Restore proper cooling system performance and protect your engine against high-temperature wear with this complete water pump repair kit. Designed specifically for heavy-duty marine applications, this kit replaces worn impellers, fatigued face seals, and compromised gaskets to maintain maximum water pressure and volume across all operating RPMs.
Fitment
Fits select 1998 to 2018 Mercury and Mariner 40 HP, 50 HP, and 60 HP 4-stroke outboard models equipped with the larger 4.25" BigFoot or Command Thrust gearcase, including:
- 40 HP 4-Stroke BigFoot / Command Thrust: 3-Cylinder & 4-Cylinder EFI and Carbureted models (1998–2018)
- 50 HP 4-Stroke BigFoot / Command Thrust: 4-Cylinder EFI and Carbureted models (1998–2018)
- 60 HP 4-Stroke BigFoot / Command Thrust: 4-Cylinder EFI models (2001–2018)
Note: Fits models with the larger 4.25" gearcase. Does not fit standard 3.25" gearcase models. Water pump housing is not included.
What’s Included
- Neoprene water pump impeller
- Stainless steel wear plate
- Impeller drive key
- Water pump gaskets and face seals
- O-rings and water tube grommets
Replaces / Cross-References
- Mercury / Quicksilver OEM: 817275A4, 817275A 4, 817275T4, 817275Q05
- Sierra Marine: 18-3320
- GLM: 12411
- Mallory Marine: 9-48315
Fitment Caution
Fitment can vary by engine serial number, gearcase size (BigFoot/Command Thrust 4.25" vs. Standard 3.25"), and horsepower. Compare your original pump components and OEM cross-reference numbers prior to ordering.
Questions About This Product?
Have a question about this part or need help determining if it may work for your application? Email us at customerservice@marinepartswarehouse.com with your engine model and serial number, and our team will be happy to help with any information we have available.
