Transcript Starter Service

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BATTERY
CABLES AND WIRING
IGNITION SWITCH
NEUTRAL SAFETY SWITCH
STARTER RELAY/SOLENOID
STARTER MOTOR
TROUBLESHOOTING
• Problems fall into Four
categories
– No Crank
– Slow Crank
– Starter spins but does not engage
– Excessive noise
PROCEDURES
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VERIFY PROBLEM
DEVELOP CONSISTENT METHOD
PERFORM VISUAL INSPECTION
CHECK BATTERY PERFORMANCE
VERIFY ENGINE CONDITION IF NO
CRANK OR SLOW CRANK
• (BE CAUTIOUS!)
TROUBLE CHARTS
• FIND NORMAL AMPERAGE
STARTER DRAW SPECS.
• BY SYMPTOM, CAN SOMETIMES
DIAGNOSE PROBLEM IN STARTING
SYSTEM
• TESTING EQUIPMENT MUST BE
ACCURATE
QUICK TEST
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TURN HEADLIGHTS ON
CRANK ENGINE
NOTE RESULTS
DON’T OVERCRANK ENGINE
CURRENT DRAW TEST
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DISABLE IGNITION
VISUAL INSPECT
HOOK UP EQUIPMENT
TURN OFF ALL ELECTRICAL LOADS
PERFORM TEST
CURRENT DRAW TEST
• VOLTAGE SHOULD NOT GO BELOW
10 VOLTS
• AMPERAGE SHOULD BE ABOUT
• 4 CYL. 125-150
• 6 CYL. 140-160
• 8 CYL. 160-200 small block
• 8 CYL. 200-240 large block
CURRENT DRAW TEST
VOLTAGE DROP TEST
• A CIRCUIT
RESISTANCE TEST IS
ALSO CALLED A
VOLTAGE DROP
TEST
• YOU HAVE TO TEST
BOTH THE POSITIVE
AND THE NEGATIVE
SIDES
VOLTAGE DROP TEST
INSULATED CIRCUIT
• VOLTMETER ON LOW
SCALE
• HOOK UP EQUIPMENT
• CRANK ENGINE
• NOTE VOLTAGE
• LESS THAN 0.5 VOLT
• ALSO CALLED A
INSULATED CIRCUIT
RESISTANCE TEST
VOLTAGE DROP INSULATED CIRCUIT
LAB 164
VOLTAGE DROP GROUND
CIRCUIT
• SELECT LOW
SCALE
• HOOK UP
EQUIPMENT
• CRANK
ENGINE
• NOTE RESULTS
• LESS THAN
0.2V VOLTAGE
DROP
VOLTAGE DROP GROUND CIRCUIT
SOLENOID CIRCUIT TEST
• DISABLE IGNITION
• LOW VOLT SCALE
• CONNECT ACROSS
SOLENOID
• CRANK ENGINE
• VOLTAGE LESS
THAN 0.2 VOLT
SOLENOID CIRCUIT TEST
FREE SPEED TEST
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TESTS STARTER FREE LOAD
AMPS
RPM
CAUTION!
COMPARE RESULTS TO SPECS
Bench testing a starter
STARTER R & R
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DISCONNECT BATTERY!
IDENTIFY WIRES
PAY ATTENTION TO SHIMS, ETC.
ADJUST DRIVE GEAR CLEARANCE
RE-CHECK OPERATION
THE END