Detroit Diesel MBE 4000 Service Manual page 412

6.3 TURBOCHARGER
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[a] If wheel blades are worn at the leading edges, ripped, cut, or bent backwards, clean
the exhaust manifold and the entire turbocharging air system.
[b] If there is any damage, replace the turbocharger.
4. Check the turning smoothness and uniformity of the rotor shaft.
[a] Turn the shaft alternately, in both clockwise and counterclockwise directions, until it
is clear of carbonized oil.
[b] Turn the nut on the end of the rotor shaft. Check that the shaft does not bind in some
places and spin in others (smoothness).
[c] Turn the nut on the end of the rotor shaft. Check that the same amount of turn on the
nut always causes the same amount of turn on each wheel (uniformity).
5. Check the axial play of the rotor shaft. See Figure 6-7.
NOTE:
Move the shaft in the direction shown by the arrows.
1. Turbocharger Wheel
2. Rotor Shaft
Figure 6-7
[a] Move the rotor shaft from end to end and check for friction between the wheels and
the turbo housing. Neither turbo wheel nor compressor wheel should rub against
the housing.
[b] If there is friction or contact with either side of the housing, replace the turbocharger.
6-10
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Turbocharger Axial Play
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3. Rotor Nut
4. Compressor Wheel
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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All information subject to change without notice.
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