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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 comprehensive water pump repair kit is designed for Mercury and Mariner 2-cycle outboards from 30 HP through 70 HP, manufactured between 1977 and 1997. It provides all necessary components for a complete and reliable water pump service.
This kit is a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility for the specified engine models.
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
Brand | Part Number |
---|---|
Mercury | 46-77177A3 |
Mercury | 77177A3 |
Sierra | 18-3324 |
GLM | 12100 |
Mallory | 9-48312 |
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
---|---|---|---|---|---|---|
Mercury/Mariner | Jet | 30 | 2-Stroke | 1989-1997 | 77177A3 | 4 cylinders (USA 0C159200-0G589999) |
Mercury/Mariner | Standard | 35 | 2-Stroke | 1984-1989 | 77177A3 | 2 cylinders |
Mercury/Mariner | Standard | 40 | 2-Stroke | 1978-1983 | 77177A3 | 2 cylinders (USA 4860103 & below, BEL 9184451 & below) |
Mercury/Mariner | Standard | 40 | 2-Stroke | 1989-Up | 77177A3 | 4 cylinders |
Mercury/Mariner | Standard | 45 | 2-Stroke | 1986-Up | 77177A3 | 4 cylinders |
Mercury/Mariner | Standard | 50 | 2-Stroke | 1978-1985 | 77177A3 | 4 cylinders (USA 5531630 & above) |
Mercury/Mariner | Standard | 50 | 2-Stroke | 1984-1990 | 77177A3 | 3 cylinders (USA 6428681-0D000749) |
Mercury/Mariner | Standard | 60 | 2-Stroke | 1984-1990 | 77177A3 | 3 cylinders |
Mercury/Mariner | Standard | 65 | 2-Stroke | 1976 | 77177A3 | 3 cylinders |
Mercury/Mariner | Standard | 70 | 2-Stroke | 1977-1983 | 77177A3 | 3 cylinders (USA 4977157-6428680) |
Specification | Value |
---|---|
Product Type | Water Pump Repair Kit |
Installation | Requires lower unit removal |
Housing Material | Plastic and metal |
Dimensions | 108mm × 102mm × 95mm (4.25" × 4.00" × 3.75") |
Weight | 0.34 kg (0.75 lb) |
Warranty | 1 year (varies by manufacturer) |
Q: How do I confirm this kit fits my specific engine model?
A: The most reliable method is to match your engine's serial number to the ranges listed in our "Compatible Engine Models" table. For Mercury/Mariner owners, use the linked serial number guide to find your number and confirm it falls within the specified range (e.g., "USA 0C159200-0G589999"). Cross-referencing the OEM part number (77177A3) is also a highly effective verification method.
Q: What are the common signs of a failing water pump?
A: The most common indicators include the engine overheating at idle or low speeds, and a weak or non-existent water stream from the "tell-tale" outlet port. A brittle or cracked impeller can no longer pump water effectively, leading to poor engine cooling.
Q: How often should the water pump impeller be replaced?
A: For preventative maintenance, it is recommended to replace your water pump impeller and gaskets annually or every 100 hours of operation, whichever comes first. This is especially important for boats used in saltwater, as salt can accelerate the degradation of rubber components.
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.
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