Sierra 18-2174 Heavy Duty U-Joint, Replaces Mercury Marine 75832A3, Fits Alpha One SN B418819 & Above, Alpha One SS, Bravo

The Sierra 18-2174 is a heavy duty U-joint built as a direct replacement for the U-joint used on Mercruiser Alpha One drive units (S/N B418819 and above), Alpha One SS, and Bravo drives. It is constructed from alloy steel to handle the torsional loads transmitted through the drive shaft between the engine and outdrive, and it includes both a straight grease fitting and a 90 degree grease fitting so it can be serviced in tight installation clearances where a straight fitting cannot be accessed.

This U-joint is designed as a like-for-like replacement for the original equipment part, matching the fit and function of the OEM component it replaces. It ships as a single U-joint unit finished in brown/black alloy steel, ready to install in place of a worn or failing joint during routine outdrive maintenance or driveline repair.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2174
• Product Type: U-Joint
• Style: Heavy Duty
• Material: Alloy Steel
• Color: Brown
• Item Dimensions: 3.5 x 3.5 x 1.5 inches
• Weight: 1.21 pounds
• Grease Fittings Included: Straight and 90 degree
• UPC: 030999311764

Fitment

• Alpha I Units, S/N B418819 and above
• Alpha I SS
• Bravo

Replaces (OEM)

• 36312
• 41431
• 58749
• 75832
• 75832T
• 75832A1
• 75832A2
• 75832A3
• 758321
• 75832T1

Frequently Asked Questions

What does the Sierra 18-2174 U-joint fit? This U-joint fits Alpha I drive units with serial number B418819 and above, as well as Alpha I SS and Bravo drives.

Is the 18-2174 a direct replacement for the original Mercury Marine U-joint? Yes, the Sierra 18-2174 is built as a direct replacement for OEM U-joints including Mercury Marine part numbers 75832, 75832T, 75832A1, 75832A2, 75832A3, 758321, and 75832T1, along with 36312, 41431, and 58749.

What OEM part numbers does the 18-2174 cross-reference to? The 18-2174 replaces OEM numbers 36312, 41431, 58749, 75832, 75832T, 75832A1, 75832A2, 75832A3, 758321, and 75832T1.

How much does the U-joint weigh? The Sierra 18-2174 U-joint weighs 1.21 pounds.

What material is the 18-2174 U-joint made of? It is made of alloy steel, providing the strength needed to handle drive shaft torsional loads between the engine and outdrive.

Does the 18-2174 come with grease fittings? Yes, the 18-2174 U-joint includes both a straight grease fitting and a 90 degree grease fitting, allowing servicing in installations with limited clearance.

What are the dimensions of the 18-2174 U-joint? The U-joint measures 3.5 x 3.5 x 1.5 inches.

Will this U-joint work on an older Alpha I unit below serial number B418819? The 18-2174 is specified to fit Alpha I units at serial number B418819 and above, along with Alpha I SS and Bravo; it is not specified for units below that serial number.

What is included when I order the 18-2174? Each order includes one Sierra 18-2174 heavy duty U-joint with both straight and 90 degree grease fittings.

What color/finish is the 18-2174 U-joint? The 18-2174 U-joint has a brown alloy steel finish.

Does the 18-2174 fit Bravo drives? Yes, in addition to Alpha I (S/N B418819 & above) and Alpha I SS, the Sierra 18-2174 also fits Bravo drives.