Starter - Delco-Remy Chevrolet Camaro III рестайлинг

DESCRIPTION

General Motors starters have an enclosed solenoid, shift lever and overrunning clutch. Starter circuits differ depending upon load and speed requirements.

The 5MT series small starter has its field coils permanently mounted in the frame. The 10MT large starter has an optional center bearing.

Diagnosis

1. If a high-pitched whine is present during cranking (before engine starts), but engine eventually starts okay, distance is too great between starter pinion and flywheel. If a high-pitched whine is present after engine starts and key is released, distance is too small between starter pinion and flywheel.
2. If a loud "whoop" sound like a siren is present after engine starts, clutch is likely defective. If a "rumble", "growl" or "knock" is present as starter is coasting to a stop after starting engine, starter armature is either bend or unbalanced.

Repair

1. Starter shimming usually will correct starter motor noise present during starting. Check flywheel for damage. Using care, start engine and touch outside diameter of turning flywheel ring gear with chalk or crayon to determine high point of tooth runout.
2. Turn engine off. Disconnect negative battery cable to prevent engine from starting. Rotate flywheel so marked teeth are in starter pinion gear area. Using a wire gauge of.020" (.5 mm) thickness, check pinion-to-flywheel clearance. (Scheme 1)
3. Center a starter pinion tooth between 2 flywheel teeth and gauge. DO NOT measure in corners, as an incorrect larger measurement may be obtained. If clearance is less than minimum thickness of.020" (.5 mm), starter should be shimmed away from flywheel.
4. If clearance is greater than specification by.060" (1.5 mm) or more, starter should be shimmed toward flywheel. To shim starter toward flywheel, shim only outward starter mounting pad. A shim of.015" (.4 mm) will decrease thickness by about.010" (.3 mm).

Checking Flywheel-to-Pinion Clearance. Scheme 1

Note. Also see TROUBLE SHOOTING - BASIC PROCEDURES article in the GENERAL TROUBLE SHOOTING section.

SOLENOID WINDING TEST

Note. Solenoid tests are performed with motor leads disconnected to prevent overheating. Complete tests in a minimum of time to prevent overheating.

Hold-In Winding

1. Connect an ammeter in series with a 12-volt battery and "S" terminal on solenoid. (Scheme 2) Connect a voltmeter between solenoid "S" terminal and ground. Connect a carbon pile rheostat across battery.
2. Adjust voltage to 10 volts. Ammeter reading should be 13-19 amps for all starters.

Pull-In Windings

To check both windings, connect test equipment. (Scheme 2) Ground terminal "M" (motor) of solenoid. Adjust voltage to 10 volts and note ammeter reading. If ammeter reading is 59-79 amps, starter solenoid is okay.

Test Results

If current draw readings are greater than specifications, a short or ground is present in windings of the solenoid. Low current draw indicates excessive resistance. If no current is present, there is an open circuit. Check connections and replace starter solenoid as necessary.

Solenoid Winding Test Connections Switch must be open when making connections. Scheme 2

Scheme 3

1. Connect test equipment to starter. (Scheme 3) Close switch and compare RPM, amperage, and voltage readings with specifications. See the «STARTER NO-LOAD TEST SPECIFICATIONS»(/chevrolet/camaro/iii-1985-1992/remont/starter/#starter-delco-remy). (Scheme 3): Starter No-Load Connections Switch must be open when making connections. CAUTION: DO NOT apply greater voltage than specified. Excessive voltage may cause armature to throw windings because of excessive speed.
2. If current draw and RPM meet specification, starter motor is okay. If test indicates low free speed and high current draw, unit may have tight, dirty or worn bearings, shorted armature, or grounded armature or fields.
3. Failure to operate with high current draw indicates a direct ground in terminal fields or frozen bearings. Failure to operate with no current draw indicates an open field circuit, open armature coils, or broken brush springs.
4. Low no load RPM and low current draw indicates high internal resistance due to poor connections, defective leads, or a dirty commutator. High free speed and high current draw indicates shorted fields.

PRELIMINARY TESTS

Remove starter from vehicle. Ensure pinion moves freely on screw shaft. Ensure armature rotates freely by prying pinion with a screwdriver. If armature does not turn freely, motor should be disassembled. If armature does rotate freely, motor should be given a no-load test before disassembly.

ARMATURE

1. Test armature for shorted coils with a growler. Check for grounded coils with a test light. Place one lead on armature shaft and other lead on commutator. Test light should not light. If test light lights, armature is grounded and should be replaced.
2. Turn commutator in a lathe if it is rough, worn, or has protruding insulation. DO NOT turn to less than 1.65" (41.9 mm) diameter. Sand commutator lightly with 240 grit emery paper and clean out the slots.

SERIES COIL OPEN TEST

Using a test light, place one lead on series coil terminal and other lead on insulated brush. If test light fails to light, series coil is open and requires repair or replacement. Repeat test for each insulated brush.

SHUNT COIL OPEN TEST

Using a test light, place one lead on shunt coil terminal and other lead to one ground brush holder. Repeat test for other ground terminal. If test light fails to light on either test, field coil is open and must be repaired or replaced.

SERIES & SHUNT COIL GROUND TEST

Separate series and shunt coil strap terminals. DO NOT allow terminals to contact case or ground during test. Using a test light, place one lead on grounded brush holder and other lead on either insulated brush holder. If test light glows, series coil is grounded and must be repaired or replaced.

BRUSHES, SPRINGS & HOLDERS

Replace brushes if worn to 1/2 of original length or if oil-soaked or pitted. Check brush spring tension and replace springs if weak or distorted.

OVERRUNNING CLUTCH CHECK

Clutch pinion should turn freely in one direction only. Check pinion teeth for chips, cracks, or excessive wear. Chipped teeth may indicate a defective ring gear.

PINION CLEARANCE CHECK

1. Disconnect motor field coil at solenoid "M" terminal and insulate the field connector. Connect a 12-volt positive lead to solenoid "S" terminal and other lead to ground. Touch a jumper lead from solenoid "M" terminal to starter frame, shifting pinion into cranking position.
2. Push pinion away from stop retainer as far as possible. Using a feeler gauge, ensure.010-.140" (.25-3.6 mm) clearance is present between pinion and retainer. (Scheme 5)

Note. Pinion clearance is not adjustable. If clearance is not within specification, motor must be disassembled and rechecked.

Typical Cranking Circuit. Scheme 4

Checking Pinion End Play. Scheme 5

OVERHAUL

Overhaul information is not available. Refer to the figure for disassembly and reassembly reference. (Scheme 6)

Exploded View of Delco-Remy 5MT Starter The 10MT starter is similar. Scheme 6

SPECIFICATIONS

STARTER NO-LOAD TEST SPECIFICATIONS

See also:
• TROUBLE SHOOTING - BASIC PROCEDURES
• STARTER NO-LOAD TEST SPECIFICATIONS