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Ouch. We've had four similar failures in the Perkins 152/203 engines caused by overheating, and one from excess ether. The ether caused cracked liner tops and broken rings. The overheating caused scuffing. Overheating resulted from overloading, plugged rad, failed thermostat - and operator not paying attention to the temp gauge..... The Mack engine Failure Analysis Manual lists several scuffing causes: Overheating, Marginal lubrication, Insufficient clearance, Improper cyl and piston finish, Improper break-in, and Oil oxidation. From your description, the first or third would seem possibilities. Overheating causes:
cooling system not operating properly
loss of coolant
excessive fuel (overloading, lugging)
retarded injector pump timing
restricted air intake
insufficient piston cooling (unlikely on the Perkins, unless the con rod bearings are too tight)
loose sleeve fit Insufficient clearance:
incorrect piston to liner clearance
tight sleeves (causing sleeve distortion)
tight piston pins
incorrect ring gap or fit in grooves Perhaps these may provide some clues. The plus - the dealer warranty.... Please let us know what you find.
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