AMKITMER323 Annual Maintenance Kit for Mercury 9.9HP 13.5HP 15HP | JLM Marine

Annual Maintenance Kit for Mercury 9.9HP 13.5HP 15HP Outboard Motors

This comprehensive annual maintenance kit is designed for Mercury 9.9HP, 13.5HP, and 15HP outboard motors, covering both 2-cylinder 232cc and 323cc 4-stroke carbureted models. It includes all essential components needed for a complete service: water pump rebuild parts, thermostats, filters, gaskets, seals, anodes, and a gear oil pump to keep your engine running at peak performance.

Direct Replacement for OEM Part Number: AMKITMER323. This kit consolidates multiple Mercury service components into one package, ensuring compatibility across a wide range of serial number ranges from 0G590000 through 1B727495 and beyond.

• Complete annual service solution with 27 individual components including water pump, thermostat, fuel filter, oil filter, and seals
• Fits 4-stroke carbureted motors in 9.9HP (232cc & 323cc), 13.5HP (Non-Bigfoot), and 15HP (Non-Bigfoot) configurations
• Includes gear oil pump and drain gaskets for convenient lower unit 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 comprehensive annual maintenance kit includes 27 essential components for complete engine service:

• 46-42040A5 Housing x1
• 12-191833 Gasket x2
• 27-19202 Gasket x1
• 27-19204-3 Gasket x1
• 26-413651 Oil seal x2
• 47-42038-2 Impeller x1
• 12-16448 Gasket x2
• 19643 Gasket x2
• 42200 Plate x1
• 42089A2 Housing x1
• 421021 Seal x1
• 42376A2 Key x1
• 10-48408 Screw x1
• 42375 Plate x1
• 26-33613 Seal x1
• 26-42133 Seal x1
• 25-822236 Seal x1
• 825212A1 Thermostat x1
• 27-8M0177107 Thermostat Gasket x1
• 27-825701 Thermostat Gasket x1
• 35-80365M Fuel filter x1
• 35-816296Q03 Fuel filter x1
• 35-822626Q03 Oil filter x1
• 8M007119 Drain Gasket x1
• 8M0204693 Drain Gasket x2
• 42121Q02 Anode x1
• 24OP149 Gear Oil Pump x1

Installation Guide

1. Prepare the workspace: Ensure the engine is off, cool, and the boat is securely positioned. Gather all necessary tools including screwdrivers, wrenches, and a clean work surface.
2. Replace the water pump components: Remove the lower unit following your engine's service manual. Disassemble the water pump housing and replace the impeller (47-42038-2), housings, gaskets, and seals with the new components from this kit.
3. Install new thermostat: Locate the thermostat housing on the engine block. Remove the old thermostat (825212A1) and gaskets (27-8M0177107, 27-825701), clean the mating surfaces thoroughly, and install the new thermostat with fresh gaskets.
4. Replace fuel filters: Remove the old fuel filters (35-80365M and 35-816296Q03) from the fuel lines. Install the new filters ensuring correct flow direction (arrow markings on filter body).
5. Change oil filter: Drain the engine oil completely, then remove and replace the oil filter (35-822626Q03). Use the drain gaskets (8M007119, 8M0204693) when reinstalling the drain plug.
6. Service the lower unit: Use the included gear oil pump (24OP149) to drain old gear oil from the lower unit. Inspect for metal shavings or water contamination, then refill with fresh gear oil to the proper level.
7. Replace seals and gaskets: Install all new seals (26-413651, 421021, 26-33613, 26-42133, 25-822236) and gaskets (12-191833, 27-19202, 27-19204-3, 12-16448, 19643) in their respective positions according to your service manual.
8. Install the anode: Remove the old sacrificial anode (42121Q02) from the lower unit and replace it with the new one. Ensure metal-to-metal contact for proper corrosion protection.
9. Reassemble the lower unit: Install plates (42200, 42375), key (42376A2), and secure the housings with the provided screw (10-48408). Torque all fasteners to manufacturer specifications.
10. Reconnect and refill: Reattach the lower unit to the engine, reconnect all hoses and fuel lines. Refill engine oil to the proper level and check all connections for leaks.
11. Prime and test: Prime the fuel system by pumping the primer bulb until firm. Start the engine and verify proper water flow from the cooling system tell-tale.
12. Final inspection: Run the engine at idle for several minutes, checking for leaks, proper temperature, and smooth operation. Test at various RPMs and verify all functions before returning to service.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific Mercury engine?
A: Cross-reference your engine's serial number with the compatibility table above. The serial number is located on the mounting bracket or transom clamp; use our Mercury Serial Number Guide link to help identify your exact model and year.

Q: How often should I perform this annual maintenance?
A: Mercury recommends a full service annually or every 100 operating hours, whichever comes first. If you operate in saltwater, sandy conditions, or commercially, consider servicing more frequently (every 50-75 hours).

Q: What are the signs that my water pump impeller needs replacement?
A: Common symptoms include reduced water flow from the tell-tale, engine overheating, steam from the engine cover, or decreased performance. If you notice any of these signs, inspect and replace the impeller immediately to prevent engine damage.

Q: Can I install this kit myself or do I need a professional?
A: If you have mechanical experience and the proper tools, you can install this kit following the engine service manual. However, professional installation is recommended to ensure all components are correctly installed and torqued to specifications.

Q: Why does this kit include two fuel filters?
A: Different Mercury engine configurations within the 9.9HP-15HP range use different fuel filter designs. This kit includes both variants (35-80365M and 35-816296Q03) to ensure compatibility; install the filter that matches your engine's original configuration.

Q: What's the difference between OEM and aftermarket parts?
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.