Water Pump Rebuild Kit – Fits Mercury 3.0L DFI Outboards (Replaces 817275A5)

Water Pump Rebuild Kit – Fits Mercury 3.0L DFI Outboards (Replaces 817275A5)

This complete water pump rebuild kit is designed for Mercury 200-300 HP outboards with 3.0L DFI/EFI engines (1998-2012), including ProMax, Seapro, Marathon, and Sport XS models. It is also compatible with select Mercury Alpha One Gen 2 stern drives. Engineered for a direct fit, it ensures reliable engine cooling performance.

This kit serves as a direct replacement for Mercury OEM part number 817275A5 and other equivalent aftermarket parts.

• Installation Method: Direct OEM replacement.
• Key Component: Includes a durable neoprene rubber impeller for excellent saltwater resistance.
• Complete Kit: Contains all necessary gaskets, seals, and o-rings for a full 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. 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.

Mercury/Mariner Outboards (3.0L Engines)

MerCruiser Stern Drives

Technical Specifications

Package Contents

• 1 x Impeller (47-43026T2/47-43026-2/43026Q02)
• 1 x Impeller Plate (8172761)
• 1 x Face Seal with Tool (26-816575A2)
• 1 x Impeller Key (28-43037)
• 1 x Carrier Seal (821759A4)
• 2 x O-Rings (25-21836)
• 1 x Seal Ring Gasket (26-45577B1)
• 1 x Drain Screw Gasket (12-191833)
• 2 x Impeller Gaskets (27-430331, 27-8172771)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is in a secure, stable position.
2. Access the Lower Unit: Drain the gearcase oil. Remove the bolts securing the lower unit (gearcase) to the engine's midsection and carefully lower it.
3. Remove the Old Pump: Locate the water pump housing on top of the gearcase. Unbolt and remove the housing to expose the impeller.
4. Inspect and Clean: Take out the old impeller, key, and gaskets. Thoroughly clean all mating surfaces, removing any old gasket material or debris.
5. Install New Components: Place the new gaskets and wear plate. Insert the new impeller key into the driveshaft and slide the new impeller on, turning the shaft clockwise to bed the vanes.
6. Reassemble: Install the new seals, O-rings, and housing. Ensure all bolts are torqued to manufacturer specifications.
7. Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure with bolts.
8. Final Checks: Refill the gearcase with fresh oil. Reconnect the battery and test the engine using a water supply (flushing muffs) to confirm proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
The most reliable method is to match your engine's serial number to the ranges listed in the "Compatible Engine Models" table above. Cross-referencing the OEM part number (817275A5) with your service manual or an existing part is also a great way to verify fitment.

What are the signs my water pump needs to be replaced?
Common symptoms include a weak or no water stream from the "tell-tale" outlet, engine overheating alarms, and visible cracking or damage to the impeller vanes during a visual inspection. Regular replacement every 1-2 seasons is recommended for preventative maintenance.

Is this a complete kit?
Yes, this is a comprehensive rebuild kit that includes the impeller, wear plates, housing, gaskets, seals, and o-rings necessary for a standard water pump service. Please refer to the "Package Contents" list for a detailed breakdown of all included parts.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.