Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1533 / 1956

PAGE 1
Feb 28/07 7K15
81-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
TURBO-SUPERCHARGER
1. Turbocharger System
A. Description
This chapter contains information on the removal, installation and adjustment of the various
components of the turbocharging and exhaust system.
The Lycoming TIO-540-AE2A engine is equipped with dual AiResearch (Garret) turbochargers, one
on each side of the engine. Each turbocharger extracts exhaust energy from its respective bank of
cylinders to pressurize the induction air.
Air is taken from the induction inlet louvers into the induction air box. Here it is filtered and divided
for distribution to the left and right turbocharger compressors. The compressed air then flows
through an aftercooler where its air temperature is reduced. Downstream from the aftercoolers, the
air flows join at the Y junction of the intake tubes, then passes through the throttle butterfly valve
and is divided to individual intake pipes to each cylinder.
Metered fuel is injected into the cylinder head upstream of the intake valve. After combustion in the
cylinder, exhaust gases flow into the exhaust manifold, to the turbocharger turbines where exhaust
energy is extracted to drive the turbines which, in turn, drives or turns the compressor.
B. Troubleshooting
See Chart 1.
2. Turbocharger Pre - Lubrication
Following engine oil and filter changes, and following any prolonged period of non-operation, pre -
lubricate the turbochargers as follows:
A. Temporarily disconnect the engine oil supply lines from the turbocharger oil inlet ports and the
engine air duct from the compressor housing inlets.
B. Fill the turbocharger oil inlet ports with clean engine oil and manually turn the compressor wheels
several revolutions to coat all journal and bearing surfaces with oil. Reconnect the air ducts.
C. Place suitable containers under the disconnected engine oil supply lines to avoid spilling oil on the
engine.
D. Crank the engine, without allowing it to start.
E. When a steady flow of oil is obtained from the supply lines to show that air has been purged from
the system, stop cranking. Reconnect the oil supply lines.