100-Hour Maintenance Kit – Fits Mercury Marine 40-60 HP (Replaces 8M0090558, 8M0232733)
100-Hour Maintenance Kit – Fits Mercury Marine 40-60 HP (Replaces 8M0090558, 8M0232733) 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
100-Hour Maintenance Kit – Fits Mercury Marine 40-60 HP (Replaces 8...
Product Details
This is a complete Mercury 40-60 HP EFI 4-Stroke 100 Hour Maintenance Kit, designed for Mercury Marine 40, 50, and 60 horsepower 4-Stroke EFI 4-cylinder outboard engines. It contains essential filters, gaskets, and a thermostat required for a standard 100-hour service, ensuring your engine runs smoothly and reliably.
This kit is a direct aftermarket replacement for Mercury OEM part numbers 8M0090558 and 8M0232733.
- Fits 40-60 HP 4-stroke EFI 4-cylinder Mercury outboards.
- Installed in the boat engine / Mercury Outboard.
- Includes all necessary filters and gaskets for a 100-hour service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury | 8M0090558 | 8M0232733 |
| Mercury | 8M0232733 | |
| SOXAMarine | 8M0090558 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury Marine engines, this kit is specifically for 4-cylinder EFI models in the 40-60 HP range.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | Outboard | 40 | 4-Stroke | 8M0090558/8M0232733 | EFI 4-Cylinder |
| Mercury | Outboard | 50 | 4-Stroke | 8M0090558/8M0232733 | EFI 4-Cylinder |
| Mercury | Outboard | 60 | 4-Stroke | 8M0090558/8M0232733 | EFI 4-Cylinder |
Technical Specs
- Product Type
- Outboard Maintenance Service Kit
- Installation
- Boat Engine, Mercury Outboard
- Fuel Type
- Gasoline
- Housing Material
- Aluminum
- Weight
- 7.2 ounces (0.2 kg)
- Warranty
- 30 Days
- Other Technical Attributes
- EFI 4-Cylinder 4-Stroke engine compatibility
What’s in the Box
- 1 x Thermostat (8M0117413/8M0168892)
- 1 x Thermostat Gasket (824853/887978)
- 1 x Fuel Filter Assembly (low pressure) (35-879884T)
- 1 x Fuel Filter (high pressure) (35-8M0153652)
- 1 x Oil Filter (35-8M0162829)
- 1 x Drain Gasket (8M0007119)
- 3 x Drain Gasket (830749/8M0204693)
Installation Notes
- Ensure the engine is off and cool before starting. Disconnect the battery for safety.
- Position a drain pan and remove the engine oil drain plug to empty the oil.
- Replace the old oil filter with the new one, applying a thin layer of new oil to the gasket before installation.
- Replace the low-pressure and high-pressure fuel filters. Check for proper fuel line connection.
- Access the thermostat housing, remove the old thermostat and gasket, and install the new components.
- Replace the drain plug gaskets and securely reinstall the plugs.
- Refill the engine with the correct type and amount of new marine engine oil.
- Reconnect the battery, check all connections for leaks, and start the engine to test for proper operation.
Troubleshooting & FAQ
Which specific Mercury engines is this kit for?
This kit is designed for Mercury 40, 50, and 60 HP 4-stroke outboard engines that are 4-cylinder and use Electronic Fuel Injection (EFI). Always verify your engine's model and serial number before ordering.
My old part number is 8M0090558. Will this kit fit?
Yes. The OEM part number 8M0090558 was superseded by 8M0232733. This aftermarket kit is designed to replace both of those part numbers.
What are the signs that my engine needs this service kit?
Besides following the recommended 100-hour service interval, signs of a clogged fuel filter can include rough idling, stalling, or a loss of power. Overheating may indicate a faulty thermostat.
Does this kit include engine oil?
No, this service kit does not include engine oil. You will need to purchase the manufacturer-recommended marine-grade oil separately.
Why are there multiple part numbers for some included components?
Manufacturers often update part numbers over time. The multiple numbers listed (e.g., for the thermostat) represent original and superseded parts that are functionally identical. The component you receive will fit as intended.
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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