Sierra Shift Shaft Boot 18-2742, Replaces Mercury 85552

The Sierra Shift Shaft Boot, part number 18-2742, is a replacement boot designed to seal the shift shaft on Mercury outboard motors, keeping water and debris out of the shift linkage while allowing smooth, unobstructed shift shaft movement. This boot is a direct replacement for the original equipment part and is built to restore a proper watertight seal at the shift shaft bore, a common failure point as boots age, crack, or lose their seal over time from sun and saltwater exposure. Installing a fresh shift shaft boot helps prevent water intrusion into the lower unit and gearcase area around the shift shaft, protecting internal components from corrosion and contamination.

Sierra manufactures this boot to match the fit, dimensions, and function of the original Mercury outboard component it replaces, so it installs using the same mounting approach as the factory part. It is sold as a single boot (item packaging: one) and is a compact, lightweight part intended for straightforward replacement during routine outboard maintenance or lower unit service.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2742
• Product Name: Shift Shaft Boot
• Category: Mercury Outboard Parts
• Weight: 0.02 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Quantity: One
• UPC: 808282243753

Fitment

Fits Mercury outboard motors that use shift shaft boot 85552; specific horsepower and year ranges are not specified.

Replaces (OEM)

• 85552

Frequently Asked Questions

What does the Sierra 18-2742 shift shaft boot do? It seals the shift shaft on a Mercury outboard motor, preventing water and debris from entering the shift linkage area while still allowing the shaft to move freely for shifting.

Is Sierra 18-2742 a genuine OEM part or aftermarket? The Sierra 18-2742 is an aftermarket replacement boot manufactured to replace Mercury part number 85552.

Does 18-2742 cross-reference to a Mercury part number? Yes, Sierra part 18-2742 replaces Mercury part number 85552.

How much does the shift shaft boot weigh? The Sierra 18-2742 shift shaft boot weighs 0.02 pounds.

What are the dimensions of this shift shaft boot? The 18-2742 measures 0.39 x 0.39 x 0.39 inches.

How many boots come in a package of 18-2742? Sierra part 18-2742 is sold individually, one boot per package.

What outboard brand is the 18-2742 shift shaft boot designed for? This shift shaft boot, Sierra part 18-2742, is designed for Mercury outboard motors that use the 85552 shift shaft boot.

Does the listing specify which Mercury outboard models or horsepower this fits? Specific engine models, horsepower ratings, and year ranges are not specified for the 18-2742 shift shaft boot; fitment is based on the equivalent Mercury 85552 part.

Why would I need to replace the shift shaft boot? Shift shaft boots like the Sierra 18-2742 can crack or lose their seal over time from age and exposure, allowing water into the shift linkage area, so replacement restores a proper watertight seal.

What is the UPC for the Sierra 18-2742 shift shaft boot? The UPC for the Sierra 18-2742 shift shaft boot is 808282243753.