The Carbon Fiber Big Water Pump Housing Adapter Sleeve from Buckshot Racing #77 is a direct replacement for the Mercury OEM plastic adapter sleeve, part numbers 847685 and 23-847685. This component is engineered for high-performance marine applications for increased strength, thermal stability, and material longevity.
 
Manufactured using aerospace-grade 3K tow carbon fiber tubing, the sleeve is composed of tightly woven filaments—3,000 strands per fiber—to ensure uniform strength and minimal weight. The material is selected for its high modulus, resistance to thermal degradation, and excellent dimensional stability under mechanical stress.
 
The carbon fiber structure provides a significant advantage over injection-molded plastic, particularly in race and offshore environments where operational temperatures and pressures exceed standard thresholds.
 
This adapter sleeve is designed to fit Gen II "Big Tube" Mercury water pump housings and replicates the geometry of the OEM 23-847685 part with high dimensional accuracy. It maintains consistent sealing and alignment characteristics while offering improved resistance to fatigue and environmental wear.
 
The part is compatible with a broad range of Mercury and Mariner high-performance outboards (Sportmasters, Torquemasters, later style CLEs), including but not limited to the 260 ROS, 280 HP, 300 Drag, 225 EFI Pro Max, Super Magnum, 150/200 EFI Pro Max, 2.5L EFI (including Offshore variants), the S3000 Hi-Performance series, and engines used in SST120, S2000, OptiMax 200XS, XR-2 (Europe), and select MerCruiser systems.
 
Developed as part of the Buckshot Racing #77 platform, this carbon fiber sleeve is intended for use in rigorous operating conditions where material performance directly impacts cooling system integrity and overall engine reliability. Its use mitigates deformation risks seen with OEM plastic equivalents and maintains mechanical tolerance under elevated load cycles.
 
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.