Chapter III Malfunction Diagnosis and Troubleshooting
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
117
Oil leakage is a common malfunction for the turbocharged engine. Find out and clear the malfunction in
time to avoid failure of the turbocharger. The following shows the malfunctions that can result in oil
leakage:
(1) The blockage in the engine air cleaner or in the air intake pipe results in an overhigh air intake
pressure.
(2) The bending or damage of turbocharger oil return hose results in throttled oil return.
(3) The carbon deposit in the intermediate body fuel chamber results in improper oil return.
(4) Air leakage from the connecting pipe between the gas compressor housing exhaust port and the
engine air intake pipe.
(5) Air leakage from the connector between the turbo housing intake port and the exhaust pipe exhaust
port
Malfunction diagnosis for oil
leakage at the turbo
①
Check whether the axial/radial
clearance
of
turbocharger
is
largened (whether the compressor
blade has interference with its
housing)
Eliminate the factors that largen the
turbocharger clearance or replace
the turbocharger
②
Check whether the idle speed
time of engine is too long (more than
20 min)
Clean the lubricating oil and avoid
long time idling
The redundant lubricating oil will be
burnt and no measures are needed
③
There is too much lubricating oil
added before
④
Check whether the engine
crankcase respirator is blocked
See the maintenance manual of
engine manufacturer for check and
repair
⑤
Check whether the turbocharger
lubricating oil return hose is blocked
Clean it and clear the throttling
factor, replace the lubricating oil and
oil return pipe if necessary
⑥
Check whether there is dirt deposit
or lubricating oil coking in the
intermediate housing of turbocharger
Repair the engine lubrication system
and replace the turbocharger
⑦
Check whether there is too much
lubricating oil in the crankcase
Adjust the oil in the crankcase to a
proper level
⑧
Check
whether
there
is
malfunction in the engine (serious
blow-by of piston or overhigh
pressure in the crankcase)
See the maintenance manual of
engine manufacturer for check and
repair
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