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© Unitec New Zealand 1 Faulty Starting System Symptoms No Cranking Slow Cranking Abnormal Noise Overheating of Cables
© Unitec New Zealand 2 Engine does not crank (Solenoid or relay does not click) Dead battery Loose, corroded or broken connections Corroded battery terminals (lights will usually light) Faulty ignition switch Faulty neutral safety switch or clutch switch (To test: push on brake pedal, hold key in start position and move shift lever or clutch pedal) Defective starter switch, relay or solenoid.
© Unitec New Zealand 3 Engine will not crank (Solenoid or relay clicks) Low or "dead" battery Corroded battery terminals or cables Defective starter solenoid or relay Defective starter motor (if current is passed through relay or solenoid)
© Unitec New Zealand 4 Starter motor cranks slowly Low battery Loose, corroded or broken connections Cable size too small Internal starter motor problems Engine oil too heavy Ignition timing too far advanced
© Unitec New Zealand 5 Starter spins, but will not crank engine Broken starter drive gear Broken flywheel teeth Noisy starter motor Starter mounting loose Worn starter drive gear or flywheel teeth Worn starter bushings
© Unitec New Zealand 6 On Vehicle Testing Cranking speed Cranking Voltage- should be > 9.6V Voltage Drop is indication of excessive résistance, loose or dirty contacts Should be < 0.25 to 0.5V Current Draw – 4 cylinder engine 125-175 A max.
© Unitec New Zealand 7 Current Draw Test No Current draw – open circuit High current draw –Short circuits –Poling –Tight bushes –Insufficient thrust clearance –Engine not turning freely Low current draw –High resistance –Burnt solenoid contacts –Dirty/ burnt commutator and brushes
© Unitec New Zealand 8 Starter Tests off Vehicle Bench Test- no special tester needed Lock Torque or Stall Test- normally carried out after an overhaul
© Unitec New Zealand 9 Bushes and Bearing Check and Inspect Poling – armature rubbing on the pole shoes Bushes- for excessive Bearings – roughness and bumpiness (reduction gear type) New bushes should be immersed in oil for one hour
© Unitec New Zealand 10 Brushes and Bush holder Measure brush length – it should be within the specifications Check for sticky brush ( in its holder) Check brush spring tension Positive brushes must be insulated –Infinity reading with the brush holder and brush plate
Positive Brushes must be insulated © Unitec New Zealand 11
Measure Brush length © Unitec New Zealand 12
© Unitec New Zealand 13 Solenoid test Use half the rated voltage Pull in test –Connect battery power to terminal S and M –Plunger should pull in Hold in test –Push the plunger in –Connect battery power to terminals S and solenoid body –Release the plunger and it should remain held. Return Test –Plunger should return to normal position once the power is disconnected
Hold in Test © Unitec New Zealand 14
Pull In Test © Unitec New Zealand 15
© Unitec New Zealand 16 Armature Check for burning and overheating Check for bend in the shaft on a ‘v’ block Check for poling Test for short circuit on a growler- blade will vibrate on the short circuit winding. Test the windings for Open circuit -on the commutator segments –Use a ohmmeter or light tester (30V) Test short to ground- from commutator to shaft and armature body –Use ohmmeter
Measure Commutator diameter © Unitec New Zealand 17
Armature Ground test © Unitec New Zealand 18
Commutator continuity test © Unitec New Zealand 19
Commutator test with 42 V © Unitec New Zealand 20
Growler test © Unitec New Zealand 21
Armature Run -Out Test © Unitec New Zealand 22
© Unitec New Zealand 23 Field Coil Check for insulation damage Test for open circuit- between the brush and positive terminal of the field –use ohmmeter or test light Test for short to ground – field coil to the housing –use test light
Field Coil to Short to Ground Test © Unitec New Zealand 24
© Unitec New Zealand 25 Clutch assembly It should lock on one direction and turn freely in the other direction Check for smooth movement along the splines.
One way clutch test © Unitec New Zealand 26
© Unitec New Zealand 27 Armature Thrust Clearance Use filler gauge to measure the clearance If not right adjust it using shims
© Unitec New Zealand 28 Pinion Clearance Disconnect SM terminal from the solenoid Apply battery power to S and SM terminal of the solenoid Pinion should move out without the armature spinning. Check the clearance
Pinion Clearance © Unitec New Zealand 29
Test Bench © Unitec New Zealand 30
STARTING SYSTEM. Battery provides the current to turn the starter motor. Fuse protects the circuit. Ignition switch closes the circuit. Relay uses small.
© 2012 Delmar, Cengage Learning Starting System Service Chapter 29.
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Publisher The Goodheart-Willcox Co., Inc. Tinley Park, Illinois.
Starting Systems State a major safety precaution when removing or working around a starting motor.
© 2015 Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.
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© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only.
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Common starting system problems. n n In a no-crank problem, the engine crankshaft does NOT rotate properly with the ignition key at start. The most common.
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Starter System Service Chapter 33 Page 439. Service Begins with Checking System Check the battery first –Voltage should be 12.6 and while the starter.
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© 2011 Pearson Education, Inc. All Rights Reserved Automotive Technology, Fifth Edition James Halderman CRANKING SYSTEM 52.
SERVICING CLUTCHES l Chapter 3 l Page 49 l Lab manual l Page 45 l Classroom Manual.
© 2012 Delmar, Cengage Learning Starting System Fundamentals Chapter 28.
ALTERNATOR OVERHAUL AUTOMOTIVE TECHNOLOGY. JH BEFORE YOU REMOVE ALTERNATOR Pay attention to how wires are connected Pay attention to Alternator oreintation.
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Clutches Basic purpose Used to disengage engine from input shaft Flywheel –Bolted to crankshaft –Provides surface for clutch disc to work on Clutch disc.
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Q1 Engine turns over normally Q7 cranking problem? NO Not at all or slowly Q2 The headlights Come on and stay on while turning the key Q8 battery problem?
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