Mercury MerCruiser Quicksilver Water Pump Repair Kit 42089A5
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Mercury MerCruiser / Quicksilver Water Pump Repair Kit – 42089A5
Restore proper cooling performance with the genuine Mercury Marine / Quicksilver 42089A5 Water Pump Repair Kit. This OEM service kit includes the essential components required to rebuild the lower-unit water pump, ensuring reliable raw-water flow through the engine’s cooling system to prevent overheating and maintain optimal engine performance.
Manufactured to Mercury Marine’s original equipment specifications, this kit provides a direct replacement solution for worn water pump components in compatible Mercury and Mariner outboard engines.
Key Features
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Genuine Mercury / Quicksilver OEM water pump repair kit
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Restores cooling water circulation through the outboard engine
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Helps prevent engine overheating and cooling system failure
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Includes critical pump service components for a complete repair
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Designed for reliable performance in harsh marine environments
Kit Includes
Typical kit components include:
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Water pump impeller
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Pump housing
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Wear plate
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Gaskets and O-rings
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Key and installation hardware
(Exact contents may vary slightly depending on production revision.)
Replaces / Cross Reference
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Mercury 46-42089A5
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Sierra 18-3320 aftermarket equivalent
Compatible Mercury / Mariner Engines
Commonly used on Mercury and Mariner outboard engines, including:
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75 HP outboards
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80 HP outboards
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90 HP outboards
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100 HP outboards
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115 HP outboards
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125 HP outboards
Typically used on inline 4-cylinder 2-stroke Mercury / Mariner outboards, depending on serial number range.
Service Recommendation
Water pump components are wear items and should typically be inspected annually and serviced every 100 hours or once per season to maintain reliable engine cooling.
Important Compatibility Note
Water pump kits may vary by engine model, gearcase type, and serial number range. Always verify compatibility using the engine serial number before ordering to ensure the correct repair kit.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.