8M0181314 Maintenance Service Kit for Mercury Mariner 2.5HP 3.5HP | JLM Marine

Maintenance Service Kit for Mercury Mariner 2.5HP 3.5HP Outboard Engines – OEM 8M0181314

This comprehensive maintenance service kit is designed for Mercury Mariner 2.5HP and 3.5HP outboard engines. It provides all the essential components needed for routine maintenance and service, helping to keep your engine running smoothly and reliably season after season.

This kit directly replaces Mercury Mariner Quicksilver part number 8M0181314 and aftermarket equivalent 47-16154-3, ensuring broad compatibility with your original equipment.

• Complete service kit with impeller, thermostat, gaskets, seals, and hardware
• Fits Mercury Mariner 2.5HP and 3.5HP outboard motors
• Replaces OEM 8M0181314 for cost-effective 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 service kit includes the following components:

• 1 x Impeller 47-16154-3
• 1 x Pin Key 28-16155
• 1 x Thermostat 804540
• 1 x Gasket 8035161
• 1 x Oil Seal 26-95348
• 2 x Drain Gasket 27-95220
• 1 x O-ring 25-16131
• 1 x Cotter Pin 95295
• 2 x Pin 17-815111Q02

Installation Guide

1. Preparation: Disconnect the fuel line and remove the engine cover. Ensure the engine is cool and positioned securely.
2. Remove Lower Unit: Drain the lower unit gear oil completely. Unbolt and carefully remove the lower unit from the engine.
3. Access Water Pump: Remove the water pump housing cover by unscrewing the retaining bolts. Take note of component orientation.
4. Remove Old Impeller: Extract the old impeller, pin key, and gaskets. Inspect the housing for wear or corrosion.
5. Install New Components: Insert the new pin key 28-16155 into the drive shaft slot. Lubricate the new impeller with water or glycerin and install it carefully.
6. Replace Gaskets & Seals: Install the new gasket 8035161, O-ring 25-16131, oil seal 26-95348, and drain gaskets 27-95220 in their respective positions.
7. Install Thermostat: Place the new thermostat 804540 into its housing, ensuring proper seating and orientation.
8. Reassemble Water Pump: Reinstall the water pump housing with new gaskets. Torque bolts to manufacturer specifications in a cross pattern.
9. Reattach Lower Unit: Align the lower unit with the drive shaft and secure with bolts. Refill with fresh lower unit gear oil.
10. Secure Hardware: Install cotter pin 95295 and pins 17-815111Q02 as specified in your engine's service manual.
11. Test Operation: Reconnect fuel line, start the engine in a test tank, and confirm water discharge from the tell-tale. Check for leaks.
12. Final Check: Reinstall engine cover and verify all fasteners are secure. Dispose of old parts responsibly.

Troubleshooting & FAQ

Q: How do I know if this kit fits my Mercury Mariner engine?
A: This kit is designed specifically for Mercury Mariner 2.5HP and 3.5HP outboard engines. Verify your engine's horsepower rating on the identification plate and cross-reference the OEM part number 8M0181314 with your service manual or parts diagram.

Q: How often should I replace the impeller and service components?
A: Mercury recommends replacing the water pump impeller annually or every 100 hours of operation, whichever comes first. Regular maintenance prevents overheating and extends engine life, especially in saltwater or sandy conditions.

Q: What are the signs that my impeller needs replacement?
A: Common symptoms include weak or no water flow from the tell-tale, engine overheating, steam from the engine, or loss of power. Inspect the impeller annually even if symptoms aren't present, as rubber degrades over time.

Q: Can I install this kit myself or do I need a mechanic?
A: If you have basic mechanical skills and tools, you can install this kit following the service manual. However, professional installation is recommended if you're unfamiliar with lower unit removal or water pump service procedures.

Q: Does this kit include everything I need for a complete service?
A: Yes, this kit includes the impeller, thermostat, gaskets, seals, O-ring, pins, and hardware needed for routine water pump and cooling system maintenance. You may need fresh lower unit oil separately.

Q: Is this an OEM part or aftermarket replacement?
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.