Piper PA-24 Comanche Service Manual page 337

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PIPER COMANCHE SER\'ICE
MA~rAL
This relief valve regulate" the engine oil pressure by allowing excessive 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 nil i...
returned
b~ gra\it~
to
the sump where, after passing through a screen. it is again circulated through
the
eng me.
7.Ar.~).
Troubleshooting. Troubles peculiar to the power plant are listed in Table \'IIA·III in the back
Ilf
this section. along with their probable causes and suggested remedies. When troubleshooting cngmc«.
ground t he magneto primary circuit before performing any checks on the ignition
s~
...tern.
:A-4. Engine Cowling.
'A-5. Removal Of Engine Cowling.
(PA·24-~50
and
PA~24-260.
Serial 'as. 24-1
to
24...nH2 incl.. and
~4-nH4 to 24~4HO)
incl.)
a. Ascertain that the master switch and magneto switches are in the OFF position.
b. Release the three cowl fasteners on each side of the engine compartment.
c. Remme attaching screws from the top cowl at the firewall and nose cowl.
d. Disconnect cowl attachment straps from top cowl.
e. Remme 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. Di ...connect all drains and holes attached to the bottom cowl.
I.
Disconnect the two support tubes from the bottom cowl.
.1.
Disconnect the nose gear door retraction rod at the nose gear strut.
k. Remove attaching screws from bottom cowl by pulling down and forward .
.. A·6. Cleaning. Inspection And Repair Of Engine Cowling.
a. Clean cowling with a suitable cleaning solvent and wipe dry with a clean cloth.
b. In... pect cowling for dents. cracks. loose rivets. elongated holes and damaged or missing fastener".
c. Repair all defects to prevent further damage.
7A~7.
Installation Of Engine Cowling. (PA-24-250 and PA-24-260. Serial \os. 24-1 to 24-47lS2 incl.. and
24-4":'l'\4 to 14-4XO) incl.]
a.
Po-irion the lower cowling and secure with screws to the firewall bulkhead.
h. Attach the two support tubes to the aft section of the lower cowling.
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.
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ISSl'ED: 8/18/72
2C5
POWER Pl..\'T