Mercury Water Pump Repair Kit 8M0208905 – Fits Mercury Marine 25-30 HP Outboards (Replaces 853792A07)

Mercury Water Pump Repair Kit 8M0208905 – Fits Mercury Marine 25-30 HP Outboards (Replaces 853792A07)

This complete maintenance service kit is designed for Mercury Marine 25-30 HP, 4-Stroke EFI outboard engines with serial numbers 0R106999 and above. It provides all the necessary components for a comprehensive water pump and periodic service replacement.

This kit is a direct replacement for Mercury part numbers 853792A07 and 8M0208905, as well as Sierra 18-43175 and QuickMarine 8M0208905.

• Includes a complete water pump repair kit, thermostat, fuel filter, oil filter, and drain gaskets.
• Provides a direct replacement for OEM and aftermarket parts, ensuring proper fit and function.
• Specifically designed for Mercury Marine 25–30 HP 4-Stroke EFI outboards (serial 0R106999 and higher).

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.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller Kit (8M0208905, 853792A07)
  • 1 x Impeller (345-65021)
  • 1 x Insert Cup (161572)
  • 1 x Wear Plate (161592)
  • 1 x Key (28-161551)
  • 1 x Gasket (27-161602)
  • 1 x Gasket (27-161582)
  • 4 x Bolt (910103-5652)
• 1 x Thermostat Kit (8M0119207, 8M0214960)
• 1 x Fuel Filter (8M0162831, Sierra 18-7913)
• 1 x Oil Filter (8M0162831, Sierra 18-7913)
• 1 x Cotter Pin (8150264)
• 3 x Drain Gaskets (26-8M0007119, 8M0204693)

Installation Guide

1. Disconnect the battery and shift linkage to ensure safety.
2. Carefully unbolt and remove the lower unit from the outboard engine.
3. Locate the water pump housing on the lower unit and unbolt it.
4. Remove the old impeller, wear plate, insert cup, gaskets, and seals.
5. Thoroughly clean the housing and all mating surfaces of any debris or old gasket material.
6. Install the new gasket and wear plate onto the lower unit.
7. Slide the new impeller onto the driveshaft, rotating it clockwise to seat the vanes correctly.
8. Place the new insert cup into the housing and press the housing down over the impeller.
9. Secure the water pump housing with the provided bolts, tightening them to the manufacturer's specified torque.
10. Reinstall the lower unit onto the outboard, ensuring the shift linkage is correctly reconnected.
11. Reconnect the battery.
12. Once the engine is reassembled, test it in the water to verify proper water circulation from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Mercury outboard?

A: This kit is designed for Mercury Marine 25-30 HP 4-Stroke EFI engines with serial number 0R106999 and above. Please verify your engine's serial number before purchasing. You can use the links provided in the "Compatible Engine Models" section to help locate your serial number.

Q: Is this just a water pump kit or a full service kit?

A: While its primary component is a complete water pump repair kit, it also includes other maintenance items such as a thermostat, fuel filter, oil filter, and drain gaskets, making it a comprehensive service kit.

Q: Why do the fuel filter and oil filter have the same part number?

A: The part number 8M0162831 is listed for both the fuel and oil filter in some supplier data. The filters are distinct components designed for their specific functions but may be bundled a shared component number in this kit.

Q: What are the signs that my water pump needs to be replaced?

A: Common signs of a failing water pump include the engine overheating, a weak or non-existent water stream from the "tell-tale" outlet, or visible damage to the old impeller such as cracked or missing vanes.

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.