QuickMarine 42040A5 Water Pump Impeller Repair Kit - Reliable Fit

Our review of the QuickMarine 42040A5 Water Pump Impeller Repair Kit finds it tailored for boat owners who need a direct, cost-effective way to restore cooling on small Mercury-compatible outboards. The kit is notable because it includes all the lower unit pump components necessary for a complete impeller service, which makes it especially useful for DIYers and marine technicians servicing 6, 8, 9.9, or 15 HP 2- and 4-stroke engines. The ease of fit and comprehensive parts list are the single biggest reasons to choose this kit when the engine is overheating or the impeller is failing.

Key Features

• Wide compatibility: Fits Mercury Marine 2/4 stroke 6, 8, 9.9 and 15 HP outboard models so customers can replace pumps on several small engines without guessing part numbers.
• Direct replacements: Compatible with Mercury part ranges and replaces Sierra 18-3149 variants, making it straightforward to match to existing pump assemblies.
• Complete service package: Includes impeller, wear plate, gasket, pump base and housing, retainer, oil seal, seal, quad ring, screw and washer so one purchase covers a full rebuild.
• Cross-brand fit: Also fits certain 1998 Force and Sears 9.9 and 15 HP units, expanding usefulness for owners of similar vintage engines.
• Value proposition: Customers report good quality and a perfect fit at a decent price, which makes this kit a practical repair option over buying individual parts.

Who It's For

This kit is best for boat owners, DIY mechanics, and marine service shops working on small outboards that use Mercury-compatible lower unit pump parts. If a 6 to 15 HP engine shows signs of poor cooling, cavitation or overheating, the complete kit allows a full pump rebuild in a single session.

Those who should look elsewhere include people with outboard models outside the stated compatibility or owners who require an OEM-branded part for warranty reasons; likewise, very large or high-performance outboards are beyond this kit's scope.

Pros & Cons

Pros

• Comprehensive parts list lets users replace all critical pump components in one purchase.
• Good fit and functionality for compatible Mercury 6-15 HP engines, restoring engine cooling as reported by customers.
• Replaces several Mercury and Sierra part numbers, simplifying sourcing for common lower unit repairs.

Cons

• Not suitable for outboards outside the specified Mercury/Force/Sears compatibility, so verification is required before purchase.

Specifications

Our Verdict

The QuickMarine 42040A5 kit is a sensible choice for owners of compatible small outboards who want a complete, affordable repair option that restores cooling without multiple orders. It delivers a full set of pump components with good fit and value, making it the recommended option for DIY repairs and routine lower unit maintenance when the engine model matches the listed compatibility.

Frequently Asked Questions

Will this kit fit my 9.9 HP Mercury outboard?
Yes, it is designed to fit Mercury 9.9 HP 2- and 4-stroke lower unit models that use the listed part families.

Does the kit include the impeller and gasket?
Yes, the package includes the impeller, wear plate, gasket and all common pump seals and hardware for a complete rebuild.

Is this an OEM part?
This is a QuickMarine service kit compatible with and replacing several Mercury and Sierra part numbers; it is not labeled as an OEM-branded Mercury kit.