The water pump move coolant throughout your engine and also radiator. If the seizes, her engine will certainly overheat very rapidly. Also, seals within of the pump deserve to deteriorate and an outcome in a lose of coolant.

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This article applies to the dodge Ram 3rd Generation (2002-2008).

The water pump is thrust by the accessory belt top top the Dodge ram 5.7, 4.7, and also 3.7 engines. The belt transforms the water pump pulley that is bolted to the shaft, which connects come the impeller. As the engine rotates, the impeller transforms at the same speed and also creates sufficient centrifugal pressure to force coolant right into the countless passages that the engine.

Water pumps save on computer two key areas that are prone come failure. Between the shaft and housing are bearings that are designed to stand up to the tension created by the accessory belt. Damages to these bearings can reason water pump noise and loss the rotation. To keep the coolant inside of the pump, a seal is offered that surrounds the shaft.

Dodge used a viscous pan on these model years instead of one electric. This type of pan threads into the water pump shaft and is locked in location by a huge nut. Remove of this fan can be tricky in ~ times, yet with the right tools it have the right to be done.


Materials NeededWater pump2 gallons of coolant (use Mopar HOAT coolant if your truck has that currently in it)Fine sandpaper or steel woolShop ragsBrake parts cleaner10mm wrench3/4" wrenchSocket collection (8mm-19mm)Ratchets (3/8" and 1/2")Flat head screwdriverPliers (channel lock and also hose clamp types)Drain panRatchet extensions 3" and 5"

Step 1 – drainpipe the engine coolant

Place your drain pan under the radiator. Take turn off the radiator lid on the top passenger"s side corner of the radiator by pushing down while twisting the cap counterclockwise. Top top the bottom corner of the radiator that the driver"s side is a plug. Rotate this plug counterclockwise with a 3/4" wrench to drain the coolant indigenous the radiator.

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Figure 1. The radiator drain plug.

Step 2 – Disconnect the an adverse battery cable

Use a 10mm wrench to eliminate the an adverse (black) terminal indigenous the battery post. Make sure the cable is secured far from the battery or covering in electrical tape to minimization the possibility of the current jumping.

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Figure 2. The red one is positive, while the blue one is negative.

Step 3 – remove the coolant restore tank and also washer fluid reservoir

There space some distinctions in the procedure because that this step in between the 5.7 hem engine and 4.7/3.7 engines.

The 4.7 and also 3.7 have a coolant recovery tank and washer fluid reservoir that is next by side. First, remove the bolt at the height of the restore tank. Remove the hose associated to the tank. Be cautious while lifting the recovery tank native the engine, or coolant may spill. There are two electric connectors ~ above the passenger"s next of the washer liquid reservoir along with a small hose listed below these connectors. To express the tabs on the connector plugs if pulling them off the sensors. Then twist and also pull the hose turn off of the reservoir. You"ll want to location a lid onto the reservoir hose fitting to keep the fluid from draining.

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Figure 3. The washer fluid reservoir sensor connectors and also hose top top the 3.7 and 4.7 engines.

The 5.7 engine coolant recovery tank is located above the radiator. There are two bolts at each side of the tank. Slide any type of hoses linked to the tank off and be cautious as you lift the tank the end of the engine bay, or coolant might spill. Top top the center of the washer fluid reservoir is a tab the holds the reservoir come the fan shroud. Utilizing a level head driver or prybar, pry the reservoir away from the pan shroud. Make sure to disconnect any hoses connected to the reservoir if you decide to fully remove the from the engine bay.

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Figure 4. The 4.7 engine bay. You can see the radiator lid circled in red.

Step 4 – eliminate the viscous pan from the water pump

It"s best to use a effectively sized pan clutch wrench because that this purpose; although, a large wrench or an adjustable wrench can additionally be used. Top top the water pump wheel are little holes that pins can be slide into. Once you have actually the pan clutch removal tool, slide the pins into these holds. You can see a homemade variation of this device in number 5. If holding the water pump stationary, usage your other wrench to ease the nut on the pan counterclockwise. This direction of rotation applies to you when facing the former of the engine.

