3NV-87500-0 Service Kit for Tohatsu MFS25C MFS30C MFS25D MFS30D | JLM Marine

Service Kit for Tohatsu MFS25C, MFS30C, MFS25D, MFS30D Outboard Engines

This comprehensive service kit is engineered for Tohatsu MFS25C, MFS30C, MFS25D, and MFS30D outboard engines, delivering all the essential components needed for a complete routine maintenance overhaul. Whether you're performing seasonal servicing or addressing wear on critical cooling and filtration systems, this kit ensures your engine runs at peak performance.

This kit directly replaces OEM part number 3NV-87500-0, providing an aftermarket solution that meets OEM specifications. It includes water pump components, thermostats, filters, gaskets, and hardware—everything required for a thorough service in one convenient package.

• Includes complete water pump rebuild components (impeller, gaskets, insert cup, plate, key, and hardware)
• Features dual thermostat assemblies with gaskets for comprehensive cooling system maintenance
• Contains fuel filter, oil filter, drain gaskets, and gear oil pump for full fluid system service

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 service kit includes the following components:

• 161572 (Insert Cup) × 1
• 47-16154-1 (Impeller) × 1
• 27-161602 (Gasket) × 1
• 161592 (Plate) × 1
• 27-161582 (Gasket) × 1
• 28-161551 (Key) × 1
• 910103-5652 (Screw) × 4
• 8M0119207 (Thermostat) × 1
• 27-853702005 (Thermostat Gasket) × 1
• 35-8M0088825 (Fuel Filter) × 1
• 35-8M0162831 (Oil Filter) × 1
• 8M007119 (Drain Gasket) × 1
• 8M02046936 (Drain Gasket) × 2
• 12-895146 (Gasket) × 1
• 8150264 (Cotter Pin) × 1
• 24OP149 (Gear Oil Pump) × 1
• 3R3-01030-0 (Thermostat) × 1
• 346-01032-0 (Thermostat Gasket) × 1
• 3AD-02230-0 (Fuel Filter) × 1
• 3BJ-07615-0 (Oil Filter) × 1
• 2049 (Drain Gasket) × 1
• 2492 (Drain Gasket) × 2
• 3R3-07406-0 (Gasket) × 1
• 951503-0322 (Cotter Pin) × 1

Note: This kit contains duplicate components with different part numbers to ensure compatibility across MFS25/30C and MFS25/30D engine variants. Verify which components apply to your specific model before installation.

Installation Guide

1. Preparation: Gather all necessary tools including screwdrivers, wrenches, and a service manual for your specific Tohatsu model. Ensure the engine is off and cool before beginning work.
2. Water Pump Disassembly: Remove the lower unit and locate the water pump housing. Carefully remove the screws securing the housing cover using the appropriate size driver.
3. Remove Old Components: Extract the old impeller, gaskets, insert cup, and plate. Inspect the housing for debris, corrosion, or scoring that may affect seal integrity.
4. Install Insert Cup and Plate: Place the new insert cup (161572) and plate (161592) into the housing, ensuring proper orientation per your service manual.
5. Install Impeller: Lubricate the new impeller (47-16154-1) with water pump grease and carefully insert it, bending the vanes in the direction of rotation. Install the key (28-161551) in its slot.
6. Install Gaskets and Reassemble: Position the new gaskets (27-161602, 27-161582) and secure the water pump housing with the provided screws (910103-5652). Torque to specification.
7. Replace Thermostats: Locate the thermostat housings and remove the old thermostats. Install the new thermostats (8M0119207, 3R3-01030-0) with fresh gaskets (27-853702005, 346-01032-0).
8. Replace Fuel Filter: Disconnect the fuel line and remove the old fuel filter. Install the new fuel filter (35-8M0088825 or 3AD-02230-0) ensuring proper flow direction.
9. Replace Oil Filter: Drain the engine oil and remove the old oil filter. Install the new oil filter (35-8M0162831 or 3BJ-07615-0) with a light coating of fresh oil on the gasket.
10. Replace Drain Gaskets: When draining gear oil, replace all drain plug gaskets (8M007119, 8M02046936, 2049, 2492) to prevent leaks.
11. Refill Fluids: Use the included gear oil pump (24OP149) to refill the lower unit with the manufacturer-recommended gear oil. Refill engine oil to the proper level and reconnect fuel lines.
12. Final Inspection: Reinstall the lower unit, install the cotter pins (8150264, 951503-0322) where required, and perform a thorough visual inspection. Start the engine and check for proper water flow, leaks, and normal operating temperature.

Troubleshooting & FAQ

Q: How do I confirm this service kit fits my Tohatsu engine?
A: Verify that your engine model is MFS25C, MFS30C, MFS25D, or MFS30D. Cross-reference the OEM part number 3NV-87500-0 with your engine's service manual or parts diagram to ensure compatibility.

Q: How often should I perform this service and replace these components?
A: Tohatsu recommends servicing the water pump impeller annually or every 100 operating hours, whichever comes first. Filters and thermostats should be inspected annually and replaced as needed, typically every 1–2 years depending on usage conditions.

Q: What are the signs that my water pump or thermostat needs replacement?
A: Common symptoms include engine overheating, weak or no water discharge from the telltale, steam from the engine, or inconsistent operating temperatures. If you observe any of these signs, inspect and replace the water pump and thermostat immediately.

Q: Why does this kit include duplicate components with different part numbers?
A: The MFS25/30C and MFS25/30D models use slightly different components for certain items like thermostats, filters, and gaskets. This kit includes both variants to ensure complete coverage; use the components that match your specific engine model as shown in your service manual.

Q: Can I install this service kit myself or do I need a professional?
A: If you have mechanical experience and the proper tools, you can perform this service following the installation guide and your engine's service manual. However, professional installation is recommended if you are unfamiliar with outboard maintenance to ensure safety and proper function.

Q: Is this an OEM or aftermarket service 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.