8M0097854 Maintenance Kit for Mercury 75HP 90HP 100HP 115HP | JLM Marine

8M0097854 Maintenance Kit for Mercury 75HP 90HP 100HP 115HP

This comprehensive maintenance kit is engineered for Mercury outboard engines rated at 75–115 HP (2.1L). It consolidates essential service components into one package, simplifying routine maintenance and ensuring your engine runs at peak performance.

This kit directly replaces OEM part number 8M0097854, providing a cost-effective solution for regular service intervals without compromising on quality or reliability.

• Includes oil filter, fuel filter, lower unit drain gaskets, and gear oil pump
• Designed for Mercury 2.1L mid-range outboards
• Consolidates multiple service parts for convenient maintenance

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

This maintenance kit includes the following components:

• 8M0065104 (Oil Filter) × 1
• 879885Q (Fuel Filter) × 1
• 830749.0 (Lower Unit Drain Gasket) × 2
• 24OP149 (Gear Oil Pump) × 1
• 830749 (Lower Unit Drain Gasket) × 2

Installation Guide

1. Prepare the engine: Ensure the outboard is off, cool, and secured in an upright position. Gather necessary tools including wrenches, a drain pan, and clean rags.
2. Replace the oil filter: Locate the oil filter on the engine block, unscrew the old filter using a filter wrench, and install the new 8M0065104 oil filter hand-tight.
3. Replace the fuel filter: Disconnect fuel lines from the old 879885Q fuel filter, noting the flow direction. Install the new filter ensuring correct orientation and secure all clamps.
4. Drain lower unit: Position the drain pan beneath the lower unit and remove the drain and vent screws. Allow all old gear oil to drain completely.
5. Replace drain gaskets: Remove old 830749/830749.0 gaskets from drain and vent screws, clean the screw threads, and install new gaskets from the kit.
6. Refill lower unit: Using the 24OP149 gear oil pump, insert the nozzle into the lower drain hole and pump fresh gear oil until it flows from the upper vent hole.
7. Reinstall plugs: Quickly reinstall the upper vent screw with new gasket first, then the lower drain screw with new gasket. Tighten both to manufacturer specifications.
8. Check for leaks: Wipe all service points clean and inspect for oil or fuel leaks. Run the engine briefly and recheck all filters and drain plugs.
9. Dispose of fluids properly: Collect all used oil, fuel, and filters for proper disposal according to local environmental regulations.
10. Record maintenance: Log the service date and engine hours in your maintenance records for future reference.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Mercury engine?
A: This kit is designed for Mercury 75–115 HP engines with 2.1L displacement. Cross-reference your engine's model and serial number with the compatibility table above, or consult your owner's manual to verify the OEM part number 8M0097854 is specified for your model.

Q: How often should I perform maintenance with this kit?
A: Mercury recommends changing the oil filter and fuel filter every 100 hours of operation or annually, whichever comes first. Lower unit gear oil and gaskets should be serviced every 100 hours or seasonally, especially before winter storage.

Q: Can I use this kit if I'm missing just one component?
A: Yes, you can use individual components from this kit as needed. However, purchasing the complete kit is typically more cost-effective if you're due for comprehensive maintenance, and having spare gaskets on hand is always recommended.

Q: What are the signs that I need to replace these maintenance items?
A: Common indicators include difficulty starting, reduced engine performance, milky or metallic lower unit oil, visible fuel filter contamination, or oil filter leaks. Never wait for symptoms—follow the manufacturer's recommended service intervals.

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.