8M0113483 Maintenance Service Kit for Mercury 40HP 50HP 60HP EFI 4Cyl | JLM Marine

8M0113483 Maintenance Service Kit for Mercury 40HP 50HP 60HP EFI 4Cyl

This comprehensive maintenance service kit is specifically designed for Mercury 40HP, 50HP, and 60HP EFI 4-Cylinder 4-Stroke outboard motors with standard gear cases. It includes all essential components needed for regular maintenance—water pump repair kit, thermostat, fuel filters, oil filter, and drain gaskets—ensuring your engine runs smoothly and reliably.

This kit directly replaces Mercury OEM part number 8M0113483 and aftermarket equivalent 47-19453T, providing a complete solution for routine servicing of your Mercury outboard.

• Complete maintenance package with 7 essential components plus gaskets
• Includes both low-pressure and high-pressure fuel filters for comprehensive fuel system maintenance
• Water pump repair kit with impeller, gaskets, wear plate, and key for complete pump servicing

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 Water Pump Repair Kit (47-19453Q2, 46-812966A12/11)
  • 1 x Impeller 47-19453T
  • 1 x Upper Gasket 27-822189
  • 1 x Wear Plate 19700A2
  • 1 x Lower Gasket 27-8M4502052
  • 1 x Impeller Key 28-8M0032831
• 1 x Thermostat (8M0168892/8M0117413)
• 1 x Thermostat Gasket (27-887978 & 27-8M0177107)
• 1 x Fuel Filter Assembly (low pressure) 35-879884T
• 1 x Fuel Filter (high pressure) 35-8M0153652
• 1 x Oil Filter 35-8M0162829
• 1+3 Drain Gaskets (26-8M0007119 & 26-8M0204693)

Installation Guide

1. Ensure the engine is cool and disconnect the battery before beginning any maintenance work. Gather all necessary tools including wrenches, screwdrivers, and a clean workspace.
2. Remove the lower unit/gear case to access the water pump assembly. Clean the area thoroughly before disassembly.
3. Disassemble the old water pump, removing the impeller, wear plate, and gaskets. Inspect the housing for damage or excessive wear.
4. Install the new wear plate into the pump housing, ensuring proper alignment. Apply a light coating of marine grease to the new impeller before installation.
5. Insert the impeller key into the driveshaft slot, then carefully install the new impeller with blades facing the correct rotation direction. Install the upper and lower gaskets per factory specifications.
6. Locate and remove the old thermostat housing cover. Remove the old thermostat and clean the mating surfaces thoroughly.
7. Install the new thermostat with the correct orientation (temperature element facing the correct direction). Place the new thermostat gasket and secure the housing cover with proper torque.
8. Locate the oil filter on the engine block and remove the old filter using an oil filter wrench. Clean the mounting surface and apply a light film of clean oil to the new filter gasket.
9. Install the new oil filter by hand, tightening it snugly but not over-torquing. Replace the drain plug gasket when performing oil changes.
10. Locate both the low-pressure and high-pressure fuel filters in the fuel system. Relieve fuel system pressure before disconnecting fuel lines.
11. Replace both fuel filters, ensuring proper fuel line connections and clamp tightness. Check for leaks after installation.
12. Reassemble the lower unit, refill with appropriate gear oil using new drain gaskets, reconnect the battery, and perform a thorough system check before operation.

Troubleshooting & FAQ

Q: How do I confirm this maintenance kit fits my Mercury outboard?
A: This kit is designed specifically for Mercury 40HP, 50HP, and 60HP EFI 4-Cylinder 4-Stroke outboards with standard gear cases only. Verify your engine model and serial number using the Mercury Serial Number Guide linked above, and cross-reference the OEM part number 8M0113483 with your engine's service manual to ensure compatibility.

Q: How often should I perform maintenance with this kit?
A: Mercury recommends annual maintenance or every 100 hours of operation, whichever comes first. The water pump impeller should be inspected yearly and replaced if worn, while fuel filters and oil filters should be changed according to your engine's maintenance schedule—typically annually or every 100 hours.

Q: What are the signs that my water pump or filters need replacement?
A: Common signs include reduced water flow from the tell-tale (indicating impeller failure), engine overheating, loss of power, rough idling, or difficulty starting. If you notice any of these symptoms, inspect and replace the water pump impeller and filters immediately to prevent engine damage.

Q: Can I install this maintenance kit myself or do I need a professional?
A: If you have mechanical experience and the proper tools, you can install these components yourself by following the service manual. However, if you're unfamiliar with outboard maintenance procedures—especially fuel system work and lower unit removal—professional installation is strongly recommended to ensure safety and proper function.

Q: What's the difference between this aftermarket kit and the OEM Mercury kit?
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.