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4.3.19 Checking belt tensioner
4.3.20 Checking fan bearing
4.3.21 Checking turbocharger
Perform visual check on turbine and compressor blades of the turbocharger for damage, crack, or contact with their
housings when a light finger pressure applied on them. And check the turbocharger shaft for not being free spinning.
In case that any of the above problems occur, the turbocharger should be replaced.
4.3.22 Checking vibration damper
Check the vibration damper for damping fluid (silicon fluid) leak and surface dents. Also examine the thickness of
damper to confirm if the damper has become deformed. In case that any of the above problems occur, the damper
should be replaced.
4.3.23 Checking air compressor
ŸWarning: Air pressure should be released from the air system before removing parts from the air
compressor to avoid personal injury.
Rotate the belt tensioner clockwise and remove the drive
belt. Turn the fan to check the fan bearing for normality.
When rotating the fan, there should be no vibration or
excessive axial movement. Change the fan hub when
necessary.
(1) Rotate the belt tensioner clockwise, and remove the
drive belt. Turn the tensioner pulley to check it for seizure
or radial/axial movement, by which to determine if there is
scratch or wear on the bearing surface of the tensioner
pulley. Swing the tensioner arm to check if the spring
performs well.
(2) Install the drive belt and make a visual inspection after
the installation to make sure that the belt center line is in
alignment with the center lines of the pulleys.
Air outlet pipe
Check the air outlet pipe and joints for carbon deposit.
Clean or replace relevant parts based on the deposit.
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