Customer Service: info@jlm-marine.com
Free shipping. No Minimum Purchase
Couldn't load pickup availability
Free standard shipping on all orders under 1 KG
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
This water pump impeller repair kit provides the necessary components for servicing the water pump on select Yamaha and Mariner 2-stroke outboards. It is designed to fit Yamaha 25-30 HP models from 1984–1997 (including C25, CV25, C30, CV30) and specific Mariner 20-30 HP models (20C, 25C, 30A) with corresponding serial numbers.
This kit is a direct replacement for Yamaha part numbers 689-W0078-A6-00, 689-W0078-A4-00, and 689-W0078-04-00, as well as several aftermarket equivalents from Sierra Marine, GLM Marine, and Mariner.
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
Brand | Part Number |
---|---|
Yamaha | 689-W0078-A6-00 / 689-W0078-A4-00 / 689-W0078-04-00 |
Sierra Marine | 18-3426 / 18-3427 |
GLM Marine | 12059 / 12058 |
Mariner | 42431M / 84829M / 97793M / 97793T |
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.
Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
---|---|---|---|---|---|---|
Yamaha | 25 HP | 25 | 2-Stroke | 1984-1985 | 689-W0078-A6-00 | |
Yamaha | 25 HP | 25 | 2-Stroke | 1986-1987 | 689-W0078-A6-00 | |
Yamaha | C25 | 25 | 2-Stroke | 1991-1997 | 689-W0078-A6-00 | |
Yamaha | CV25 | 25 | 2-Stroke | 1990 | 689-W0078-A6-00 | |
Yamaha | 30 HP | 30 | 2-Stroke | 1986 | 689-W0078-A6-00 | |
Yamaha | C30 | 30 | 2-Stroke | 1991-1992 | 689-W0078-A6-00 | |
Yamaha | CV30 | 30 | 2-Stroke | 1989-1990 | 689-W0078-A6-00 |
Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
---|---|---|---|---|---|---|
Mariner | 20C | 20 | 2-Stroke | All Years | 42431M | S/N prefix number 6A9 |
Mariner | 25C | 25 | 2-Stroke | All Years | 42431M | S/N prefix number 6A9 |
Mariner | 30A | 30 | 2-Stroke | All Years | 42431M | S/N prefix number 684 |
Specification | Value |
---|---|
Product Type | Water Pump Impeller Repair Kit |
Installation | Direct OEM Replacement |
Other Technical Attributes | Designed for durability with higher flow rates for optimal engine cooling |
A: This kit is designed for specific Yamaha 25-30 HP models (1984-1997) and Mariner 20-30 HP models requiring a 6A9 or 684 serial number prefix. Please carefully review the "Compatible Engine Models" table and cross-reference your engine's model, year, and serial number before purchasing to ensure a correct fit.
Q: What are the signs my water pump impeller needs replacement?A: The most common signs of a failing impeller are engine overheating alarms, a weak or inconsistent water stream from the tell-tale outlet, or a complete lack of water flow. Upon inspection, a worn impeller may have brittle, cracked, or broken vanes.
Q: How often should I replace the water pump impeller?A: As a crucial part of preventative maintenance, we recommend inspecting the impeller annually and replacing the entire water pump kit every 1-2 years or every 100-200 hours of operation. Replacement frequency may vary based on usage (saltwater vs. freshwater) and operating conditions.
Q: Is this a complete kit with the housing included?A: Yes, this is a comprehensive repair kit. It includes the water pump housing, impeller, wear plate, insert cartridge, woodruff key, and all necessary gaskets, seals, and bolts as detailed in the "Package Contents" list.
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.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
Thanks for subscribing!
This email has been registered!