3GR-87500-1 Maintenance Kit for Tohatsu MFS4 MFS5 MFS6D | JLM Marine

3GR-87500-1 Maintenance Kit for Tohatsu MFS4 MFS5 MFS6D | JLM Marine

This comprehensive maintenance kit is designed specifically for Tohatsu MFS4, MFS5, and MFS6D outboard engines. It includes all essential components needed for routine servicing, ensuring your engine continues to deliver reliable performance on the water.

This kit directly replaces OEM part number 3GR-87500-1, providing a complete service solution in one convenient package. Designed to meet OEM specifications, this aftermarket maintenance kit offers quality and value for professional mechanics and DIY boat owners alike.

• Complete maintenance solution with water pump repair kit, thermostat, filters, and gaskets
• Fits Tohatsu MFS4, MFS5, and MFS6D outboard models
• All critical service components included for comprehensive engine 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.

Technical Specifications

Package Contents

This maintenance kit includes the following components:

• 3AB-87322-0 Water Pump Repair Kit x1
• 3H6-01030-0 Thermostat x1
• 346-01032-0 Thermostat Gasket x1
• 369-02230-0 Fuel Filter x1
• 332-60006 Drain Gasket x2
• 24OP149 Gear Oil Pump x1

Installation Guide

1. Preparation: Ensure the engine is off and cool. Gather all necessary tools including screwdrivers, wrenches, and a drain pan.
2. Drain Gear Oil: Remove the lower unit drain plug using one of the included drain gaskets. Allow all gear oil to drain completely into a suitable container.
3. Replace Fuel Filter: Locate the fuel filter in the fuel line. Disconnect the fuel line, remove the old filter, and install the new 369-02230-0 fuel filter with proper orientation.
4. Remove Water Pump Housing: Access the water pump by removing the lower unit. Carefully separate the pump housing to expose the impeller and components.
5. Install Water Pump Repair Kit: Replace all water pump components using the 3AB-87322-0 repair kit, including impeller, gaskets, and seals. Lubricate the impeller with glycerin or soapy water before installation.
6. Replace Thermostat: Remove the thermostat cover and old thermostat. Install the new 3H6-01030-0 thermostat with the 346-01032-0 gasket, ensuring proper orientation.
7. Reassemble Lower Unit: Reinstall the water pump housing and lower unit, torquing all fasteners to manufacturer specifications.
8. Refill Gear Oil: Using the included 24OP149 gear oil pump, refill the lower unit with the appropriate gear oil until it flows from the upper vent hole. Install drain plugs with new 332-60006 gaskets.
9. Reconnect Fuel System: Ensure all fuel line connections are secure and leak-free. Check that the fuel filter is properly seated.
10. Test Run: Start the engine and check for proper water flow from the cooling system. Inspect all service points for leaks and verify normal operating temperature.

Troubleshooting & FAQ

Q: How do I know if this maintenance kit fits my Tohatsu engine?
A: This kit is designed specifically for Tohatsu MFS4, MFS5, and MFS6D models. Verify your engine model number on the identification plate, and cross-reference the OEM part number 3GR-87500-1 with your service manual to ensure compatibility.

Q: How often should I perform this maintenance service?
A: Tohatsu recommends annual maintenance or every 100 operating hours, whichever comes first. If you operate in saltwater, sandy conditions, or frequently run at high RPMs, consider more frequent service intervals.

Q: Can I install this kit myself, or do I need a professional?
A: While experienced DIY mechanics can complete this service with proper tools and procedures, professional installation is recommended if you're unfamiliar with outboard maintenance. Incorrect installation of the water pump or thermostat can lead to engine overheating.

Q: What are signs that my engine needs this maintenance service?
A: Common indicators include weak water pump discharge, engine overheating, reduced cooling system flow, difficulty starting when warm, or if you've reached the recommended service interval. Don't wait for failure—preventive maintenance is key.

Q: Is this an OEM kit or aftermarket?
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.

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.