6/11/2015 4WaystoMeasureMainBearingClearanceofTwoStrokeMarineEngine

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4WaystoMeasureMainBearingClearanceofTwoStrokeMarineEngine

MARCH2,2012BYKARANC

Amarineenginecomprisesofseveraltypesofbearingswhichsupporttherotatingandreciprocatingcrankshaft,camshaft,andcrossheadoftheengine,enablingthemarineenginetoperformthedesiredoperationofpowergeneration.Itisveryimportanttomaintainagoodqualityandquantityoflubricatingoiltoallthesebearingsinordertoavoidbreakdownoftheengine.

Themainbearingofamarineenginesupportsthelongrunningcrankshaftthroughouttheenginelength.Thismakesitimperativetochecktheconditionofthebearingatregularintervaloftime.

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6/11/2015 4WaystoMeasureMainBearingClearanceofTwoStrokeMarineEngine

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Theclearancemeasurementofthemainbearingdeterminestheamountofweardownthebearinghasbeensubjectedto.Therearevarioustypesofmethodsadoptedbydifferentmarineenginemanufacturerstomeasuretheclearanceofmainbearingofmarineengine.Followingaresomeofthemostprominentmethodsusedonboardshipstomeasuretheclearanceofmainbearing:

1)BridgewithDepthGauge

ThismethodisusedinSULZER2strokemarineengineswherethebearingsshellisremovedalongwiththekeep(thebearingshellislinedwiththekeep).Afterthatabridgeisfittedoverthetopofjournalpin,fromporttostarboard,makingabridgeoverthecrankshaftwithtwoendssupportedonthecrossgirder.

6/11/2015 4WaystoMeasureMainBearingClearanceofTwoStrokeMarineEngine

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Asimpleverniertypedepthgaugeistheninsertedintheholeprovidedonthebridgeandthescaleofdepthgaugeisrestedonthecrankshaftpin.Thetotaldepthonthescaleismeasuredandcomparedwiththepreviousreadingandthereadinginthemanualforcalculatingtheweardownofbearing.

InoldmodelSULZERengines,acollarisprovidedinthebearingshellalongwithasmallhole.Thuswithoutremovingthekeep,thebridgeisfittedadjacenttothekeepandthedepthgaugeisusedfromtheholeprovidedintheshelltomeasuretheshellweardown.

2)BridgeWithFeelerGauge

Insomeengines,afterremovingtheshellandthekeep,thebridgeisinstalledasexplainedintheabove

6/11/2015 4WaystoMeasureMainBearingClearanceofTwoStrokeMarineEngine

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point.Also,inplaceofdepthgauge,afeelergaugeisusedtomeasuretheclearancebetweenthejournalpintopandthebridgebottom.Thebridgeusedhereisdifferentintermsofheightandthegapbetweenthepinandthebridgeisverylessascomparedtothatofthebridgeusedintheabovementionedmethod.

3)TelescopicorSwedishFeelerGauge

InengineslikeMANB&W,thisisthemostcommonmethodusedtomeasurethebearingclearanceofthetopshell.Inthismethodthereisnoneedtoremoveanyconnectionorkeepformeasuringtheclearance.

Thetelescopicgaugeisinsertedbetweenthegapofthecrankwebandthebearingkeep.Whenthetipreachestheshelltop,thefeelerisinsertedbetweentheshellandthepintochecktheclearance.

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4)DialtypeDepthGauge

ThismethodisusedinnewMANB&Wengines(SMCC)whichdoesnotrequirethetopkeeptoberemoved.Thelubeoilpipeconnectionscrewholeisinthebearingkeepwhichcanbeaccessedfromtheholeonthebearingshell.

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Thedialgaugeisinsertedinthisscrewholeandthereadingistakenastheclearanceforuppershell.ForcompletebearingoverhaulprocedurepleasedreadProcedureforRemovingMainBearingofMANB&W

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