Mercruiser Prop Wrench Kit – Fits Mercury/Mercruiser Outboards & Sterndrives (91-859046Q3)
Mercruiser Prop Wrench Kit – Fits Mercury/Mercruiser Outboards & Sterndrives (91-859046Q3) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Mercruiser Prop Wrench Kit – Fits Mercury/Mercruiser Outboards &...
Product Details
This floating Mercruiser Prop Wrench Kit is an essential hand tool for installing and removing propellers on select Mercury/Mariner outboards (30–60 HP) and Mercruiser Alpha & Bravo 1 sterndrives (75–250 HP). Its bright orange color and floating design make it easy to spot and recover if dropped in the water.
It serves as a direct replacement for Mercury part numbers 91-856639A1, 91-859046Q3, and 91-859046T3.
- Installation: Simple hand tool for propeller nuts.
- Material: Durable, high-visibility plastic housing.
- Key Feature: Designed to float for easy recovery from water.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 91-856639A1 |
| Mercury | 91-859046Q3 |
| Mercury | 91-859046T3 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This tool is known to fit the following Mercury 4-Stroke applications. Due to incomplete OEM data, year ranges for other models are not available; please verify based on part number.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Mercury | 4-Stroke | 25 | 4-Stroke | 2006 and newer | 91-859046Q3 |
Technical Specs
- Product Type
- Floating Propeller Wrench
- Installation
- Hand tool
- Connection
- 15/16" socket
- Housing Material
- Plastic
- Housing Color
- Orange
- Dimensions
- Length: 42.0", Width: 12.0", Height: 6.0"
- Weight
- 0.45 lb (0.20 kg)
- Fitting Type
- Propeller nut socket
- Thread Size
- Fits 15/16" propeller nuts
- Other Technical Attributes
- Floating design for water recovery
What’s in the Box
- 1 x Floating Prop Wrench (91-859046Q3)
Installation Notes
- Ensure the engine is off, in neutral, and the ignition key is removed for safety.
- Remove the cotter pin from the propeller nut.
- Place the wrench's 15/16" socket onto the propeller nut.
- Turn the wrench counter-clockwise to loosen and remove the nut.
- To install, tighten the nut securely and replace the cotter pin. Do not over-torque.
Troubleshooting & FAQ
Will this wrench fit my specific engine model?
This wrench fits a wide range of Mercury/Mariner Outboards (30-60 HP) and Mercruiser Alpha/Bravo 1 sterndrives. It is confirmed for 25 HP Mercury 4-Strokes (2006+). For all other models, please verify your required part number is 91-859046Q3 or a superseded equivalent.
Why is the wrench so large and brightly colored?
The wrench is designed to float if dropped overboard during a propeller change on the water. The bright orange color makes it highly visible and easy to retrieve from the surface.
Is this a replacement for the metal prop wrench?
Yes, this plastic floating wrench replaces older metal versions like 91-856639A1. It is built to provide the necessary torque while offering the benefit of being rustproof and buoyant.
What are the signs I need a new propeller wrench?
If your current wrench is cracked, stripped, rusted, or no longer fits the propeller nut snugly, it should be replaced. A damaged wrench can strip the nut, making propeller removal difficult.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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