8M0113483 Service Kit for Mercury 40HP 50HP 60HP | JLM Marine

Service Kit for Mercury 40HP 50HP 60HP – OEM 8M0113483

This comprehensive service kit is designed for Mercury 40 HP, 50 HP, and 60 HP EFI outboard engines with standard gear cases only. It consolidates all essential maintenance components—impeller, thermostats, filters, gaskets, and seals—into one complete package, streamlining your annual service or seasonal overhaul.

Direct Replacement for: Mercury OEM part number 8M0113483. This aftermarket kit meets OEM specifications and is manufactured to deliver reliable performance at a competitive price point.

• Includes 18 different components covering water pump, fuel system, oil filtration, and lower unit service
• Fits Mercury EFI models: 40/50/60 HP with standard gear cases
• Complete service solution for routine maintenance intervals

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 service kit includes 18 individual components to cover water pump, fuel, oil, and lower unit service:

• 47-19453T Impeller × 1
• 19700A2 Plate × 1
• 893857 Water Tube × 1
• 12-858234 Gasket × 2
• 28-19699 Key × 1
• 27-822189 Gasket × 1
• 27-19701 Gasket × 1
• 2642 Gasket × 4
• 25-62702 O-ring × 2
• 191833 Gasket × 3
• 8M0117413 Thermostat × 1
• 27-8M0177107 Gasket × 1
• 35-879884T Fuel Filter × 1
• 35-8M0153652 Fuel Filter × 1
• 35-8M0162829 Oil Filter × 1
• 8M007119 Drain Gasket × 1
• 830749 Drain Gasket × 3
• 24OP149 Gear Oil Pump × 1

Installation Guide

1. Preparation: Disconnect the fuel line and flush the engine with fresh water. Gather all necessary tools including screwdrivers, wrenches, and a drain pan.
2. Remove Lower Unit: Shift the engine into forward gear and remove the lower unit mounting bolts. Carefully slide the lower unit away from the engine, taking care not to damage the water tube or shift rod.
3. Water Pump Disassembly: Remove the water pump housing cover and extract the old impeller, plate, and gaskets. Inspect the water tube for corrosion or damage and replace if necessary (included in kit).
4. Install New Impeller: Lubricate the new impeller (47-19453T) with glycerin or soapy water. Insert it into the housing with blades oriented in the correct direction (check service manual for your model).
5. Reassemble Water Pump: Install the new plate (19700A2), gaskets (12-858234, 27-822189, 27-19701), key (28-19699), and O-rings (25-62702) in the proper sequence. Torque all fasteners to manufacturer specifications.
6. Replace Thermostat: Locate the thermostat housing on the cylinder head. Remove the old thermostat (8M0117413) and gasket (27-8M0177107), clean the mating surfaces, and install the new components.
7. Change Oil Filter: Remove the old oil filter (35-8M0162829) using a filter wrench. Lubricate the gasket on the new filter with clean engine oil and hand-tighten into place.
8. Replace Fuel Filters: Install the two new fuel filters (35-879884T and 35-8M0153652) per your engine's fuel system layout. Ensure proper orientation and secure all clamps tightly.
9. Lower Unit Service: Drain old gear oil and replace drain gaskets (8M007119, 830749, and additional gaskets 2642, 191833). Refill with fresh gear oil using the included pump (24OP149) until oil appears at the upper vent hole.
10. Reinstall Lower Unit: Align the water tube and shift rod, then slide the lower unit back onto the engine. Install and torque all mounting bolts to specification.
11. Final Checks: Reconnect the fuel line and verify all gaskets and seals are properly seated. Refill engine oil to the correct level and check for leaks.
12. Test Run: Start the engine in a test tank or on-water and verify proper water flow from the telltale. Check for fuel or oil leaks and confirm smooth operation across all RPM ranges.

Troubleshooting & FAQ

How do I confirm this kit fits my Mercury engine?
This kit is designed exclusively for Mercury 40, 50, and 60 HP EFI outboards with standard gear cases. Verify your engine's HP rating, fuel system type (must be EFI), and gear case configuration before ordering. If your model uses a different gear case (e.g., high-performance or counter-rotation), this kit will not fit.

How often should I perform this service?
Mercury recommends a complete service every 100 hours of operation or annually, whichever comes first. If you operate in sandy, silty, or saltwater conditions, inspect the impeller and water pump components every 50 hours and replace as needed.

What are the signs that my impeller or thermostat needs replacement?
A failing impeller typically causes weak or no water flow from the telltale, overheating alarms, or steam from the engine. A faulty thermostat may result in the engine running too cold (poor fuel economy, sluggish performance) or overheating. Replace both components during every annual service to prevent failures.

Can I use this kit if I have a non-EFI (carbureted) Mercury in the same HP range?
No. This kit is specifically engineered for EFI (Electronic Fuel Injection) models with standard gear cases. Carbureted models and EFI engines with different gear case configurations require different part numbers. Always cross-reference your engine's serial number with Mercury's parts catalog.

Why are two fuel filters included?
Mercury EFI systems in this HP range typically use a dual-stage fuel filtration setup: a low-pressure filter (35-879884T) and a high-pressure filter (35-8M0153652). Both filters must be replaced simultaneously to maintain fuel system integrity and prevent injector clogging.

What's the difference between OEM and aftermarket service kits?
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.

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

What is your warranty and return policy?
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.