Mercury 40-60HP FourStroke EFI 100-Hour Maintenance Kit - 8M0232733
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The Mercury Quicksilver 8M0232733 is a genuine Mercury Marine OEM 100-hour maintenance kit for select Mercury and Mariner 40 HP, 50 HP, and 60 HP FourStroke EFI outboards. This factory service kit bundles the core replacement components normally used during annual or 100-hour maintenance, helping simplify routine oil, fuel, thermostat, and gearcase service.
This kit is intended for compatible 40–60 HP EFI outboards where the Mercury parts chart calls for 8M0232733 or its superseded reference 8M0090558.
Key Features
- Genuine Mercury Marine OEM maintenance kit.
- Mercury/Quicksilver part number: 8M0232733.
- Supersedes earlier Mercury reference 8M0090558.
- UPC reference: 745061616165.
- Designed for select Mercury and Mariner 40–60 HP FourStroke EFI outboards.
- Built for standard 100-hour / annual service.
- Includes key filters and sealing components for scheduled maintenance.
- Helps support clean engine oil, proper fuel filtration, cooling-system service, and gearcase drain sealing.
- Convenient all-in-one kit for seasonal maintenance and out-of-water service.
Typical Kit Contents
Factory kit contents may include:
- Engine oil filter
- Low-pressure fuel filter
- High-pressure fuel filter
- Oil drain plug seal
- Gearcase drain/fill sealing washers
- Thermostat
- Thermostat gaskets or seals
- Related service seals included in the factory package
Confirm the exact contents against the Mercury package and engine serial-number parts chart before beginning service.
Engine Compatibility
Common application context includes select Mercury and Mariner FourStroke EFI outboards where the factory service chart calls for 8M0232733, including:
- Mercury 40 HP FourStroke EFI outboards where specified.
- Mercury 50 HP FourStroke EFI outboards where specified.
- Mercury 60 HP FourStroke EFI outboards where specified.
- Select Mariner 40 HP, 50 HP, and 60 HP FourStroke EFI applications where specified.
- Common serial-number reference: 1C000001 and higher, where confirmed by Mercury parts lookup.
Use this kit only where the Mercury parts diagram or service chart specifically calls for 8M0232733.
Serial Number Fitment Notice
Confirm fitment by outboard serial number, horsepower, model year, fuel-system layout, thermostat design, filter configuration, and gearcase drain plug style before ordering. Mercury 40–60 HP FourStroke engines can use different service kits depending on production range and engine configuration, so horsepower alone is not enough to guarantee fitment.
When This Kit Needs Replacement
Use this kit during scheduled 100-hour or annual service, whichever comes first, or when performing seasonal recommissioning after storage. Replacement is also recommended when fuel filters are restricted, engine oil service is due, gearcase drain washers have been removed, the thermostat is being serviced, or maintenance history is unknown.
Installation Notes
Follow the Mercury service manual for the exact engine serial number. Warm and drain the engine oil as specified, replace the oil filter and drain seal, service the fuel filters carefully to avoid fuel leaks, and replace gearcase sealing washers whenever the drain or vent screws are removed.
When replacing the thermostat, clean the housing surfaces and replace the supplied gasket or seal. After service, refill with the correct Mercury-specified engine oil and gear lube, prime the fuel system as required, run the engine on a proper water supply, and check for oil, fuel, cooling-water, and gear-lube leaks.
Alternate/Superseded Part Numbers
- 8M0232733 — current Mercury/Quicksilver OEM 100-hour maintenance kit
- 8M0090558 — superseded Mercury service kit reference
- 745061616165 — UPC reference
Related Service Items
Depending on the service being performed, additional maintenance items may include Mercury 4-Stroke Marine Engine Oil, Mercury Premium Gear Lube or High Performance Gear Lube where specified, spark plugs, fuel stabilizer, water pump impeller kit, propeller hardware, and corrosion-control anodes. Confirm all related fluids and parts by engine serial number.
Parts Desk Insight
A 100-hour kit is the cleanest way to handle routine service because the filters and seals are bundled around a specific engine family. The most important step is confirming the outboard serial number before ordering, especially on 40–60 HP FourStroke models where filter and thermostat layouts can vary by production range. Always replace drain seals after removal to prevent oil or gear-lube seepage.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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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