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(XVI) Fault Diagnosis of Turbocharger on Diesel Engine
Besides diesel engine faults is disposed in accordance with fault analysis and elimination approaches
recommended in the Instruction, the working situation of turbocharger shall be checked and evaluated
to judge the errors thereof.
Turbocharged diesel engine has the common faults as follows: 1. underpower of diesel engine; 2. large
lubricating oil consumption; 3. black smoke rising from diesel engine; 4. loud noise in working.
Any of these faults may be resulted from the error inside diesel engine and that in air charging system
formed by turbocharger and diesel engine. When the fault may be caused by turbocharger, please do
not remove it from diesel engine, and definitely do not disassemble it. If replace the turbocharger only,
the trouble may not be solved, even new troubles may occur. Therefore carry out fault diagnosis at first,
and then eliminate it once find out the reason.
A turbocharger having been in normal operation is unlikely to have defect on its own in the future
service. If the impeller of the turbocharger can rotate freely not scratching the inner shell, it need not be
anxious to determine that its operation is in trouble. The experience shows that most of the faults
thereof are related to improper use. Therefore, the recommended on-engine fault diagnosis table below
is connected with the complete air charging system. After the diagnosis is finished and the details are
recorded, the turbocharger may be removed if necessary for further analysis and inspection which shall
be carried out in professional repair shop or the manufacturer of the diesel engine.
