Dayco DP991 Engine Water Pump

Dayco DP991 Engine Water Pump

The Dayco DP991 engine water pump is a direct-fit cooling system replacement for a wide range of classic Ford, Mercury, and Lincoln applications. It is built for vehicles that use a 2-bypass-tube, standard-duty configuration, including many Ford F-100, F-150, F-250, F-350, Bronco, and E-Series van models.

Key Features

• Engine water pump for the cooling system
• Fits applications with 2 bypass tubes
• Standard-duty configuration
• Dayco DP991 replacement part number
• Compatible with select Ford, Mercury, and Lincoln vehicles from 1969-1987

Fitment Details

• Fits 1978-1987 Ford Bronco, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1987 Ford E-150 Econoline, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1987 Ford E-150 Econoline Club Wagon, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1987 Ford E-250 Econoline, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1987 Ford E-250 Econoline Club Wagon, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1987 Ford E-350 Econoline, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1977-1987 Ford E-350 Econoline Club Wagon, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1987 Ford F-150, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1977-1987 Ford F-250, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1970-1974 Ford F-250, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1972-1987 Ford F-350, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1983 Ford E-100 Econoline, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1983 Ford E-100 Econoline Club Wagon, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1969-1983 Ford F-100, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1978-1982 Ford Fairmont, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1978-1982 Mercury Zephyr, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1977-1980 Lincoln Versailles, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1975-1980 Mercury Monarch, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1970-1979 Ford LTD, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1977-1979 Ford Thunderbird, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1970-1979 Mercury Cougar, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1978 Mercury Grand Marquis, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1970-1976 Mercury Montego, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1970-1973 Ford Mustang, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1970-1973 Mercury Colony Park, N/A, 2 Bypass Tubes; Standard Duty
• Fits 1971-1973 Mercury Marquis, N/A, 2 Bypass Tubes; Standard Duty

What This Water Pump Helps Address

• Coolant circulation problems in the engine cooling system
• Overheating caused by a worn or failing water pump
• Leak-related cooling system service on older Ford, Mercury, and Lincoln vehicles
• Restoration work on classic Ford F-100, F-150, Bronco, and E-Series models
• Replacement of a standard-duty pump with the correct 2-bypass-tube configuration

Installation Notes

Verify the vehicle’s bypass-tube count and cooling-system configuration before ordering. This part number, DP991, is listed for N/A position applications and should be matched to the engine setup used in the vehicle. For fitment searches, common long-tail queries include Dayco DP991 water pump for Ford F-150, Dayco DP991 engine water pump for Ford Bronco, and replacement water pump for 1975-1987 Ford E-150 Econoline.

Quality Assurance

Dayco supplies cooling-system components for a broad range of automotive applications, and the DP991 is cataloged for direct fitment across the listed vehicles. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.