Piper Arrow IV Turbo Maintenance Manual page 692

4. Place turbine housing insulation blanket in proper position and safety blanket to turbocharger attaching
hardware.
5. Position the exhaust tailpipe and exhaust bypass screw to the turbine outlet, aligning the tailpipe with
the hole cut out in the lower cowl provided for it.
Check the position of the exhaust bypass adjustment screw. If 8
minimum, 9 maximum threads are showing, below jam nut no
adjustment is required.
6. Tighten both turbine housing inlet clamps. (Refer to above note on tightening V-band clamps).
7. Position the engine induction tube to turbocharger compressor outlet connector and the induction air
inlet tube to the turbocharger compressor inlet connector in their proper locations and tighten the clamps.
8. Connect the oil supply and return lines to the turbocharger center housing. Connect the oil pressure
cockpit gauge line if it was previously disconnected.
9. Perform engine ground run-up and check for normal engine functioning, excessive exhaust manifold
leakage and oil leaks. Repair as necessary.
10. Install the upper cowling.
ADJUSTMENT OF TURBOCHARGER.
A complete inspection of the power plant system should be
performed before any turbo adjustments are made.
Refer to "Engine Setup Procedures", Chapter 73, for adjustment procedure.
OVERBOOST VALVE.
REMOVAL OF OVERBOOST VALVE.
1. Remove the four self-locking nuts, plain washers and bolts.
2. Lift the overboost valve assembly from the induction tube.
3. Remove the O-ring from the seating surface of the overboost mounting flange on the induction tube.
INSTALLATION OF OVERBOOST VALVE.
1. Install a new O-ring on the overboost mounting flange of the induction tube.
2. Position the overboost valve assembly on the mounting flange with the holes in the valve aligning with
the holes in the flange.
3. Install the four bolts and secure with plain washers and self-locking nuts.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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3H5
81-20-06
Page 81-03
Revised: July 24, 1981