Piper Navajo PA-31 Service Manual page 484

PIPER NAVAJO SERVICE MANUAL
NOTE
For all "V" band couplings on the exhaust system, be sure parts
are concentric before tightening coupling. Coupling will not center
parts automatically.
b. The exhaust by-pass valve may be installed by the following procedure:
1.
Attach and secure the by-pass valve to the exhaust plenum. A gasket is installed between the
by-pass valve and exhaust plenum.
2. Connect the lines to the by-pass actuator.
3.
Connect the tailpipe assembly to the by-pass valve and the turbine discharge. A gasket is
installed between the by-pass valve and tailpipe assembly.
c. The injector inlet plenum may be installed by the following procedure:
1. If the turbo is installed, connect the plenum to the compressor outlet with hose and clamps.
2.
Connect the lower portion of the plenum to the injector with hose and secure clamps.
3. Connect the air duct to the compressor inlet and the exhaust to the turbine discharge.
4. Connect the oil supply and return lines to the center section of the turbo.
d. Install the engine cowling. (Refer to Paragraph 8-6.)
8-33. ADJUSTMENT
OF TURBOCHARGER.
It is recommended that adjustments of the turbocharger
be conducted by an authorized overhaul facility, in accordance with the latest revision of Avco-Lycoming
Service Instruction No. 1187.
8-33a. DENSITY CONTROLLER.
8-33b. REMOVAL OF DENSITY CONTROLLER.
a.
Remove engine cowling. (Refer to Paragraph 8-4.)
b. Disconnect oil lines at controller unit.
c. Remove the bolts securing the controller to the compressor discharge housing.
d. Remove the controller from the engine compartment.
8-33c. INSPECTION AND REPAIR OF DENSITY CONTROLLER.
Refer to the latest revision of Garrett Airesearch Publication No. TP21-0108.
8-33d. INSTALLATION OF DENSITY CONTROLLER.
a. Ascertain that all oil inlet and outlet lines are clean.
b.
Mount the controller on the compressor discharge housing and secure with mounting bolts.
c. Reconnect inlet and outlet oil lines to the controller.
8-33e. ADJUSTMENT OF DENSITY CONTROLLER.
Refer to the latest revision of Avco-Lycoming Service Instruction No. 1187 for adjustment procedures. A
list of special tools required to accomplish this adjustment is included in the Service Instructions.
8-33f. DIFFERENTIAL
PRESSURE CONTROLLER.
8-33g. REMOVAL OF DIFFERENTIAL
PRESSURE CONTROLLER.
a.
Remove engine cowling. (Refer to Paragraph 8-4.)
b. Disconnect oil lines from controller.
c. Remove mounting bolts securing controller to the compressor discharge housing.
d. Remove the controller from the engine.
8-33h. INSPECTION AND REPAIR OF DIFFERENTIAL PRESSURE CONTROLLER.
Refer to the latest revision of Garrett Airesearch Publication No. TP21-019 for detailed information.
Revised: 9/24/81
2110
POWER PLANT