Cessna 150 Series Service Manual page 133

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