why do water pumps fail? - asc...

Why do Water Pumps Fail? Copyright © 2013 ASC Industries, Inc. Cooling System Contamination Rust & Corrosion • Not ﬂushing the cooling system • Old or used coolant • Deposits from system components • Flakes from excessive sealant use • Improper coolant/water mixture Shaft Breakage Cause: Bearing Overload • Evidenced by a clean break rather than blue heat discoloration • Result of vibration or imbalance • Always check alignment of pulleys and condition • Tighten belts with a belt tensioner • Check condition of fan/fan clutch • Evenly tighten all mounting bolts

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Why do Water Pumps Fail?

Cooling System Contamination

Rust & Corrosion• Notflushingthecoolingsystem• Oldorusedcoolant• Depositsfromsystemcomponents

• Flakesfromexcessivesealantuse• Impropercoolant/watermixture

Shaft Breakage

Cause: Bearing Overload• Evidencedbyacleanbreakratherthan blueheatdiscoloration• Resultofvibrationorimbalance• Alwayscheckalignmentofpulleysandcondition• Tightenbeltswithabelttensioner• Checkconditionoffan/fanclutch• Evenlytightenallmountingbolts

Why do Water Pumps Fail? (continued)

Casting Breakage 1

Casting Breakage 2

Thermal Shock to Seal

Cause: Excessive Vibration/Imbalance• Breakagenormallyoccursaroundbearingsupport• Resultofvibrationorimbalanceresultingfrom awornfanclutchorbentfan• Tightenbeltswithabelttensioner• Checkconditionoffan/fanclutch• Evenlytightenallmountingbolts

Cause: Excessive Torque When Mounting• Overtighteningboltscausehousingtoshatter• Usecorrecttightningsequenceifapplicable• Usemaximum22ft./lbs.whentightening

Cause: Adding Coolant to a Hot System• Nosignsofcontaminationpresent• Damageappearsasadiametricalcrackacross sealfaceormatingring• Fillsystemwithcoolantbeforestartingengine• Ifoverheated,allowenginetocoolbefore fillingsystemwithcoolant

Why do Water Pumps Fail? (continued)

Weep/Leak Differences

Corrosion Erosion

Cause: Cavitation• Vaporbubblesforminthecoolingsystemand implode• Causesabrasivealuminumoxideformation andcorrosionerosion

Recommendation:• Repairallcoolingsystemleaks,evenifminor• Testpressurecapsregularly• Keepcoolingsystemcleanwithmanufacturer’s recommendedcoolant

Normal Weep Stain

Leaking Pump

Asmallamountofweepageisexpectedduringthenormaloperationofawaterpump.Theweepageisnecessarytomaintainlubricationofthesealfaces.

Asawaterpumpsealbeginstofail,coolantwillflowfromtheweepholeatamuchfasterrate.Thisresultsinmorevisiblestaining,indicatingthepumpshouldbereplaced.Leftunattended,theexessiveleakagewillleadtobearingfailure,completepumpfailureandpossibledamagetorelatedcoolingsystemcomponents.

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Why do Water Pumps Fail? · 2019-12-30 · normal operation of a water pump. The weepage is necessary to maintain lubrication of the seal faces. As a water pump seal begins to fail,

Introduction to ASC certification · Introduction to ASC certification. The ASC Salmon Standard Why the ASC matters. Created Date: 6/30/2016 11:58:10 AM