8M0097855 Maintenance Kit for Mercury Quicksilver 75HP 80HP 90HP 100HP 115HP | JLM Marine

8M0097855 Maintenance Kit for Mercury Quicksilver 75HP 80HP 90HP 100HP 115HP

This comprehensive maintenance kit is engineered for Mercury Quicksilver marine outboard motors rated 75HP through 115HP with 2.1L FourStroke engines (S/N 2B094996 and up). It consolidates essential service components—water pump repair kit, thermostat assembly, fuel filter, oil filter, and drain gaskets—into one complete package for convenient scheduled maintenance.

Direct Replacement for OEM Part Number: 8M0097855

• Includes OEM-spec water pump repair kit, thermostat with seals, fuel filter assembly, oil filter, and drain gaskets
• Designed for Mercury FourStroke 2.1L outboard motors from serial number 2B094996 onward
• Simplifies routine maintenance by bundling critical wear components in a single kit

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:

• 1× Water Pump Repair Kit (47-8M0100527)
• 1× Thermostat (8M0090819)
• 1× Thermostat Seals
• 1× Fuel Filter Assembly (35-879885Q)
• 1× Oil Filter (35-8M0162829)
• 1+3 Drain Gaskets (26-8M0007119 & 26-8M0204693)
• 1× Water Tube
• 1× Water Pump Base

Installation Guide

1. Preparation: Disconnect the fuel line and turn off the engine. Allow the motor to cool completely before beginning work.
2. Oil Filter Replacement: Locate the oil filter on the engine block, use an oil filter wrench to remove the old filter, and install the new filter from the kit. Tighten by hand until snug.
3. Fuel Filter Installation: Remove the old fuel filter assembly and replace it with the new 35-879885Q unit, ensuring all fuel line connections are secure and leak-free.
4. Water Pump Disassembly: Remove the lower unit from the engine to access the water pump housing. Take note of the impeller orientation before removal.
5. Water Pump Repair Kit Installation: Replace the impeller, gaskets, seals, water tube, and pump base using components from the 47-8M0100527 kit. Lubricate the impeller with glycerin or soapy water before installation.
6. Thermostat Replacement: Remove the thermostat housing cover, extract the old thermostat, and install the new 8M0090819 thermostat along with fresh seals.
7. Drain Gaskets: Replace all drain plug gaskets (26-8M0007119 & 26-8M0204693) on the lower unit and engine oil drain locations to prevent leaks.
8. Reassembly: Reinstall the water pump housing, lower unit, and thermostat cover, torquing all fasteners to manufacturer specifications.
9. Refill Fluids: Add the appropriate marine engine oil and lower unit gear lube to correct levels. Check for leaks around all newly installed gaskets and seals.
10. System Check: Reconnect the fuel line, start the engine, and allow it to reach operating temperature. Verify proper water flow from the telltale outlet.
11. Final Inspection: Check all connections for leaks, verify smooth engine operation, and ensure the cooling system is functioning properly.

Troubleshooting & FAQ

Q: How do I confirm this maintenance kit fits my Mercury outboard?
A: Verify your engine is a Mercury FourStroke 2.1L model rated 75–115HP with serial number 2B094996 or higher. Cross-reference your current part numbers with those listed in the package contents, or consult the Mercury parts diagrams linked above.

Q: How often should I perform this maintenance service?
A: Mercury recommends replacing the water pump impeller every 2–3 years or 300 hours of operation, whichever comes first. Oil and fuel filters should be changed annually or per the maintenance schedule in your owner's manual, and thermostats typically every 3–5 years depending on operating conditions.

Q: What are the signs that my water pump or thermostat needs replacement?
A: Watch for reduced or no water flow from the telltale outlet, engine overheating, erratic temperature gauge readings, or visible damage to the impeller blades. If you notice any of these symptoms, inspect and replace the water pump and thermostat immediately.

Q: Can I install this kit myself or do I need a professional mechanic?
A: If you have moderate mechanical experience and the proper tools, you can complete this maintenance. However, professional installation is recommended to ensure correct torque specifications, proper impeller orientation, and complete system functionality.

Q: Does this kit include everything I need for a complete service?
A: This kit provides the primary wear components for routine maintenance (water pump, filters, thermostat, and gaskets). You will need to supply engine oil, lower unit gear lube, and any additional fasteners or consumables as required by your specific service interval.

Q: Is this an OEM or aftermarket product?
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.