Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
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that the bearing is worn abnormally or collision or jamming between the rotating part and the
stationary part occurs, it is required to analyze cause and carry out troubleshooting.
2. Check the run-out of rotor
Enable the dial indicator probe to be against the air compressor end, and push and pull the
rotator shaft, and measure and record difference indicated on the dial indicator, as shown in
Figure 4-40. The rotor displacement should be within 0.088mm~0.118mm, and in case of
exceeding this range, it indicates that the thrust bearing plate or thrust halfring and bearing
body are worn, and it is required to analyze cause and eliminate the problem.
Figure 4-48 Diagram for Measurement of Axial Play
3. Check the radial clearance of air compressor impeller
Press the air compressor impeller by hand in axial direction, and use a plug gauge to
measure the minimum and maximum clearance between the air compressor impeller and air
compressor scroll, as shown in Figure 4-41. This value should be within 0.4mm~0.8mm, and in
case of exceeding this range, it is required to check the bearing, and eliminate the problem.
Note: The measurement should be carried out in cold state of the turbocharger.
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