Dayco DP9951 Engine Water Pump

Dayco DP9951 Engine Water Pump

The Dayco DP9951 engine water pump is a heavy-duty replacement for older GM and Buick, Cadillac, Oldsmobile, and Pontiac applications using a V-belt drive. It is built for direct-fit service on a wide range of classic cars and trucks, including Chevrolet Caprice, Oldsmobile Cutlass, and Pontiac Grand Prix applications.

Key Features

• Engine water pump for cooling system service
• Heavy-duty construction for V-belt driven applications
• Compatible with a broad range of 1971-1990 GM vehicles
• Fits select models with air conditioning and heavy-duty options
• Dayco part number DP9951 for easy identification

Fitment Highlights

• Fits 1981-1990 Buick LeSabre, N/A; Heavy Duty; V-Belt Driven
• Fits 1987-1990 Cadillac Brougham, N/A; Heavy Duty; V-Belt Driven
• Fits 1986-1990 Chevrolet Caprice, N/A; Heavy Duty; V-Belt Driven
• Fits 1971-1990 Oldsmobile Custom Cruiser, N/A; Heavy Duty; V-Belt Driven
• Fits 1987-1989 Pontiac Safari, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1971-1988 Oldsmobile Cutlass Supreme, N/A; Heavy Duty; V-Belt Driven
• Fits 1985-1987 Buick Regal, N/A; Heavy Duty; V-Belt Driven
• Fits 1979-1986 Cadillac Fleetwood, N/A; Heavy Duty; V-Belt Driven
• Fits 1976-1986 Pontiac Parisienne, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1980-1985 Buick Riviera, N/A; Heavy Duty; V-Belt Driven
• Fits 1979-1985 Cadillac Eldorado, N/A; Heavy Duty; V-Belt Driven
• Fits 1976-1985 Cadillac Seville, N/A; Heavy Duty; V-Belt Driven
• Fits 1971-1985 Oldsmobile Delta 88, N/A; Heavy Duty; V-Belt Driven
• Fits 1971-1985 Oldsmobile Toronado, N/A; Heavy Duty; V-Belt Driven
• Fits 1979-1984 Cadillac DeVille, N/A; Heavy Duty; V-Belt Driven
• Fits 1983-1984 Chevrolet El Camino, N/A; Heavy Duty; V-Belt Driven
• Fits 1980-1984 Chevrolet Impala, N/A; Heavy Duty; V-Belt Driven
• Fits 1982-1984 Chevrolet Monte Carlo, N/A; Heavy Duty; V-Belt Driven
• Fits 1971-1984 Oldsmobile 98, N/A; Heavy Duty; V-Belt Driven
• Fits 1977-1984 Pontiac Bonneville, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1981-1984 Pontiac Grand Prix, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1982-1983 Chevrolet Malibu, N/A; Heavy Duty; V-Belt Driven
• Fits 1980-1983 Oldsmobile Cutlass Cruiser, N/A; Heavy Duty; V-Belt Driven
• Fits 1982-1983 Pontiac Grand LeMans, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1978-1981 Chevrolet C10, N/A; Heavy Duty; V-Belt Driven
• Fits 1979-1981 GMC C1500, N/A; Heavy Duty; V-Belt Driven
• Fits 1979-1981 GMC C1500 Suburban, N/A; Heavy Duty; V-Belt Driven
• Fits 1971-1981 Oldsmobile Cutlass, N/A; Heavy Duty; V-Belt Driven
• Fits 1977-1981 Pontiac Catalina, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1976-1981 Pontiac Laurentian, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1978-1980 Chevrolet C10 Suburban, N/A; Heavy Duty; V-Belt Driven
• Fits 1977-1979 Pontiac Firebird, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1978 Chevrolet C30, N/A; Heavy Duty; V-Belt Driven
• Fits 1975-1977 Buick Skylark, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1973-1977 Oldsmobile Omega, N/A; Heavy Duty; V-Belt Driven
• Fits 1976-1977 Pontiac LeMans, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1977 Pontiac Phoenix, N/A; Heavy Duty; V-Belt Driven; w/A.C.
• Fits 1974 Oldsmobile Delta 88, N/A; Heavy Duty; Heavy Duty Option; V-Belt Driven

What This Water Pump Helps Address

• Coolant circulation problems caused by a worn water pump
• Overheating concerns in V-belt driven cooling systems
• Leakage from an aging engine water pump
• Noisy or rough pump operation in high-mileage vehicles
• Cooling system service on classic Buick, Chevrolet, Cadillac, Oldsmobile, and Pontiac models

Installation Notes

Verify engine configuration, accessory drive type, and any air conditioning or heavy-duty notes before ordering. This Dayco DP9951 water pump is listed for V-belt driven applications only, and some fitments include specific mounting-surface or A/C-related requirements. Confirm the vehicle’s original cooling system layout against the fitment notes for an accurate match.

Quality Assurance

Dayco DP9951 is cataloged as an engine water pump for direct replacement use in supported applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.