SERVICE MANUAL
PRE-DISASSEMBLY CHECKS
Make
the
following
checks
and
if
the
turbocharger meets these requirements, it can be
considered satisfactory and reinstalled on the engine. If
it does not meet the requirements, it must be rebuilt
(refer to "Disassembly").
CHECK FOR FREE ROTATION
1.
Stand the turbocharger on bench with shaft in a
horizontal position.
2.
Wheels must spin freely when turned by hand.
CHECK AXIAL END PLAY
1.
Clamp turbocharger in a vise and position a dial
indicator with a magnetic base on the frame of
the vise (Fig. 8). (Any type base may be used as
long as a similar position can be obtained. )
Place the foot of the indicator on the turbine end
of the shaft.
Fig. 8. Checking Axial End Play
2.
Move the shaft back and forth by hand and
record the reading.
3.
If the reading exceeds the specifications, the
turbocharger
must
be
disassembled
and
repaired (see "Specifications").
CHECK RADIAL SHAFT MOVEMENT
1.
Remove the protective cover from the oil drain
port in the center housing.
2.
Install a two inch contact point extension on the
dial indicator and position the indicator as shown
in Fig. 9. The indicator contact point must
contact the turbine shaft through the oil drain
port in the center housing.
Fig. 9. Checking Radiator Shaft Movement With Housing
Installed
3.
Hold both ends of the rotating assembly and
move the shaft up and down, parallel to the
extension of the dial indicator (Fig. 9), Be sure to
exert equal pressure on both ends of the rotating
assembly.
4.
If the readings are not within specifications, the
turbocharger
must
be
disassembled
and
repaired (see "Specifications").
5.
If the indicator readings taken in Step 3 were
satisfactory,
but
interference
between
the
compressor housing and compressor wheel is
suspected, punch mark the compressor housing,
center housing and back plate to facilitate
reassembly and remove the compressor housing
and diffuser.
6.
Install the dial indicator as outlined in CTS-4104
Page 9
CTS-4104
PRINTED IN UNITED STATES OF AMERICA
Page 9
