Mercury 40-60 HP EFI 4-Stroke 100 Hour Maintenance Kit – Fits Mercury Marine Outboard (Replaces 8M0090558, 8M0232733)

Mercury 40-60 HP EFI 4-Stroke 100 Hour Maintenance Kit – Fits Mercury Marine Outboard (Replaces 8M0090558, 8M0232733)

This 100-hour service kit provides the essential components needed for routine maintenance on Mercury Marine 40-60 HP 4-Stroke EFI 4-cylinder outboard engines. Regular service helps maintain engine performance, reliability, and longevity.

This kit is a direct replacement for Mercury OEM part numbers 8M0090558 and 8M0232733, as well as SOXAMarine 8M0090558.

• Provides all necessary filters, gaskets, and a thermostat for a standard 100-hour service.
• Specifically designed for 40, 50, and 60 HP Mercury 4-Stroke EFI 4-cylinder outboards.
• Engineered to meet or exceed original equipment specifications for fit and function.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Thermostat (Replaces 8M0117413/8M0168892)
• 1 x Thermostat Gasket (Replaces 824853/887978)
• 1 x Fuel Filter Assembly (low pressure) (Replaces 35-879884T)
• 1 x Fuel Filter (high pressure) (Replaces 35-8M0153652)
• 1 x Oil Filter (Replaces 35-8M0162829)
• 1 x Drain Gasket (Replaces 8M0007119)
• 3 x Drain Gasket (Replaces 830749/8M0204693)

Installation Guide

Always consult your owner's manual for detailed procedures and safety precautions. The general steps are as follows:

1. Prepare the engine by running it for a few minutes to warm the oil. Shut off the engine and disconnect the battery.
2. Position a drain pan under the gearcase drain screw. Remove the screw and drain the old engine oil completely.
3. Locate and replace the old oil filter with the new one provided. Lightly oil the gasket on the new filter before installation.
4. Replace the drain screw gasket and reinstall the drain screw.
5. Locate and replace both the low and high-pressure fuel filters. Ensure connections are secure to prevent leaks.
6. Replace the thermostat and its corresponding gasket.
7. Refill the engine with the manufacturer-specified type and amount of new outboard engine oil.
8. Check the oil level using the dipstick. Clean up any spills.
9. Reconnect the battery, start the engine, and check for any leaks from the filters or drain plug.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific Mercury outboard?

A: The surest way is to match your engine's serial number, horsepower (40, 50, or 60 HP), and type (4-Stroke EFI 4-Cylinder) against the information in the 'Compatible Engine Models' table. If you are unsure, use the Mercury Serial Number Guide linked above or contact us with your engine details.

Q: How often should I use this 100-hour maintenance kit?

A: This kit is designed for scheduled maintenance intervals. You should perform the service every 100 hours of engine operation or annually, whichever comes first. Sticking to this schedule is crucial for engine health.

Q: Why are there different part numbers listed for some components?

A: Manufacturers often update parts over time, leading to new part numbers (supersessions). The part numbers listed reflect these updates. The components in our kit are designed to replace all listed variations, ensuring compatibility.

Q: What are the signs my engine needs this service?

A: Aside from reaching the 100-hour/1-year interval, you may notice decreased performance, rough idling, or difficulty starting. Performing this regular maintenance helps prevent these issues from occurring.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.