Starting

TTP	B1-L3	ATA80
Cessna 172	B2-L1

Starter -  Direct drive 24 VDC starter mounted at the front (propeller end) lower left side of the engine. The ignition key in the instrument panel operates the starter solenoid. When the solenoid is operated, its contacts close and a electrical current energizes the starter. A pinion gear in the starter engages the crankshaft ring gear. When the engine reaches a given speed, centrifugal action decouples the starter pinion from the crankshaft ring gear.


801001 Starter and Electrical Connections - Check security and condition of starter,                           electrical connection, and cable. B 05-12-02 120
801002 Bendix Drive Starter Assembly - Clean and
             lubricate starter drive assembly.

Starter Removal 
(1) Remove the upper and lower engine cowling. 
(2) Disconnect the negative terminal from the battery.
(3) Remove the screws securing the left front baffle to the engine assembly.
(4) Remove the baffle from the engine.
(5) Disconnect the large electrical wire which is the positive lead, at the starter.
(6) Cut and discard the safety wire to the bolt securing the alternator attach bracket to the starter.
(7) Remove the bolt that attaches the alternator attach bracket to the starter. If necessary, loosen the alternator belt.
(8) Remove the one bolt and three nuts that attach the starter to the crankcase and remove the starter from the engine.
Installation
(1) With the one bolt and three nuts, attach the starter to the engine crankcase. Step torque the fasteners diagonally.
(a) On Sky-Tec starters, torque the bolt and nuts to 204 inch-pounds.
(2) Attach the alternator attach bracket to the starter with the bolt and torque.
(a) On Sky-Tec starters, torque the bolt to 204 inch-pounds.
(3) If necessary, reset the alternator belt tension.
(4) Safety wire the bolt to the attach bracket .
(5) Connect the positive lead to the starter. Make sure the protective boot fully covers the power terminal stud on the starter.
(a) On Sky-Tec starters, torque the nut on the power terminal stud to 50 inch-pounds, +5 or -5 inch-pounds.
              NOTE: Sky-Tec starters have a metric nut on the power terminal stud.
(6) On Sky-Tec starters, use high-temperature tie straps and connector to attach the positive lead to the starter.
(7) Attach the left front baffle to the engine assembly.
(8) Attach the negative terminal to the battery.
(9) Install the upper and lower engine cowling.
3. Bendix Drive Starter Assembly Cleaning And Lubrication
A. Clean the Bendix starter drive assembly
CAUTION: Use only a clean petroleum spirit. Do not use any other type of solvent.
(1) Clean the starter drive with a clean petroleum spirit.
B. Lubricate the starter drive assembly.
CAUTION: Do not use grease, oil or graphite lubricants. Use only silicone spray lubricants which are recommended for correct operation.
(1) Lubricate the Bendix starter drive assembly with a silicone spray such as Crown Industrial Products silicone spray 8034.