Piper COMANCHE PA-24-180 Service Manual page 454

k. Connect turbocharger outlet stack brace.
I. Connect waste gate control cable and clamp to turbocharger outlet stack.
m. Adjust control cable rod so swaged area is recessed into cable attachment clamp with waste gate in
the closed position.
n. Connect compressor outlet and inlet ducts and secure with clamps. When installing the right
turbocharger, position air plenum on turbocharger and secure to compressor inlet with clamp and to
turbocharger lug with bolt, washer and nut. Connect inlet and outlet air ducts to air plenum and secure with
clamps.
o. Adjust turbochargers to engine. (Refer to paragraph 7C-25.)
p. Retorque and lockwire all V-band clamps after run in. (See Figure 7C-5a)
q. Install engine cowling. (Refer to paragraph 7C-7.)
MS 20995-C41 WIRE
T-BOLT
Figure 7C-5a. Lockwiring V-Band Couplings
7C-25. Adjustment of Turbochargers.
a. Remove bottom engine cowl.
b. Adjust waste gate control cable rods so both waste gates close at the same time and swaged area is
recessed into cable attachment clamp.
c. Start engine with turbochargers "off' and allow engines to warm up.
d. Run engine at full throttle (2700 RPM) and advance Turbocharger control lever until manifold
pressure reads one half inch of mercury Less than the field barometric pressure.
e. Stop engine.
f. Without moving the waste gate control cable adjust the control lever back to its stop.
g. Safety all control cable connections and install quadrant trim panel.
h. Install bottom engine cowl.
7C-26. Overboost Pressure Relief Valve. The overboost pressure relief valve senses deck pressure directly
against the valve face which is held in a closed position by action of the conical spring and aneroid bellows.
The valve face will remain seated under all conditions of normal deck manifold pressures. In the event that
overboost does occur. The relief valve will not permit deck pressure and thereby manifold pressure to build
up to more than 3.5" HgA in excess of normal maximum allowable pressures.
7C-27. Removal of Pressure Relief Valve.
a. Remove bottom engine cowl. (Refer to paragraph 7C-5.)
b. Remove bolts securing relief valve to compressor discharge box.
c. Cap compressor discharge box to prevent contamination.
7C-28. Cleaning and Inspection of Pressure Relief Valve.
a. Clean valve and seat areas with solvent or air.
b. Inspect valve action by pushing on pressure side, to determine that bellows or spring are not
restricted
c. Inspect valve and seat for wear or damage.
d. Inspect "0" ring gasket for damage or deterioration.
POWER PLANT
Revised: 8/15/98
PA-24-260 TURBO
PIPER COMANCHE SERVICE MANUAL
2G24