Turbocharger Lubrication System Priming; Installation Of Turbocharger - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
2. Disconnect the air duct from the compressor inlet and the exhaust from the turbine
discharge.
3. Disconnect the support rods connecting the turbo and engine.
4. Loosen the upper clamp of the hose that connects the turbo compressor and injector inlet
plenum.
5.
Remove the bolts that attach the turbo to the mounting pad on the exhaust plenum and
remove the turbo from the airplane.
c. The injector inlet plenum may be removed by the following procedure:
1. Remove the lines to the lower portion of the plenum, the density controller and the
pressure-ratio controller.
2. Loosen the clamp on the hose that connects the plenum to the injector. If not previously
accomplished in step b, loosen the clamp on the hose that connects plenum and compressor.
3. Move the plenum aft and down to remove from the airplane.
d. The exhaust by-pass valve may be removed by the following procedure: (Refer to the latest revision
of Lycoming Service Bulletin No. 450 or Airesearch Service Bulletin No. TP60-0119.)
1. Ascertain that the exhaust by-pass valve is removed according to Step d.
2. Disconnect and remove the left exhaust stack extension by disconnecting it from the
exhaust stack and the bracket that is attached to the turbo mounting bracket. Slide the extension from the
exhaust plenum.
3. Disconnect the plenum from the main mounting bracket. If not previously accomplished in
Step a, disconnect the plenum from the turbo.
4. Remove the plenum from the right exhaust extension and from the airplane.
f. For service maintenance and overhaul of the turbocharger, refer to the manufacturer's
recommended instructions.
1. Remove the tailpipe assembly by disconnecting it at the exhaust plenum and the turbine
discharge.
2. Disconnect the lines from the by-pass valve actuator.
3. Disconnect the by-pass valve from the exhaust plenum.
e. The exhaust plenum may be removed by the following procedure:
8-36. TURBOCHARGER LUBRICATION SYSTEM PRIMING. Immediately prior to mounting the unit.
prime the lubrication system as follows:
a. Invert turbocharger and fill center housing with new clean engine oil through oil drain.
b. Turn rotating assembly by hand to coat bearings and thrust washer with oil.
c. Coat threads of attaching bolts or studs with high temperature thread lubricant.
d. After installing turbocharger, flush oil through oil inlet line and ensure that line is clean and un-
obstructed.
e. Fill engine and oil inlet line with new, clean lubricating oil, and connect line.
f. Connect oil return line. (Refer to latest copy of Lycoming Service Instruction No. 1241.)
NOTE
If the turbocharger is to be installed on a new or newly overhauled
engine, operate the engine with a separate oil filter in the oil supply
line to the turbocharger during the first hour of operation. This must
be done to ensure that no metal particles are carried from the engine
into the turbocharger lubrication system.
8-37. INSTALLATION OF TURBOCHARGER.
a.
The exhaust plenum may be installed by the following procedure:
1. Slide the plenum on the right exhaust extension and secure it to the main mounting bracket.
If the turbo is in place, secure to the turbo.
Revised: 3/11/81
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