The water pump is the heart of the engine’s cooling system. It is the water pump’s job to constantly circulate the coolant transparent the whole cooling circuit and also thus control the coolant circulation rate. Water pumps are most generally driven externally by a pulley/belt combination.

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A poor water pump can reason an engine come overheat. Here, we describe how to inspect and diagnose a failure water pump. But it is equally necessary to examine the belt drive system that is steering the water pump. A negative belt and tensioner cause premature bearing and also shaft failure and also as such substantially reduce pump life. Vice versa, a leaking water pump inevitably influence the belt and tensioner. That is why gates recommends an altering the water pump, belt and other drive materials at the same time as great preventive maintenance.

HOW come DETECT A poor WATER PUMP?

The adhering to signs indicate that a water pump demands to it is in replaced:
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1. Weep feet leakage

Appearance: The pump"s interior mechanical seal seals the column towards the cooling circuit, protecting the bearings by avoiding coolant indigenous passing into the bearing assembly. When a water pump is new, some seepage indigenous the weep feet is typical as that takes about ten minutes of procedure for the mechanically seal to effectively seat itself (break-in period). More pronounced seepage and also drips from the weep feet after this break-in duration or a huge coolant bleed mark roughly the weep hole space abnormal and indicate brewing water pump failure.

Cause: Contaminated coolant is the main cause of weep hole leakage.

Solution: completely flush the cooling system prior to installing the new pump and also refill the mechanism with the correct auto manufacturer’s recommended coolant.

Never dry operation a water pump, not even for a couple of seconds. Dry to run of the pump damages its mechanical seal.


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Replacing the water pump is crucial for a finish overhaul. Find out much more by downloading and install the product brochure.


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2. Leakage indigenous the mounting surface

Appearance: Seepage, drips or large coolant bleed marks on or about the mounting surface ar or top top the housing.

Cause: improper water pump environment or improper use of seals/gaskets or sealant.

Solution: In case of a recently installed brand-new water pump: carefully remove, check and also re-install the water pump. Strictly follow the speak specifications. Make sure seals/gaskets room in perfect condition and also are installed correctly. As soon as sealant is prescribed, clean the rims that the component and the mounting surface and apply brand-new sealant evenly along the leaf of the part. If the leakage is not the consequence of an improperly installed new water pump, the pump need to be replaced immediately.


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3. Rust and also corrosion

Appearance: Rust and corrosion on the surfaces of the water pump, e.g. Corrosion of the impeller fins makes the pump ineffective in moving the coolant.

Cause: Contaminated coolant, non-compatible coolant or mixing coolants of various chemistries. Another possible cause might be a defective push cap bring about air bubbles, speeding up the rust process.

Solution: replace the water pump. Thoroughly flush the cooling system before installing the new pump and also refill the mechanism with the correct automobile manufacturer’s encourage coolant. Check the pressure cap and replace if defective.


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4. Deposit build-up

Appearance: Deposits, sludge and also scale build up top top the inside, clogging the water pump and hampering appropriate functioning of its individual components.

Cause: Contaminated coolant, non-compatible coolant or mixing coolants of various chemistries.

Solution: Replace the water pump. Completely flush the cooling system before installing the new pump and also refill the system with the correct vehicle manufacturer’s recommended coolant.


5. Cavitation

Appearance: Vapour caries (“bubbles”) in the coolant collapse v explosive force, pockmarking the pump’s separation, personal, instance components. The pockmarked areas then corrode away.

Cause: The formation of bubbles at the coolant inlet of the pump. Together the pressure boosts in the system, the bubbles implode and also cause harm.

Solution: change the water pump. Completely flush the cooling system before installing the new pump and refill the device with the correct vehicle manufacturer’s encourage coolant.


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6. Damaged bearing

Appearance: through the engine off, inspect the condition of the bearing by spring for any side-to-side play in ~ the shaft. Use hand pressure – there should be no play in ~ all. Also, rumbling or screeching noises coming from the water pump suggest a worn bearing.

Cause: A misaligned belt reasons excessive wear. An over-tensioned belt reasons overload top top the bearing, accelerating wear. A damaged mechanically seal enables coolant come leak with the bearings and also wash far the lubricator.

Solution: replace the water pump and make sure to inspect the belt drive system: belt, tensioner, pulleys, belt tension and alignment.

Never compromise on water pump quality! Cheap water pumps carry out not monitor the OE prescription in regards to mechanical seal and also bearing quality.


7. Damaged or damaged shaft

Appearance: The obelisk is bent or broken. A clean break indicates an “instantaneous” fracture brought about by suddenly overload or imbalance. If the broken shaft is discoloured (usually blue), the damage was gradual, indicating too much heat buildup before the shaft broke.

Cause: A misaligned belt causes excessive wear. An over-tensioned belt imposes a an effective bending pressure on the shaft resulting in shaft bending or at an early stage shaft fracture. Excessive vibrations as result of lack of maintenance.

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Solution: replace the water pump and also make certain to check the belt journey system: belt, tensioner, pulleys, belt tension and also alignment. If equipped with a water pump placed fan, check the fan/fan clutch assembly. The fan may not be squarely an installed on the shaft. A bending or damaged fan, a worn spacer, or a worn or damaged fan clutch could also be determinants contributing come the break.