Water Pump Repair Kit – Fits Yamaha F300 F350 (V8) Outboards (Replaces 6AW-W0078-00-00)

Water Pump Repair Kit – Fits Yamaha F300 F350 (V8) Outboards

This water pump repair kit fits genuine Yamaha V8 4-stroke outboard engines, including the F300, LF300, F350, and LF350 models manufactured between 2007 and 2019. It provides all the necessary components to perform a complete water pump service, ensuring optimal cooling system performance.

This kit is a direct replacement for Yamaha OEM part number 6AW-W0078-00-00.

• Complete Service Kit: Includes a new impeller, gaskets, plates, o-rings, and hardware for a full rebuild.
• Direct-Fit Installation: Engineered to match OEM specifications for a straightforward installation without modification.
• Critical Note: This kit requires the separate water pump housing 6AW-44311-01-00 (not included).

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

• 1 x Gasket, Water Pump (6AW-44315-00-00)
• 1 x Insert, Cartridge (6AW-44322-00-00)
• 1 x Outer Plate, Cartridge (6AW-44323-00-00)
• 1 x Key (6AW-44336-00-00)
• 1 x Impeller (6AW-44352-00-00)
• 4 x Bolt, With Washer (90119-08M14-00)
• 1 x O-Ring (93210-37M67-00)
• 1 x O-Ring (93210-94003-00)
• 2 x Pin, Dowel (93606-12019-00)

Important: This kit is designed for use with water pump housing 6AW-44311-01-00, which is sold separately.

Installation Guide

1. Prepare the Lower Unit: Disconnect the battery. Shift the outboard into neutral and remove the lower unit (gearcase) from the engine.
2. Remove Old Pump: Unscrew the bolts securing the water pump housing and carefully lift it off the driveshaft.
3. Dismantle Components: Take note of the order of parts as you remove the old impeller, wear plate, gaskets, and key from the driveshaft.
4. Clean Surfaces: Thoroughly clean the mounting surfaces on the lower unit and inside the housing, removing all old gasket material and corrosion.
5. Install New Parts: Install the new dowel pins, gaskets, and cartridge plate. Slide the new key into the driveshaft keyway.
6. Insert Impeller: Lightly lubricate the new impeller and the inside of the pump housing with marine grease. Slide the impeller onto the driveshaft while turning the shaft clockwise to correctly seat the vanes.
7. Reassemble Housing: Install the new O-rings and place the housing over the impeller. Secure it with the new bolts, tightening them to the torque specified in your service manual.
8. Reinstall Lower Unit: Reattach the lower unit to the outboard motor. Connect the shift shaft and ensure all connections are secure.
9. Test Operation: Once fully assembled, start the engine in the water or with a proper flush attachment and verify a strong, steady stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I know if this kit fits my Yamaha V8 engine?
A: This kit is compatible with Yamaha F300, LF300, F350, and LF350 V8 models from 2007 to 2019. Please verify your exact model and year against the "Compatible Engine Models" table. It directly replaces OEM part number 6AW-W0078-00-00.

Q: Does this kit include the water pump housing?
A: No, this is a repair kit that includes the impeller, gaskets, o-rings, and other internal components shown in the package contents. It requires the separate water pump housing (part number 6AW-44311-01-00).

Q: How often should I replace my water pump impeller?
A: For high-performance engines like the Yamaha V8, it is recommended to inspect the impeller annually and replace it every 100-200 service hours or every two years, whichever comes first, to prevent overheating.

Q: What are the signs of a failing water pump?
A: Common signs include a weak or inconsistent stream from the tell-tale port, an engine overheating alarm, or a noticeable drop in water pressure on your gauges.

Q: OEM vs. 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.

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.