Hour Turbocharger Inspection - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual

3. 100-Hour Turbocharger Inspection

A. Complete the "50-Hour Turbocharger Inspection" in this chapter.
B. Examine the turbocharger. Look for nicked or bent turbine blades and any damage from
objects. If any turbine blade is nicked, bent, or damaged, replace the turbocharger.
C. Examine all of the air ducts and connections for leaks. Look for leaks at the manifold
connections to the turbine inlet and at the exhaust manifold gasket. Identify and correct the
cause of any leaks.
D. Replace any leaky gaskets. Two gaskets are necessary at the exhaust port.
E. Make sure the torque on the mounting bolts that attach turbine side of the turbocharger and
transition assembly to the mounting bracket agree with the Standard Torque Tables in the
latest revision of the Service Table of Limits - SSP-1776.
NOTICE: The clearance at the turbine blade tip, measured as shown in Figure 3, identifies the
general condition of the turbocharger.
F. Remove the exhaust pipe from the turbine discharge port and measure the clearance between
the turbine blades and housing.
G. Use a feeler gage to measure the space between the impeller blades and the turbine housing at
intervals of 90° as shown in Figure 3.
NOTICE: In the next step, do not insert the feeler gage more than 0.050 in. (1.270 mm).
For example: A + B +C +D = 0.064 + 0.120 + 0.053 + 0.081 = 0.318 /4= 0.0795 in. (2.032 mm)
Discharge Port of Turbine Showing Locations for Clearance Measurements
H. Measure the maximum clearance between the housing and the blade tips in the four locations.
If the maximum clearance exceeds 0.120 in.(3.048 mm) at any point, replace the
turbocharger. Refer to the sections "Turbocharger Removal" and "Turbocharger Installation"
in this chapter.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Figure 3
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