Lycoming TEO-540-C1A Maintenance Manual page 380

CAUTION
NOTICE: Every time a V-band coupling is assembled, install a new gasket within the
coupling. Make sure that the seal is complete when a V-band coupling is assembled
over an exhaust system component. (Refer to the latest revision of Service
Instruction SI-1238 for assembly and torque procedures for V-band couplings.)
L. Install the V-band couplings (Figure 3) as follows:
CAUTION
(1) Slide the V-band coupling with a new gasket over the correct exhaust pipe.
(2) Point the lip of the new gasket in the direction of the correct exhaust pipe.
(3) Adjust all of the pipes so the slip joints are engaged at the same distance for each joint.
(4) With the pipe transition attached, assemble the V-band coupling over both pipes and the
gasket.
(5) Press the V-band coupling on the flanges.
(6) Engage the T-bolt.
(7) Use a torque indicator wrench to tighten the different types of coupling nuts
approximately 70% of the specified torque values identified below:
(a) Split type locknut with a specified torque of 85 in.-lb. (9.6 Nm).
(b) Drilled hex nut secured with safety wire, having a specified torque of 75 in.-lb. (8.5
Nm).
(8) Tap the outer surfaces of the coupling with a rubber mallet to apply equal band tension.
M. Make sure there are no gaps at pipe connections and all pipes are correctly aligned before the
final torque of the fasteners.
CAUTION
N. Once the alignment and configuration are validated, torque the exhaust flange nuts to 17 ft.-
lb. (23 Nm). Torque the hardware fasteners for each attaching component equally and
uniformly on each side, one component at a time per the Standard Torque Tables in the latest
revision of the Service Table of Limits - SSP-1776.
O. Install the heat shield at the joint between the right rear exhaust pipe and the intermediate
crossover pipe with two clamps.
P. Torque the clamps of the heat shield per the Special Torque Requirements Tables in Part 1,
Section V in the latest revision of the Service Table of Limits - SSP-1776.
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Page 350
DURING V-BAND COUPLING INSTALLATION, USE CARE NOT TO
SPREAD OR FORCE THE COUPLING BEYOND ITS NORMAL OPEN
POSITION TO PREVENT DISTORTION OF THE COUPLING. THIS
DISTORTION CAN CAUSE AN INEFFECTIVE SEAL OR RUPTURE THE
METAL WHICH CAN RESULT IN FAILURE OF THE COUPLING.
PROPER INSTALLATION IS CRITICAL. TUBES AND COMPONENTS
TO BE JOINED MUST BE ALIGNED WITH EACH OTHER BEFORE
INSTALLATION OF THE V-BAND COUPLING. FLANGES MUST ALSO
BE ALIGNED CORRECTLY WITH ZERO GAP BETWEEN FLANGE
FACES PRIOR TO V-BAND COUPLING INSTALLATION TO ENSURE
GOOD JOINT PERFORMANCE.
TORQUE HARDWARE FASTENERS EVENLY AND UNIFORMLY TO
PREVENT LEAKS.
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
© 2018 Avco Corporation. All Rights Reserved
November 2018