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Figure 5.The viscous fan an installed to the water pump.
Pro Tip

You can likewise tap the wrench through a hammer to rest the seed free, yet impacting the viscous facility housing may damages it.


Step 5 – eliminate the pan shroud (optional)

This action is optional. Removing the shroud enables for an ext working room. In ~ the peak of every side the the shroud (about 2 inches down) room bolts stop the shroud in place. In ~ the bottom of each side of the shroud girlfriend will check out a tab involved into clips. Come disengage these tabs, lift the shroud straight up.

Step 6 – eliminate the accessory journey belt and idler pulley

Locate the journey belt tensioner ~ above the front passenger"s side of the engine. Use a large 3/8" ratchet (or journey belt tool) and also rotate the wheel to the best to relax the belts tension. On slide the belt off the accessories and also inspect that for damages to deem it reusable.

The idler pulley-block is directly to the right of the drive belt tensioner. One bolt holds it to the engine.

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Figure 6. The accessory journey belt diagram.

Step 7 – eliminate the water pump

There space eight bolts holding the water pump to the engine. 3 of this bolts are longer than the others. Keep in mind their location for basic installation. ~ above the passenger"s side of the water pump room three hoses. Eliminate these by releasing the spring clamps tension and sliding them turn off the pump. Part twisting may be compelled to develop movement.

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Figure 7. The water pump has been unbolted.

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Figure 8. The eliminated water pump.

Step 8 – install the brand-new water pump

Clean the water pump mating surface on the block. Fine sandpaper and also steel structure work finest for this area. Spray some kind of clean solvent (similar to brake parts cleaner) top top a rag and wipe away any type of excess dirt/dust.

Install the new gasket ~ above the water pump. Make sure the gasket is completely pressed into the pump.

If her water pump includes a thermostat, download it right into the new pump with the spring finish inside that the pump. Some thermostats will have a small tip on the rubber diaphragm encountering away native the water pump. This tip requirements to sit in ~ the 12 o"clock position.

Start the water pump bolts by hand until all room snug. Tighten the bolts in a criss-cross pattern. The speak spec is 25 ft./lb. Because that the 4.7 and also 3.7 engines. Because that the Hemi, the torque spec is 30-35 ft./lb.

Re-install the coolant hoses ~ above the pump. Girlfriend will desire to use worm equipment clamps instead of the manufacturing facility spring clamps if they appear weak.

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Figure 9. Surroundings bolt locations.

Step 9 – Re-install the idler pulley and also accessory journey belt

Install the idler sheave first. When both pulleys have been tightened, start routing the drive belt. On slide the belt ~ above the idler wheel last.

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Figure 10. The journey belt diagram.

Step 10 – Re-install

Re-install the fan shroud, viscous fan, coolant recovery tank, and washer fluid reservoir.

Slide the fan shroud tabs back into the clips, and then bolt the shroud in place. Subject the viscous fan onto the water pump. Psychic to organize the water pump stationary and also turn the fan nut clockwise. Download the washer liquid reservoir first, and also then the coolant recovery tank. Make certain all hoses and both electric connectors for the washer liquid reservoir room re-installed.

Figure 11. A small diagram to assist put things ago into place.

Step 11 – Fill and bleed the cooling system

Use a 50/50 mix the coolant and distilled water. Trucks making use of HOAT (Mopar) coolant will have to use this coolant again, unless you fully flush the cooling system. Afterwards, the do the washing up standard eco-friendly coolant deserve to be used.

Re-connect the an adverse battery cable. Completely fill the radiator and also re-install the radiator cap. Fill the coolant recovery tank come the complete cold mark. For trucks v the thermostat located at the reduced radiator hose, eliminate the top radiator hose and fill the engine through coolant together well.

Leave only the recovery tank cap off and also start the engine. Revolve the warmth on to the max setting. Permit the engine operation for around one minute. This will purge air from the system. Download the restore tank cap, and also restart the engine. Clock the coolant temp gauge come make certain it does no rise over the halfway mark. If that does, you might still have air in the system and also will should repeat the bleeding procedure. Wait for the engine come cool before re-opening the restore tank cap. Top off the coolant together needed.

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Figure 12. Mopar coolant for your Ram.

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