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ACDelco 251-821 Engine Water Pump


Brand:	ACDelco
Part Number:	251-821
UPC:	00808709777038
Weight:	7.98 lbs
Condition:	New

On Sale:

$119.87

Availability:

27 in Stock

Warehouse:

US-12

Quantity:

Product Information

Description:

Get the ACDelco 251-821 Engine Water Pump for your vehicle. Buy now and secure your purchase online!

An ACDelco GM Original Equipment Engine Water Pump circulates coolant through your vehicle's radiator and engine system to help maintain proper engine temperature and performance. This original equipment water pump has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors. ⚠ WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov

Features and Benefits:

Coated seals with a stainless steel spring for durability
GM-recommended replacement part for your GM vehicle's original factory component
Manufactured to GM OE specification for fit, form, and function
Offering the quality, reliability, and durability of GM OE
Thoroughly tested for reliable, leak-resistant performance
Uniform wall sections and smooth coolant-flow cavities for efficient operation

Specifications:

Fan Clutch Included:

Height (in):

5.2 in

Housing Material:

Aluminum

Impeller Material:

Steel

Impeller Vane Quantity:

Includes Back Housing:

Installation Warnings:

Length (in):

6.5 in

Mounting Hardware Included:

Mounting Hole Quantity:

Programming Required:

Pulley Included:

Yes

Pulley Outside Diameter (in):

6.339 in

Pulley Outside Diameter (mm):

161 mm

Related Cooling Fan Components:

Thermostat And Housing Included:

Water Pump Drive Type:

Serpentine Belt

Weight (lb):

7.98 lb

Width (in):

6.4 in

Features and Benefits:

– A stain around the weep hole is acceptable. However, if a weep occurs with the engine running and the coolant system pressurized, then the water pump should be replaced.
– After installation, pressure-test the system for leaks and check for sufficient fan blade clearance between the blade and radiator shroud.
– Clean all excess dirt and debris from the water pump housing.
– Clean all sealing surfaces, and make sure all old gasket material is removed before installing your replacement component.
– Clean and reinstall the coolant recovery reservoir before flushing the cooling system.
– Do not use any non-approved flush agents and replace the coolant according to manufacturer's specifications.
– Flush the cooling system completely, using power flush equipment or thermal cycling the system with clean water three times. The most effective method of system flushing is to use a coolant exchanger, following the manufacturer's operating instructions.
– Inspect for leakage at the water pump outlet housing or the rear cover gasket, and leakage at the water pump vent or weep hole.
– Inspect related components in the cooling system, including your fan blades, fan clutch, engine mounts, radiator, belts and hoses, and reservoir.
– Never strike the water pump shaft, since this will damage the new water pump.
– Run your vehicle to increase engine temperature, and ensure the system is pressurized.
– Torque all bolts according to the manufacturer's specifications and adjust belts to proper tension (if applicable) to manufacturer's specifications.
– Use sealant tabs only if recommended. Some sealant tabs or similar compounds may restrict coolant flow through the passages of some cooling systems.
– With the new pump installed, turn the hub by hand and check for rotation.
Before purchasing and installing an engine water pump, make sure it is the correct fit for your vehicle.
Tips for Water Pump Inspection:
Tips for Water Pump Servicing & Installation:

Specifications:

Country of Origin:

Select a vehicle to narrow ACDelco 251-821 Engine Water Pump fitment info!

Last Updated: 04/27/2024

Years

Vehicle

Per Vehicle

Fit Notes

Fitment Notes

Cadillac Escalade

6.2L V8 Flex OHV,
6.2L V8 Gas OHV

1 WITHOUT MANIFOLD

Cadillac Escalade

6.2L V8 Flex OHV,
6.2L V8 Gas OHV WITHOUT MANIFOLD

1 Per Vehicle

Cadillac Escalade ESV

6.2L V8 Flex OHV,
6.2L V8 Gas OHV

ACDelco 251-821 Engine Water Pump

$119.87

Product Information

Description:

Features and Benefits:

Specifications:

Features and Benefits:

Specifications:

Select a vehicle to narrow ACDelco 251-821 Engine Water Pump fitment info!

