A common method for diesel engine piston cooling is to deliver oil through the connecting rod into a void space in the piston head and then allow the piston motion to distribute the oil to cool the piston crown and drain the oil back to the crankcase. This procedure is known as the _____________ .
• Different diesel piston cooling methods: splash, spray, and designs that route oil through the connecting rod • How oil delivered into a void space in the piston head behaves when the piston moves up and down • Distinction between oil that is simply splashed/sprayed from outside versus oil that is carried inside the rod and piston assembly
• Which of these methods best describes oil being pumped through the connecting rod into the piston and then redistributed by the piston’s own motion? • Does the term used in the choices suggest oil coming from nozzles below the piston, from random splashing in the crankcase, or from being carried inside and then redistributed by reciprocating motion? • Think about which name sounds like oil is being shaken or flung around inside a cavity as the piston moves.
• Identify which term is typically associated with jets/nozzles aimed at the underside of the piston • Identify which term is associated with general crankcase splashing without internal passages • Match the term that implies oil being carried up, then redistributed by reciprocating motion inside a cavity, and then draining back to the crankcase
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