Cessna 150M - Page 163

employs an electric starter motor mounted at the
rear of the accessory housing. A starter solenoid is
activated by the ignition key on the instrument panel.
When the solenoid is activated, its contacts close and
11-57. TROUBLE SHOOTING.
electrical current energizes the starter motor. Ini-
tial rotation of the starter motor engages the starter
through an overrunning clutch in the starter adapter.
TROUBLE
PROBABLE CAUSE
REMEDY
STARTER WILL NOT OPERATE.
Defective master switch or
Install new sWitch or wires.
circuit.
Defective starter switch or
Install new switch or wire!;.
switch circuit.
Defective starter motor.
Remove, repair or install new
starter motor.
STARTER MOTOR RUNS, BUT
Defective overrunning clutch
Install new starter adapter.
DOES NOT TURN CRANK-
or drive.
SHAFT.
Starter motor shaft broken.
Install new starter motor.
STARTER MOTOR DRAGS.
Low battery.
Charge or install new battery.
Starter switch or relay contacts Install serviceable unit.
burned or dirty.
Defective starter motor
Install new cable.
power cable.
Loose or dirty connections.
Remove, clean and tighten all
terminal connections.
Defective starter motor.
Check starter motor brushes,
bruch spring tension, thrown
solder on brush cover. Repair
or install new starter motor.
Dirty or worn commutator.
Clean and turn commutator.
11- 58. REMOVAL AND INSTALLATION.
b.
Disconnect starter power cable at starter. In-
sulate terminal on power cable to prevent accidental
shorting.
a. Remove cowling as required for access.
When disconnecting or connecting the starter
cable1do not permit starter terminal bolt to
rotate. Rotation of the terminal bolt could
break the conductor between terminal and
field coils causing the starter motor to be
inoperative.
c. Remove three Palnuts and three hex head nuts
attaching starter adapter to crankcase cover studs.
d. Cut safety wire and remove two bolts threaded
through crankcase into starter.
e. Tap starter gently to loosen gasket and remove
starter and adapter with a straight rearward move-
ment.
f. Clean any gasket which may be stuck to starter,
starter adapter, or crankcase cover.
Change 1
11-23