part number. The kit contains a shift rod gasket, an oil seal, and a spaghetti seal, each engineered to the same fit, form, and function as the original equipment part it replaces. Rather than sourcing three separate seals individually and risking a mismatch, installers can order this single kit number and have everything needed for a lower unit reseal in one box.

Each component in the kit corresponds to a specific original equipment part: the shift rod gasket (Sierra 18-0882) replaces OEM 304764, the oil seal (Sierra 18-2032) replaces OEM 321788, and the spaghetti seal (Sierra 18-4248) replaces OEM 309044. Sierra also cross-references this kit to Mallory 9-74105 and GLM 87606 for buyers searching under those numbers. The kit is intended for gear housing service where the shift rod seal, propeller shaft oil seal, and housing spaghetti seal are being replaced as part of a lower unit rebuild or leak repair.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2684
• Kit Contents: Shift Rod Gasket (18-0882), Oil Seal (18-2032), Spaghetti Seal (18-4248)
• Included Component OEM Numbers: 304764, 321788, 309044
• Weight: 0.14 pounds
• Dimensions: 0.39 x 0.39 x 0.39 inches
• Application: Evinrude outboard gear housing (lower unit)
• Color: White
• Item Form: Kit
• Number of Pieces: 3

Fitment

Designed for Evinrude outboard gear housing (lower unit) applications.

Replaces (OEM)

• Mallory 9-74105
• GLM 87606

Frequently Asked Questions

What does the Sierra 18-2684 lower unit seal kit include? The kit contains three seals for an Evinrude outboard gear housing: a shift rod gasket (Sierra 18-0882), an oil seal (Sierra 18-2032), and a spaghetti seal (Sierra 18-4248).

What OEM part numbers does this kit cross-reference to? The individual seals in kit 18-2684 correspond to original equipment numbers 304764 (shift rod gasket), 321788 (oil seal), and 309044 (spaghetti seal), and the kit as a whole is also referenced to Mallory 9-74105 and GLM 87606.

Is the Sierra 18-2684 kit made to OEM specifications? Yes, each seal in the 18-2684 kit is engineered to match the fit, form, and function of the original equipment part it replaces.

How much does the 18-2684 seal kit weigh? The Sierra Lower Unit Seal Kit 18-2684 weighs 0.14 pounds.

What are the dimensions of the 18-2684 seal kit packaging? The kit measures 0.39 x 0.39 x 0.39 inches.

What is a spaghetti seal used for in this kit? The spaghetti seal included in kit 18-2684 (Sierra 18-4248, replacing OEM 309044) seals the gear housing during lower unit assembly.

Does this kit include a shift rod gasket? Yes, kit 18-2684 includes a shift rod gasket, Sierra part 18-0882, which replaces OEM number 304764.

What application is the 18-2684 seal kit designed for? This kit is designed for Evinrude outboard gear housing (lower unit) service.

Can I buy the individual seals separately instead of the kit? The shift rod gasket, oil seal, and spaghetti seal are sold together under Sierra kit number 18-2684, which bundles all three components needed for a gear housing reseal into one part number.

How many pieces come in the Sierra 18-2684 kit? The 18-2684 kit contains 3 seal components: a shift rod gasket, an oil seal, and a spaghetti seal.

Is the 18-2684 kit backed by a warranty? Yes, the Sierra 18-2684 lower unit seal kit is backed by Sierra's warranty.