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Sound increases as engine speed increases.
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- Valve mechanism is defective. - Incorrect valve clearance - Worn valve rocker - Worn camshaft - Broken valve spring
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- Worn crankshaft main bearing - Worn connecting rod bearing (big end)
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- Loose flywheel mounting bolts - Damaged engine mounting
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High-pitched clank (Spark knock)
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Sound is noticeable when accelerating with an overload.
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- Ignition timing advanced - Accumulation of carbon inside combustion chamber - Wrong spark plug - Improper gasoline
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Clank when engine speed is medium (1,000 to 2,000 rpm).
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Sound is reduced when fuel injector connector of noisy cylÂinder is disconnected. (NOTE*)
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- Worn crankshaft main bearing - Worn bearing at crankshaft end of connecting rod
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Knocking sound when engine is operating under idling speed and engine is warm
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Sound is reduced when fuel injector connector of noisy cylÂinder is disconnected. (NOTE*)
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- Worn cylinder liner and piston ring - Broken or stuck piston ring - Worn piston pin and hole at piston end of connecting rod
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Sound is not reduced if each fuel injector connector is disÂconnected in turn. (NOTE*)
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- Unusually worn valve lifter - Worn cam gear - Worn camshaft journal bore in crankcase
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- Insufficient generator lubrication
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- Defective generator brush and rotor contact
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Gear scream when starting engine
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- Defective ignition starter switch - Worn gear and starter pinion
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Sound like polishing glass with a dry cloth
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- Loose drive belt - Defective water pump shaft
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- Loss of compression - Air leakage in air intake system, hoses, connections or manifolds
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- Loose timing belt - Belt contacting case/adjacent part
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- Incorrect valve clearance
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