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Low
Power/Boost |
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Air inlet restriction prevents the
engine from breathing as designed,
this increases the engine operating
temperature. An air leak in the
compressor outlet, or a partially or
blocked intercooler would restrict the
engine breathing. |
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Noisy/Whistling |
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Often the noise comes from air/gas
leakage, due to pre-turbine exhaust
gas or an air/boost leaks.
Check all joints - if noise continues
check turbocharger clearances and
wheels for housing contact. |
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Seized/Sluggish |
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If the turbocharger rotor assembly
has seized or is tight to rotate, this is
often due to lubricating oil degregation
which can cause a high build up
of carbon in the bearing housing
interior restricting rotation. Insufficient
or an intermittent drop in oil pressure
can cause the rotor to seize, as can
introducing dirt into the lubricating oil. |
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Worn/Excessive
Clearance |
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A turbocharger has specific axial
and radial rotor clearances. These
are sometimes mis-diagnosed as
'worn bearings' (See Engine manual
or Holset Distributor for details). If the
clearances are out of specification the
cause could be attributed to a lubricating
oil problem, i.e. Insufficient oil, dirt
ingress, oil contamination with coolant. |
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Remember, if the root cause of the problem is not identified and remedied your problem will not go away, it will most likely just repeat itself. |
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