Dodge D350 1990 - Turbocharger Noise

Air System
Page 11-6
Exhaust System mihtsMMatMM.
DODGE Turbo Diesel
^Tv] Additionally, high Intake or exhaust restrictions can cause a
vacuum between the compressor and the turbocharger
housing resulting in oil leaking by the seals.
To verify oil leakage past the seals, remove the exhaust pipe
and crossover tube and look for oil in the turbine casing and
the crossover tube. Locate and correct the restriction as
previously discussed.
Note: Excess fuel in the exhaust side of the turbocharger will
look like oil leakage. This may occur because of injector
overfueling or excessive engine operation under "no load"
conditions.
Turbocharger Noise
It is normal for the turbocharger to emit a "whine" sound that
varies in intensity depending on engine speed and load. The
sound is caused by the very high rotational speed of the rotor
assembly. Consequently, the sound will be more audible at full
speed.
Note: If possible, operate the engine at full speed and load to
verify the noise level.
^fs] Leaks in the air system, both intake and exhaust components,
can produce additional noises.
Check the air intake and crossover tube leaks.