The Water Pump Housing Kit for Mercury and Mariner Outboards from Buckshot Racing #77 replaces the OEM 817275A1 and 817275A2 and provides a water pump rebuild solution to service most all  V6 two-stroke outboards built from 1976 to 2005.
 
It includes the small tube housing, impeller, guide tube, driveshaft key, slinger, and multiple gaskets and o-rings, making it suitable for the 2.0L, 2.4L, and 2.5L engine families. These engines power models such as the 135 HP, 150 Black Max, XR2, XR4, XR6, 175 HP, 200 HP, and the XRI EFI. The kit also supports sterndrive units, including the R, MR, and Alpha I series.
 
Compatibility Across Models and Years
Designed to fit a wide range of horsepower ratings and performance categories, this kit covers both fishing and racing applications. From the versatile 135 HP and 150 HP configurations to the 175 HP and 200 HP motors, the housing kit ensures reliable cooling performance.
 
It also extends to owners of sterndrive-powered boats, including Alpha I and MR drives, who benefit from the same comprehensive coverage.
 
Part Number Cross-Reference
To ensure an accurate fit, this housing kit corresponds with multiple Mercury part numbers. Compatible references include 12280, 18-3517, 32437A1, 32437A3, 37433A1, 42579A4, 44292A4, 48747A3, 57234A3, 58618A4, 60367A1, 60367A4, 64141A11, 69222A3, 73802A3, 73804A3, 78400A2, 9-48311, 96148A5, 96148A8, 9614885, and 9614888. These part numbers span decades of Mercury outboard and sterndrive production, ensuring coverage for both standard and performance-oriented V6 platforms.
 
Installation and Technical Considerations
Servicing begins by removing the lower unit to expose the pump assembly. The old impeller, housing, and seals are replaced with the new components from the kit. The guide tube and small tube housing are positioned to align water intake passages, while the impeller is seated on the driveshaft.
 
Proper orientation, lubrication, and gasket placement are essential for leak-free performance. During reassembly, careful alignment of the water tube and correct torque settings prevents cooling issues. For higher-output models like the 200 HP EFI ensuring correct installation is especially important to avoid overheating under load.
 
Why Proper Maintenance Matters
Mercury V6 two-stroke engines depend on steady water flow to protect against overheating. Engines ranging from the 135 HP and 150 HP Black Max to the 175 HP, 200 HP are particularly vulnerable to cooling failures if the water pump is neglected.
 
Replacing the housing, impeller, and seals with this kit at routine intervals preserves reliability, prevents powerhead damage, and ensures consistent performance across fishing, cruising, and racing applications.
 
The Mercury V6 water pump housing kit provides complete service coverage for two-stroke outboards and sterndrives built between 1976 and 2005. Supporting engines like the 135 HP, 150 Black Max, 175 HP, 200 HP, XR6, and XRI EFI, it offers compatibility with a wide array of part numbers, including 12280, 18-3517, and 96148A8. With its included housing, impeller, guide tube, and sealing components, the kit ensures reliable cooling performance across Mercury’s most enduring V6 designs.
 
Includes one (1) Water Pump Kit for Mercury Motors
 
Contact Mike Hill with any tech questions at +1-714-697-1716 or mike@buckshotracing77.com