6J8-W006A-00 Maintenance Kit for Yamaha 30HP 2-Stroke 3-Cylinder | JLM Marine

6J8-W006A-00 Maintenance Kit for Yamaha 30HP 2-Stroke 3-Cylinder | JLM Marine

This comprehensive maintenance kit is engineered for Yamaha 30HP 2-Stroke 3-Cylinder outboard engines manufactured between 1990 and 2016. It provides all essential components needed for routine service intervals, including water pump parts, thermostats, fuel filtration, and drain gaskets.

Designed as a direct replacement for OEM part number 6J8-W006A-00, this kit ensures your engine maintains optimal cooling, fuel delivery, and lubrication performance. Each component meets or exceeds original specifications for reliable operation.

• Complete service package with impeller, gaskets, thermostat, fuel filter, and gear oil pump
• Covers all critical maintenance components in one convenient kit
• Fits Yamaha 30HP 2-Stroke 3-Cylinder models from 1990 to 2016

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 Yamaha owners, here's a guide to help you identify your engine's serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This maintenance kit includes the following components:

• 663-44322-00 - Cup, Insert × 1
• 90280-03024 - Key × 1
• 6H4-44352-02 - Impeller × 1
• 663-44315-A0 - Gasket × 1
• 663-44323-00 - Plate, Wear × 1
• 663-44324-A0 - Gasket × 1
• 663-44316-A0 - Gasket × 1
• 90119-08M13 - Bolt × 2
• 90119-08M34 - Bolt × 2
• 61N-24560-00 - Fuel Filter × 1
• 6E5-12411-30 - Thermostat × 1
• 6J8-12414-A0 - Thermostat Gasket × 1
• 90430-08020 - Drain Gasket × 4
• 91490-30025 - Cotter Pin × 1
• 24OP149 - Gear Oil Pump × 1

Installation Guide

1. Disconnect the engine and allow it to cool completely before beginning any maintenance work. Gather all necessary tools including screwdrivers, wrenches, and a clean workspace.
2. Remove the lower unit according to your engine's service manual to access the water pump housing. Carefully detach the water pump cover and set aside the old gaskets and components.
3. Clean the water pump housing thoroughly, removing any debris, old gasket material, or corrosion. Inspect the housing for cracks or damage that may require additional repair.
4. Install the new wear plate (663-44323-00) into the housing, ensuring proper orientation. Place the new gasket (663-44315-A0) on top of the wear plate.
5. Insert the new impeller (6H4-44352-02) into the housing, rotating the blades in the correct direction of engine rotation. Install the key (90280-03024) and insert cup (663-44322-00) as specified.
6. Apply the new gaskets (663-44324-A0 and 663-44316-A0) to the pump cover, then secure the cover using the provided bolts (90119-08M13 and 90119-08M34). Torque bolts to manufacturer specifications in a cross pattern.
7. Replace all four drain gaskets (90430-08020) at their respective locations on the lower unit. Ensure each gasket seats properly to prevent oil leaks.
8. Remove the old thermostat housing and install the new thermostat (6E5-12411-30) with the new thermostat gasket (6J8-12414-A0). Secure the housing and verify proper seating.
9. Replace the fuel filter (61N-24560-00) by disconnecting fuel lines, removing the old filter, and installing the new one with proper orientation. Reconnect fuel lines securely.
10. Install the cotter pin (91490-30025) at the designated location as shown in your service manual. Use the included gear oil pump (24OP149) to refill the lower unit with fresh gear oil to the proper level.
11. Reinstall the lower unit onto the engine, ensuring all mounting bolts are torqued to specification. Double-check all connections, gaskets, and fasteners.
12. Start the engine and check for proper water flow from the telltale indicator, verifying the water pump is functioning correctly. Inspect all work areas for leaks and proper operation.

Troubleshooting & FAQ

Q: How do I confirm this maintenance kit fits my Yamaha outboard?
A: Verify that your engine is a Yamaha 30HP 2-Stroke 3-Cylinder model manufactured between 1990 and 2016. Cross-reference your original part number (6J8-W006A-00) with the kit, and use the Yamaha Serial Number Guide linked above to confirm your engine specifications.

Q: How often should I perform maintenance using this kit?
A: Yamaha recommends water pump service every 100 hours of operation or annually, whichever comes first. The thermostat and fuel filter should be inspected during each service and replaced if showing signs of wear, corrosion, or reduced performance.

Q: What are the signs that my water pump impeller needs replacement?
A: Common symptoms include weak water flow from the telltale, engine overheating, steam from the engine, or reduced cooling efficiency. If your impeller shows cracked blades, missing pieces, or has become hard and brittle, immediate replacement is necessary.

Q: Can I install this kit myself or do I need a marine mechanic?
A: While experienced DIY mechanics can perform this maintenance with proper tools and a service manual, professional installation is recommended. Incorrect installation can lead to engine overheating, fuel system issues, or lower unit damage.

Q: What's the difference between this aftermarket kit and the OEM version?
A: This aftermarket kit is manufactured to meet or exceed OEM specifications using comparable-grade materials. All components are produced in ISO9002-certified facilities and undergo rigorous quality inspections to ensure reliable performance at a more competitive price point than OEM alternatives.

Q: Is this an OEM part or an aftermarket replacement?
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.