Cessna 150M - Page 146

11-10. REMOVAL. If the engine is to be placed in
storage or returned to the manufacturer for overhaul,
proper preparatory steps should be taken prior to
beginning the removal procedure. Refer to Indefinite
Storage in Section 2 for preparation of the engine for
storage. The following engine removal procedure is
based upon the engine being removed from the air-
craft with the engine mount attached to the firewall
and all engine hose and lines being disconnected at
the firewall. The reason for engine removal will
determine where components are to be disconnected.
NOTE
Tag each item disconnected to aid in identify-
ing wires, hose, lines and control linkage
when engine is being installed. Protect open-
ings, exposed as a result of removing or dis-
connecting units, against entry of foreign ma-
terial by installing covers or sealing with tape.
a. Place all cabin switches and fuel valves in the
OFF pOSition.
b. Remove engine cowlings. (See paragraph 11-3. )
c. Open battery circuit by disconnecting battery
cable(s) at the battery. Insulate cable terminal(s)
as a safety precaution.
d. Disconnect ignition switch primary ("P") leads
at the magnetos.
IWARNING'
The magneto is in a SWITCH ON condition
when the switch wire is disconnected.
Ground the magneto pOints or remove the
high tension outlet plate from the magneto
or disconnect spark plug lead wires at
spark plugs to prevent accidental firing
when the propeller is rotated.
e. Drain engine oil from sump.
f. Remove propeller and spinner. (See Section
13.)
NOTE
During the following procedures, remove
any clamps which secure controls, wires,
hose, or lines to the engine, engine mount,
or attached brackets, so that they will not
interfere with removal of the engine. Omit
any of the items which are not present on a
particular engine installation.
g. Disconnect throttle and mixture control at car-
buretor. Pull these controls free of engine and en-
gine mount, using care not to damage them by bend-
ing too sharply. Note position, size and number of
attaching washers and spacers.
h. Disconnect carburetor heat control from arm on
carburetor air intake housing assembly. Remove
clamps and pull control aft clear of the engine.
i. Disconnect wires and cables as follows:
11-8
ICAUTION\
When disconnecting starter cable, do not
permit starter terminal bolt to rotate.
Rotation of the bolt could break the conduc-
tor between terminal and field coils causing
the starter to be inoperative.
1. Starter electrical cable at starter.
2. Electrical wires and wire shielding ground
at alternator.
3. Tachometer drive shaft at adapter on engine.
4. Remove all clamps attaching wires and
cables to the engine or engine mount. Pull all wires
and cables aft to clear the engine.
j. Disconnect and cap or plug lines and hose as
follows:
1. Vacuum hose at firewall.
IWARNING'
Residual fuel and oil draining from dis-
connected lines and hose is a fire hazard.
Use care to prevent accumulation of such
fuel and oil when lines or hose are dis-
connected.
2. Oil pressure hose at firewall.
3. Oil temperature bulb at engine.
4. Primer line to engine at firewall.
5. Fuel hose to engine at fuel strainer on
firewall.
6. Remove all clamps attaching lines and hose
to engine or engine mount which interferes with en-
gine removal from engine mount.
ICAUTION\
Attach a tail stand to the tail tie-down fitting
before removing the engine. The loss of
engine weight will allow the tail to drop. Do
not
raise engine higher than necessary when
removing engine-to-mount bolts. Raising
the engine too high places a strain on the
attach bolts and hinders their removal.
k. Attach a hoist to the lifting lug on top of the en-
gine and take up engine weight on hoist.
1. Remove bolts attaching engine-to-mount. Note
direction of bolt installation and position and num-
bers of washers. Balance the engine by hand as the
last of the bolts are removed. Remove ground straps
at lower mount legs as bolts are removed.
iCAUTION\
Hoist engine slowly and ascertain that all
items attaching engine and accessories to
engine mount and airframe are disconnect-
ed.
m. Carefully guide disconnected components out of
engine assembly.