Download Systems Repair Worksheet

Systems Repair Worksheet Chapter 18
Starting & Traction Motor Systems
Pages 537-570
Name
62 Points
Due Date
1. Electric _________ are used to start the engine & in hybrids are used to move the vehicle. Motors
are also used to operate many different accessories requiring either linear or rotary motion.
2. Starter motors & accessory motors use ___ voltage while traction or drive motors use ___voltage.
3. ____________ & ___________ are closely related because one can be used to create the other.
4. __________ flow through a wire creates a magnetic field & moving a _____ through a magnetic
field creates current flow in the wire. Coils or loops of wire just intensify that effect.
5. A magnetic field called, called a ________ ________, exists around every magnet.
6. Temporary magnets (armatures) are made of _______ iron. Permanent magnets require hard iron.
7. The resistance that a material offers to passage of magnetic flux lines is called ______________.
8. Air has ________ reluctance. Soft iron cores & armatures have ________ reluctance.
9. An electric motor converts ____________ energy into ____________ energy.
10. Basic components of a motor are the stator or _______ windings, & the rotor or ____________.
11. Either the field windings or the armature can be made of _____________ magnets, but not both.
12. Starter motors are designed to operate under great ______________ for short periods of time.
13. The starter frame holds the stationary _______ coils (flat copper) & their _______ shoes (soft iron).
14. The ____________ is the rotating part of the starter, made up of windings and the commutator.
15. Starter ________ connect the armature & the field coils in either a series or parallel arrangement.
16. ____________ magnetic fields cause the motor armature to rotate.
17. _____________ magnet starter motors may have a planetary gear reduction to increase torque.
18. The slower the motor turns, the ______ current it will draw.
Maximum current is drawn when it engaged, but the armature is not rotating.
19. The starting system has 2 distinct circuits: 1) the ________________ (motor feed-high amps)
circuit, and 2) the ______________ (low amps-switching) circuit.
20. The motor feed circuit contains the battery & cables, the ______________, & the starter motor.
21. The control circuit contains the ___________ switch, starting ________ switch, a ________
or a solenoid (to use low amps to control higher amps), the battery, fuses, and normal-gauge wiring.
22. The __________ plunger is used to move the starter pinion gear & its contacts serve as a relay
switch to energize the motor once the drive pinion engages the flywheel/flex plate ring gear.
23. A starter ______ is similar to a solenoid, switches high current using low current,
but does not pull-in a plunger to actuate a starter drive.
24. A movable ______ ______ starter does not use a starter motor mounted solenoid.
25. To prevent the pinion gear from driving the armature at engine speed an
_____________ clutch is built into the starter drive mechanism.
26. Starter drive-to-ring gear ratio is a gear reduction to provide a torque increase.
True
False
27. The starting safety switch allows the control circuit to be energized only if the automatic trans is
in either the ________ or __________ position and only if the manual transmission has the
clutch pedal fully pushed to the floor to disengage the transmission from the engine.
28. Perform a ______________ load test before performing any starting system tests.
Note: Loose or dirty connections will cause excessive voltage drops in the motor feed circuit.
29. Battery volts should not drop below _____ volts during the 15 seconds of cranking voltage test.
30. Cranking current (amperage) should be between 100-250 amps for most gas engines.
True
False
31. A voltage drop test of both the ____________ side and the ground side (- to -) of the motor feed
circuit should show between 0.2 to 0.6 volts if the battery/starter cables are in good condition.
32. Starter solenoids can be by-passed or jumped to verify their condition.
33. Ignition switches can be by-passed or jumped to verify their condition.
True
True
False
False
34. Even the low amps, control circuit can be __________ ______ (+ to +) tested during cranking to
determine the condition (resistance) of the wiring. Good, low amps circuits should be under 0.2 VD.
35. A starter no-load or free speed bench test can be low on RPM’s if a pole ______ drags against the
armature. This could be caused by either a loose shoe or by worn drive-end & brush-end bushings.
36. When testing an armature with a growler, a vibrating strap indicates a ___________ armature,
continuity from commutator bars to the armature frame indicates a prematurely grounded motor,
and no continuity from commutator bar to commutator bar indicates an ______ condition which
will result in “dead spots” during cranking.
37. _________ should be of the proper length, commutator bars should be smooth, and the mica
strips of insulation between the commutator bars should be properly undercut to a uniform depth.
38. Starter drive __________ on the armature shaft and both armature __________ should be
lightly lubricated with high temperature grease during rebuilding procedures.
39. In the space below, wire-up a cranking circuit that uses a remotely mounted starter solenoid.
(include: battery, grounds, fuse, P/N switch, ignition switch, solenoid, starter motor)
40. In the space below, wire-up a cranking circuit that uses both a starter relay and a starter solenoid.
(include: battery, grounds, fuse, P/N switch, ignition switch, relay, solenoid, starter motor)
41. On the top circuit, draw in a DMM connected for a battery ground cable voltage drop test.
42. On the top circuit draw in a DMM connected for an open circuit voltage test of the battery.
43. On the bottom circuit, draw in a DMM connected for a battery positive cable voltage drop test.
44. On the bottom circuit draw in a DMM inductively connected for a cranking current draw test.