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Air filter is too   dirty

Replace the air   filter

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The pipeline between   air filter and compressor was blocked

Clean the sundries   or replace the damaged components

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The pipeline between   compressor and engine intake manifold was blocked

Clean the sundries   or replace the damaged components

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Pipeline air leakage   between air filter and compressor

Replace the sealing   element or fasten the fastener

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Pipeline air leakage   between compressor and engine intake manifold

Replace the sealing   element or fasten the fastener

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Air leakage at   junction surface between engine intake manifold and cylinder head

Replace the washer   or fasten the fastener

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Engine exhaust   manifold was blocked

Check and clean the   sundries

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Muffler or exhaust   manifold was blocked

Clean the sundries   or replace

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Air leakage at the   junction surface of engine exhaust pipe and cylinder head

Replace the washer   or fasten the fastener

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Air leakage at the   connection portion of turbocharger air inlet and engine exhaust pipe

Check the exhaust   pipeline

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Air leakage at   turbine exhaust pipe

Check the pipe

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Tubocharger oil   return pipeline was blocked

Clean the sundries   and replace the oil return pipe

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Engine crankcase   breather was blocked

Check and clean the   sundries

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Fouling or coking in   the bearing housing

Replace engine oil   and oil filter,overhaul or replace the turbocharger

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Incorrect adjustment   of fuel injection pump or fuel injector

Replace or adjust   the related components

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Incorrect engine   timing

Replace the worn   components

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Engine pistion ring   or cyliner liner wear

Repair the engine

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Engine internal   parts problem(valve,piston)

Repair the engine

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Compressor wheel or   diffuser fouling

Use non-alkaline   cleaner or soft brush to clean,replace oil filter

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Turbocharger damage

Analyse the failure   of turbocharger,find out the cause of damage,overhaul or replace the   turbocharger