Mercury Propeller Wrench 1-1/16" 859046Q4 – OEM Service Tool
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Mercury Propeller Wrench 1-1/16" – 859046Q4
Part Number: 859046Q4 (Mercury catalog prefix: 91-859046Q4)
Brand: Mercury Marine (Quicksilver OEM)
Official Product Type: Propeller Wrench / Service Tool
Drive Size: 1-1/16"
System: Propeller Removal & Installation
Condition: New OEM
What It Does
The Mercury 859046Q4 is a genuine OEM service tool — a 1-1/16" propeller wrench purpose-built for removing and installing propeller nuts on selected Mercury outboard and MerCruiser sterndrive applications. The 91- prefix in Mercury’s catalog system designates this as a service tool, not a replacement part. This is the largest in Mercury’s propeller wrench series, used on higher-horsepower applications where the propeller nut takes a 1-1/16" drive. For smaller nut sizes, see the 15/16" wrench (859046M3) or the 13/16" wrench (859046M2).
Compatible Applications
- Selected higher-horsepower Mercury outboard engines requiring a 1-1/16" propeller nut wrench — verify by model and service manual
- Selected MerCruiser sterndrive applications with 1-1/16" propeller nuts — verify by model and service manual
Note: This is a service tool, not an engine-specific replacement part. Compatibility is determined by the propeller nut size on your engine. Confirm the correct wrench size in the Mercury service manual or parts diagram before ordering.
Dimensions
Wrench Size: 1-1/16" (fits 1-1/16" propeller nut flats)
Part Suffix: Q4 indicates current Quicksilver production revision
Supersedes / Alternate Part Numbers
- 859046Q4 — current Mercury OEM part number
- 91-859046Q4 — full catalog format with service tool prefix
Kit Contents
Single OEM propeller wrench. No additional components included.
Service Interval
This is a service tool — no replacement interval applies. Replace if the wrench is cracked, the drive is worn, or the socket no longer seats squarely on the nut flats. A worn wrench that slips on the nut can round the flats, making future propeller removal significantly harder.
Technical FAQ
Q: How do I know if I need the 1-1/16" wrench vs. the 13/16" or 15/16" versions?
Measure your propeller nut flats with a standard wrench or socket set before ordering. The 1-1/16" wrench is typically used on larger, higher-horsepower Mercury outboards and some MerCruiser sterndrive applications. Your Mercury service manual will specify the correct nut size and torque value for your engine. See also: 15/16" wrench (859046M3) and 13/16" wrench (859046M2).
Q: Can I use a standard 1-1/16" socket instead of this OEM wrench?
A standard 1-1/16" socket will often work, but the OEM wrench is designed for the specific depth and clearance profile of Mercury propeller nuts. On some applications, hub or thrust washer geometry limits access and requires a purpose-built tool to seat properly without damaging surrounding components.
Q: Should I use an impact wrench for propeller nut removal or installation?
Mercury service manuals specify hand-torque with a torque wrench for propeller nut installation — not an impact driver. Impact wrenches risk over-torquing the nut or damaging propeller shaft threads. For removal only, brief impact use is sometimes done in the field, but installation must always be torqued by hand to the specification in your service manual.
Related Products
- Mercury Propeller Wrench 15/16" 859046M3 – OEM Service Tool
- Mercury Propeller Wrench 13/16" 859046M2 – OEM Service Tool
- Mercury Propeller Shaft Nut 858869 – 7/8"-14 UNF OEM
- Mercury Propeller Nut Kit 8M0056235
- Mercury MerCruiser Quicksilver Propeller Nut Kit 69578Q1
- Mercury Quicksilver Propeller Nut Kit 11-52707Q1
- Mercury Quicksilver Flo-Torq II Hub Kit 835257K6
Parts Desk Insights
Best Use Case: This is the right wrench for shops and serious DIY owners servicing larger Mercury outboards — typically 115 HP and above — or MerCruiser drives where the propeller nut is sized at 1-1/16". It’s a straightforward tool to have in the shop kit if you regularly pull props for inspection, cleaning, or replacement. Pairing it with a quality torque wrench makes propeller installation clean and repeatable.
Common Issues: The most frequent problem is ordering the wrong size from the three available wrenches in this series. The 13/16", 15/16", and 1-1/16" versions look nearly identical — always confirm your nut size before ordering. The second common issue is using an impact driver for installation: propeller shaft threads on aluminum lower units are not forgiving of over-torque, and a stripped shaft is a costly repair that a torque wrench would have prevented.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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