When working on Mercury and Mariner outboards, having the right specialty tool can save hours of frustration. The Drive Shaft Retainer Wrench from Buckshot Racing #77 is engineered specifically for removing and installing drive shaft bearing retainers on Mercury / Mariner 30–300 HP outboard motors.
 
Built from heavy-duty steel and precision-machined, this tool ensures a secure, accurate fit while preventing damage to your gearcase components.
 
Built for Mercury and Mariner Outboards
This wrench is designed to fit a wide variety of outboards, from lightweight fishing motors to high-horsepower racing applications. It is the direct equivalent of OEM tools 43506, 43506T, 91-43506T, FT11293, and FT15691, making it a trusted alternative to Mercury factory equipment (MSRP of $92.54).
 
By matching OEM specifications, it provides both professional mechanics and DIY boat owners with the reliability needed to service critical lower-unit components without compromise.
 
Dimensions and Durability
Weighing 1.813 lbs and measuring 4.625 inches in length, 1.75 inches in width, and 5.875 inches in height, the Buckshot Racing #77 combines strength with portability. Its compact design makes it easy to store in any marine toolbox, while its robust build handles stubborn or corroded retainers with ease.
 
Unlike improvised tools, this specialty wrench grips securely, greatly reducing the risk of slippage or part damage—saving time and avoiding costly repairs.
 
Motor Model Fitment
The Buckshot Racing #77 is compatible with a wide range of Mercury and Mariner motors from 30 HP to 300 HP, covering EFI, carbureted, Jet, SeaPro, Pro XS, DTS, Marathon, and high-performance racing configurations.
 
Small to Mid-Range Outboards
This tool is essential for owners of smaller models such as the 30 HP EFI 3 Cyl, 30 Jet (3 Cyl), 35 HP, 40 HP EFI (3 Cyl & 4 Cyl), 40 HP Carb 4 Cyl, and 40 HP SeaPro EFI. It also supports popular mid-range engines like the 45 Jet, 50 HP EFI (3 & 4 Cyl), 50 HP Carb 4 Cyl, 55 HP 3 Cyl, and 60 HP EFI (3 & 4 Cyl Bigfoot).
 
Mid-Range Performance EFI / Jet Models
For performance-focused users, this wrench fits the 65 Jet, 75 HP (3 Cyl), 80 Jet, and 90 HP (3 Cyl) engines. It also supports advanced EFI models such as the 100 HP 4 Cyl, 110 Jet (2.5L), 115 EFI 4 Cyl, 115 V6 (2.5L), 125 HP 4 Cyl, and 135 HP V6 (2.5L).
 
V6 High-Performance Outboards
The wrench works perfectly with popular Mercury V6 platforms including the 140 International, 150 V6 (2.0L, 2.4L, 2.5L), 150 Pro XS (2.5L), 175 V6 (2.0L, 2.4L, 2.5L), and 175 Pro XS (2.5L). It also fits larger models such as the 200 EFI (3.0L), 200 HP V6 (2.4L & 2.5L), 200 DTS (3.0L), and 200 Pro XS (3.0L)—all staples in both recreational and performance boating.
 
Larger Outboards
For commercial and heavy-duty operators, the wrench covers the 225 EFI (3.0L), 225 DTS (3.0L), 225 Marathon (3.0L Carb), and 225 SeaPro (3.0L). It also handles larger motors including the 250 EFI (3.0L), 250 6 Cyl (3.0L), 250 Pro XS (3.0L), 250 XB (3.0L EFI), and the high-output 250R, 300R, and even the 450R 4.6L V8 Racing series.
 
High-Performance & Racing Applications
Beyond standard outboards, this wrench is trusted by racing professionals. It fits legendary performance motors such as the 225 HP Pro Max, 260 2.5 Liter EFI, 280 ROS 2.5L, 2.4 Bridgeport, 300 Drag, and the modern 300R. These engines demand precision and strength during service, and the Buckshot Racing #77 delivers exactly that.
 
Step-by-Step Instructions
Preparation: Secure the motor in a vertical position, drain the gear oil, and remove the propeller for clear access.
Accessing the Retainer: Disassemble the gearcase until the drive shaft bearing retainer is visible. Clean away any corrosion or debris before removing.
Wrench Operation: Fit the Buckshot Racing #77 securely onto the retainer, making sure the teeth engage fully. Use a breaker bar or ratchet to turn counterclockwise for removal. For reinstallation, torque the retainer to Mercury/Mariner specifications.
Reassembly: Rebuild the lower unit, refill with gear oil, and perform a test run to confirm smooth operation.
 
Professional Reliability
Marine technicians rely on this wrench because it delivers OEM-level performance without the OEM price tag. The heavy-duty steel construction ensures long-lasting durability, even in high-torque environments.
Its compact and portable size makes it equally effective in professional shops or mobile repair settings, while the precision-machined fit eliminates slippage and reduces wear on critical components.
 
With a Mercury MSRP of $92.54, the Buckshot Racing #77 Wrench is a more cost-effective investment that provides unmatched reliability and efficiency for any Mercury or Mariner owner.
 
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.