Bi-Directional Water Pump for Volvo Penta/MerCruiser Sterndrive 8503991 3853850 140HP impeller replacement is a manageable

impeller replacement is a manageable DIY task

18-5227-1) and AquaPower (A/P3026)

Inspect the housing and insert for wear

Reassemble the pump housing: Replace gaskets with new ones

Brand Model Rated HP Serial Number Range Yamaha Mariner 8A(M) 8HP 655 000000-000300 Yamaha Mariner 8A(ML) 8HP 655 000000-300101 Yamaha Mariner 8B(M) 8HP 677 000101 & Up Yamaha Mariner 8B(ML) 8HP 677 300101 & Up Yamaha Mariner 15A(M) 15HP 651 000285 & Below Yamaha Mariner 15A(ML) 15HP 651 3000100 & Below

Bi-Directional Water Pump for Volvo Penta/MerCruiser Sterndrive 8503991 3853850 140HP impeller replacement is a manageableBi Directional Water Pump Fits MerCruiser V6 V8 Small Block (Replaces 8503991) This engine mounted, bi directional water circulating pump is designed for a wide range of marine engines, including MerCruiser, Volvo Penta, OMC, and other brands using GM small block V6 and V8 engines. It ensures reliable coolant circulation for optimal engine temperature. This component is a direct replacement for MerCruiser part numbers 8503991 and 8M0113734, Volvo