Sierra Prop Shaft 18-2288 for Evinrude 25D/40/48/50 HP Outboards

The Sierra 18-2288 is a machined prop shaft engineered as a direct-fit driveline component for select Evinrude outboard motors. As the shaft that connects the outboard's lower unit gearcase to the propeller, it transmits rotational power from the forward and reverse gear set to the prop, so its dimensional accuracy and finish directly affect smooth power transfer and gearcase alignment. The shaft carries a machined exterior finish for consistent fit against the gear set and clutch components it works alongside in the lower unit.

This part is built for Evinrude 25D, 40, 48, and 50 HP (2 Cylinder) outboards across the model years listed below. Always confirm your outboard's horsepower rating, model year, and cylinder configuration against the fitment table before ordering, since Sierra assigns different prop shaft part numbers to other Evinrude horsepower ranges and years.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2288
• Product Type: Prop Shaft
• Finish: Machined
• Weight: 2.92 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 808282236052

Fitment

• Evinrude 25D, 1989-95, ALL models
• Evinrude 40 HP, 1989-97, ALL models
• Evinrude 48 HP, 1989-96, ALL models
• Evinrude 50 HP (2 Cyl.), 1989-97

Frequently Asked Questions

What outboards does the Sierra 18-2288 prop shaft fit? The 18-2288 fits Evinrude 25D outboards from 1989-95, Evinrude 40 HP outboards from 1989-97, Evinrude 48 HP outboards from 1989-96, and Evinrude 50 HP 2 Cylinder outboards from 1989-97, all model configurations listed as ALL for those horsepower and year combinations.

Is there an OEM cross-reference number for this prop shaft? No separate OEM cross-reference or replaces number is listed for this part; 18-2288 is the part number to use when ordering or verifying fit against your outboard's parts diagram.

How much does the 18-2288 prop shaft weigh? The Sierra 18-2288 prop shaft weighs 2.92 pounds.

What finish does the 18-2288 prop shaft have? This prop shaft has a machined exterior finish.

Will the 18-2288 fit a 50 HP Evinrude with a 3 cylinder engine? No. The 18-2288 is specified for the 50 HP 2 Cylinder Evinrude configuration from 1989-97; a 3 cylinder 50 HP Evinrude from 1997 uses a different Sierra prop shaft part number.

Does the 18-2288 come with the gear set or clutch? The 18-2288 listing covers the prop shaft only; the forward gear, reverse gear, and clutch used alongside it in the lower unit are separate, individually numbered components.

What are the dimensions of the 18-2288 prop shaft? The listed product dimensions for the Sierra 18-2288 are 0.39 x 0.39 x 0.39 inches.

Is the Sierra 18-2288 a genuine Sierra part or aftermarket? The 18-2288 is a genuine Sierra-branded prop shaft, identified by Sierra part number 18-2288 and UPC 808282236052.

Can I use the 18-2288 on a 40 HP Evinrude from the 1980s? Only if the engine falls within the 1989-97 model years listed for the 40 HP fitment; 40 HP Evinrude outboards built in 1984-88 use a different prop shaft part number.

What is in the box with the 18-2288 prop shaft? The 18-2288 ships as a single machined prop shaft component.