Cadillac Escalade 6.2L V8 Flex OHV,6.2L V8 Gas OHV

1

WITHOUT MANIFOLD

Cadillac Escalade

6.2L V8 Flex OHV,6.2L V8 Gas OHV WITHOUT MANIFOLD 1 Per Vehicle

Cadillac Escalade ESV 6.2L V8 Flex OHV,6.2L V8 Gas OHV

1

WITHOUT MANIFOLD

Cadillac Escalade ESV

6.2L V8 Flex OHV,6.2L V8 Gas OHV WITHOUT MANIFOLD 1 Per Vehicle

Chevrolet Silverado 1500 4.3L V6 Flex OHV

1

WITHOUT MANIFOLDEng: LV38th VIN Digit: H

Chevrolet Silverado 1500

4.3L V6 Flex OHV WITHOUT MANIFOLDEng: LV38th VIN Digit: H 1 Per Vehicle

Chevrolet Silverado 1500 5.3L V8 Flex OHV,5.3L V8 Gas OHV

1

WITHOUT MANIFOLDEng: L838th VIN Digit: C

Chevrolet Silverado 1500

5.3L V8 Flex OHV,5.3L V8 Gas OHV WITHOUT MANIFOLDEng: L838th VIN Digit: C 1 Per Vehicle

Chevrolet Silverado 1500 6.2L V8 Gas OHV

1

WITHOUT MANIFOLDEng: L868th VIN Digit: J

Chevrolet Silverado 1500

6.2L V8 Gas OHV WITHOUT MANIFOLDEng: L868th VIN Digit: J 1 Per Vehicle

Chevrolet Silverado 1500 LD 5.3L V8 Flex OHV,5.3L V8 Gas OHV

1

WITHOUT MANIFOLD

Chevrolet Silverado 1500 LD

5.3L V8 Flex OHV,5.3L V8 Gas OHV WITHOUT MANIFOLD 1 Per Vehicle

Chevrolet Suburban 6.2L V8 Flex OHV,6.2L V8 Gas OHV

1

WITHOUT MANIFOLD

Chevrolet Suburban

6.2L V8 Flex OHV,6.2L V8 Gas OHV WITHOUT MANIFOLD 1 Per Vehicle

Chevrolet Suburban 5.3L V8 Gas OHV

1

WITHOUT MANIFOLD

Chevrolet Suburban

5.3L V8 Gas OHV WITHOUT MANIFOLD 1 Per Vehicle

Chevrolet Suburban 5.3L V8 Flex OHV

1

WITHOUT MANIFOLD

Chevrolet Suburban

5.3L V8 Flex OHV WITHOUT MANIFOLD 1 Per Vehicle

Chevrolet Tahoe 6.2L V8 Flex OHV,6.2L V8 Gas OHV

1

WITHOUT MANIFOLD

Chevrolet Tahoe

6.2L V8 Flex OHV,6.2L V8 Gas OHV WITHOUT MANIFOLD 1 Per Vehicle

Cadillac Escalade

6.2L V8 Flex OHV,
6.2L V8 Gas OHV

6.2L V8 Flex OHV,
6.2L V8 Gas OHV WITHOUT MANIFOLD

1 Per Vehicle

Cadillac Escalade ESV

6.2L V8 Flex OHV,
6.2L V8 Gas OHV

6.2L V8 Flex OHV,
6.2L V8 Gas OHV WITHOUT MANIFOLD

1 Per Vehicle

Chevrolet Silverado 1500

4.3L V6 Flex OHV

WITHOUT MANIFOLD
Eng: LV3
8th VIN Digit: H

4.3L V6 Flex OHV WITHOUT MANIFOLD
Eng: LV3
8th VIN Digit: H

1 Per Vehicle

Chevrolet Silverado 1500

5.3L V8 Flex OHV,
5.3L V8 Gas OHV

WITHOUT MANIFOLD
Eng: L83
8th VIN Digit: C

5.3L V8 Flex OHV,
5.3L V8 Gas OHV WITHOUT MANIFOLD
Eng: L83
8th VIN Digit: C

1 Per Vehicle

Chevrolet Silverado 1500

6.2L V8 Gas OHV

WITHOUT MANIFOLD
Eng: L86
8th VIN Digit: J

6.2L V8 Gas OHV WITHOUT MANIFOLD
Eng: L86
8th VIN Digit: J

1 Per Vehicle

Chevrolet Silverado 1500 LD

5.3L V8 Flex OHV,
5.3L V8 Gas OHV

5.3L V8 Flex OHV,
5.3L V8 Gas OHV WITHOUT MANIFOLD

1 Per Vehicle

Chevrolet Suburban

6.2L V8 Flex OHV,
6.2L V8 Gas OHV

6.2L V8 Flex OHV,
6.2L V8 Gas OHV WITHOUT MANIFOLD

1 Per Vehicle

Chevrolet Suburban

5.3L V8 Gas OHV

5.3L V8 Gas OHV WITHOUT MANIFOLD

1 Per Vehicle

Chevrolet Suburban

5.3L V8 Flex OHV

5.3L V8 Flex OHV WITHOUT MANIFOLD

1 Per Vehicle

Chevrolet Tahoe

6.2L V8 Flex OHV,
6.2L V8 Gas OHV

6.2L V8 Flex OHV,
6.2L V8 Gas OHV WITHOUT MANIFOLD

1 Per Vehicle