REMOVAL AND REPLACEMENT.
Refer to the General section of Chapter 77 for Removal of cluster mounted instruments.
OIL TEMPERATURE GAUGE CALIBRATION.
A calibration chart has been included for use in verifing that the suspected faulty gauge is within tolerance. Actual recalibration of the gauge must be performed by the manufacturer or an approved instrument repair facility.
1.
With the instrument installed in the aircraft, the aircraft's power connected (14 VDC) and the ground connected.
2.
Remove the connection to the terminal marked SEND and connect a specified amount of resistance as indicated on the chart, by use of a fixed resistor or a test unit capable of simulating the resistance indicated on the chart (Power Resistor Decade Box).
79-30-00 Page 79-9 Issued: April 1, 1997
OIL TEMPERATURE GAUGE CALIBRATION (cont)
3.
If the gauge does not meet the tolerances set forth in the chart, it must be replaced or recalibrated.
4.
Reinstallation should be the reverse of the procedure used to disconnect it.
— Note — To facilitate installation, mark or label all wires prior to removal.
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CHAPTER
80
STARTING
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CHAPTER 80 - STARTING
TABLE OF CONTENTS / EFFECTIVITY
CHAPTER/ SECTION SUBJECT GRID NO. EFFECTIVITY
80-00-00 GENERAL 3K5
Description Troubleshooting 3K5 3K5
80-10-00 CRANKING 3K9 1R0202
Maintenance of Starting System 3K9
Overhaul of Starting Motor Removal of Starting Motor Disassembly of Starting Motor Brushes Armature Field Coils Brush Holders Gear and Pinion Housing Bendix Drive Assembly of Starting Motor 3K10 3K10 3K10 3K10 3K11 3K11 3K11 3K11 3K11 3K13
Bench Tests Starting Motor Control Circuit Starting Motor Service Test Specifications 3K13 3K13 3K14 1R0202
80-Cont./Effec. Page 80-3 Revised: February 28, 2002
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80-Cont./Effec. Page 80-4 Issued: April 1, 1997
3K4
GENERAL.
DESCRIPTION.
The gear reduction starting motor consists of six major components: The Commutator End Head Assembly, the Armature, the Frame and Field Assembly, the Gear Housing, the Pinion Housing, and the Bendix Drive Assembly.
When the starting circuit is energized, battery current is applied to the starting motor terminal. Current flows through the field coils, creating a strong magnetic field. At the same time, current flows through the brushes to the commutator, through the armature windings to ground. The magnetic force created in the armature combined with that created in the field windings begins to turn the armature.
The gear cut on the drive end of the armature shaft extends through the gear housing, where it is supported by a roller bearing. The gear mates with the teeth of the reduction gear that drives the bendix shaft. The shaft is keyed to the reduction gear. The Bendix drive is held in position on the shaft by a “spiral” pin. The shaft is supported in the gear housing by a closed end roller bearing and in the pinion housing by a graphitized bronze bearing.
When the armature turns the reduction gear, the Bendix drive pinion meshes with the flywheel ring gear by inertia and action of the screw threads within the Bendix sleeve. A detent pin engages in a notch in the screw threads which prevents demeshing if the engine fails to start when the starting circuit is de-energized.
When the engine reaches a predetermined speed, centrifugal action forces the detent pin out of the notch in the screw shaft and allows the pinion to demesh from the flywheel.
TROUBLESHOOTING.
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