Piper COMANCHE PA-24-180 Service Manual page 339

PIPER COMANCHE SERVICE MANUAL
This relief sal\e regulates the engine oil pressure by allowing excessi\e oil to return to the sump. while
the balance of the pressure oil is fed to the main oil gallery in the right half of the crankcase Residual oil is
returned b! gravity to the sump where. after passing through a screen. it is again circulated through the
engine
7A-3. Troubleshooting. Troubles peculiar to the power plant are listed in Table VIIA-III in the back ol
this section. along with their probable causes and suggested remedies. When troubleshooting engines.
ground the magneto primary circuit before performing any checks on the ignition system
7A-4 Engine Cowling.
7A-5. Removal Of Engine Cowling. (PA-24-250 and PA-24-260. Serial Nos 24-1 to 24-4782 inc . and
244784 to 24-4803 mci.)
a
Ascertain that the master switch and mag ,o switches are in the OFF position
b.
Release the three cowl fasteners on each side of the engine compartment
c
Remove attaching screws from the top cowl at the firewall and nose cowl
d
Disconnect cowl attachment straps from top cowl.
e
Remove the two attaching nuts. washers and screw securing the top cowl channel to firewall
f Lift the top cowl from the engine assembly
g Disconnect the air bellows from air filter by loosening the quarter turn fasteners
h Disconnect all drains and holes attached to the bottom cowl
Disconnect the two support tubes from the bottom cowl
j Disconnect the nose gear door retraction rod at the nose gear strut
k
Remove attaching screws from bottom cowl by pulling down and forward
7A-6 Cleaning. Inspection And Repair Of Engine Cowling.
a
Clean cowling with a suitable cleaning solvent and wipe dr\ with a clean cloth
b Inspect cowling for dents. cracks. loose risets. elongated holes and damaged or missing fasteners
c
Repair all defects to present further damage.
7A-7 Installation Of Engine Cowling. (PA-24-250 and PA-24-260. Serial No\ 24-1 to 24-472 incl . and
244784 to 24-4803 ncl )
a
Position the lower cowling and secure with screws to the firewall bulkhead
b Attach the two support tubes to the aft section of the lower cowlhng.
c.
Attach the nose gear door retraction rod to the gear strut.
d
Connect air hoses and drain lines to the bottom cowling
e
Attach the carburetor air bellows to the air filter with quarter turn fasteners
f
Position the top cowl on the nose section and secure the two cowl channels to the firewall with
screws, washers and nuts.
g
Secure the top cowling to the firewall bulkhead and nose section with screws
h Attach the top cowl hold down straps to each cowl support channel
ISSt ED: 8/18/72
2C5
POWER PLANT
2C5