Mercedes Benz Alternator Parts Replacement

 MERCEDES BENZ ALTERNATORS


Alternators & Regulators Bosch following internal regulators

DESCRIPTION

Alternators made by Bosch are stated 3-phase, self-rectifying type alternators.


Bosch 75 through 55-amp alternators use3 negative 3 deferential and diodes associated to stator windings to rectify current, Bosch 90 and 80-amp alternators use 14 diodes.


All alternators use 3 exciter diodes united to stator windings, even though the engine is paperwork these diodes position off the alternator indicator lighthearted and supply facility to the voltage regulator, Bosch regulators are transistorized hermetically sealed disclose and integral in the midst of alternator.


ALTERNATOR APPLICATION

Model Volts/Amps


(1) Manufacturer's Part No.


190E 14/70 489 928

190D 14/70 489 897


All Others 14/70 N/A

(1) Bosch alternator portion numbers are preceded by the numbers 0 120 or start taking into consideration an AL lettering a number and ending gone an X.


1. You can be beside a voltmeter to the alternator "B+" terminal and sports ground, voltmeter should indicate battery voltage, if not check wiring surrounded by battery and alternator.


2. Turn ignition as regards and check that alternator indicator well-ventilated comes not far afield off from the subject of, if spacious does not come in the region of, check wiring together along with rebuke spacious and alternator, including indicator bulb.


1. Ensure buddies at battery, alternator, and starter are tidy and tight, ensure alternator engine and body are properly beached, ensure alternator accomplice is tight and in to your liking condition.


2. Connect ammeter next than manufacturer's instructions, be by the side of voltmeter leads to battery terminals.


3. Start engine and warn at 3000 R.P.M. adapt carbon pile to get goodwill of maximum alternator output, make a gaining of not meet the expense of entry voltage to go out cold 12.6 volts.


4. Alternator output should equal alternator rated output, minus 16-20 amps, if reading is 16-20 amps below alternator rating, replace regulator and retest, if output is still too low, repair or replace the alternator.


REGULATOR CONTROL VOLTAGE TEST


1. Connect ammeter in the midst of manufacturer's instructions, partner voltmeter leads to battery terminals, control engine at 3000 R.P.M.


2. Run engine until voltage stops rising, voltage should be 13.5-14.5 volts, if reading is wrong, surgically remove regulator and ensure brushes are longer than 6 m.m..


3. If brushes are received and regulator fails to sticking to voltage within specified limits, replace regulator and retest, if voltage is yet wrong, repair or replace alternator.


OVERHAUL

DISASSEMBLY


1. Remove nut, lock washer, and pulley, recall viewpoint of view of spacers, Then remove addict assembly and key, scribe mark vis--vis speaking front and rear housings, cut off voltage regulator and surgically surgically surgically cut off screws, surgically remove front and rear housings.


2. Disconnect capacitor from terminal; remove nut, insulators, screws and washers.


Remove stator assembly.

3. Unsolder stator from diode assembly; remove bearing allergic reaction washer or o sports ground from rear of housing.


3. Support stomach housing and deliberately press out rotor, dynamism not aerate rotor to drop, remove screws securing bearing retainer, remove retainer front bearing and seal remove rear bearing from slip showground at halt of rotor.


TESTING & REPAIR

Diode Assembly

1. Place ohmmeter scale in this area x100 scale colleague happening ohmmeter leads across "B+" terminal and 3 stator terminals one at a period, reverse leads, ohmmeter should indicate continuity in one admin on your own.


2. Reconnect ohmmeter leads across negative and 3 stator terminals one at a grow antiquated-fashioned-fashioned.


Reverse leads; ohmmeter should indicate continuity in one management unaccompanied.


3. Connect ohmmeter leads across "D+" terminal and 3 stator terminals one at a period.


Reverse leads, ohmmeter should indicate continuity in one handing out by yourself, if diodes are found to be defective, replace the diode assembly.


Fig. 3: Diode Assembly Test Diode assembly for 55 amp alternator is shown, others are related.


1. Place ohmmeter vis--vis lowest scale, partner ohmmeter across stator leads, resistance in the middle of leads should be 14 15 ohms for 55-amp alternator and .09 10 ohms for 65 through 90 amp alternators, if resistance is wrong, stator has entre or shorted windings and must be replaced.


2. Place ohmmeter upon X 1000 scale. Connect ohmmeter in the middle of stator core and stator guide, no continuity should exist, if continuity exists, stator is ashore and must be replaced.


1. Place ohmmeter upon lowest scale, stick ohmmeter across slip rings, resistance should be 3 4-3.75 ohms for 55 amp alternator and 2.8 3.1 ohms for 65 through 90 amp alternators.


2. If resistance is too low, rotor has unexpected circuit and it must be replaced if resistance is infinity no continuity, rotor has entre circuit and must be replaced.

3. Place ohmmeter upon x1000 scale, reconnect ohmmeter along along as well as either the slip pitch and rotor core, no continuity should exist, if continuity exists, rotor is stranded and must be replaced.


4. Clean slip rings using a utterly pleasing sandpaper, rings which are worn or pitted should be turned upon lathe, minimum sports ground diameter is 1 1/16" 26.8 m.m. if slip rings are complex than repair, replace slip rings as outlined in steps 5 and 6.

5. Remove rear bearing from slip showground subside of rotor, unsolder wires from slip rings and regulate happening ends of rotor winding, tug off slip rings, ensure ends of rotor winding are not damaged.


6. Insert the ends of rotor winding into slip pitch and press added slip auditorium onto rotor, slip sports ground subside must be 9/64" 3.5 m.m. from cease of the collar, solder rotor winding to slip field terminals, slant rings upon lathe and retest rotor, maximum slip arena control out is 0012".03 m.m..


The Bearings

Always replace bearings, if replacement stomach bearing is hermetic upon one side deserted, quirk in side must position rotor, if replacement rear bearing is hermetically sealed upon one side unaccompanied, right of entry side must point away from rotor.


Brushes

Ensure brushes are longer than 6 m.m. replace if bitter, unsolder brushes from voltage regulator, solder subsidiary brushes, and conduct yourself not let solder to run into strands of brush leads.


Brush must be pardon to slide in holder following within permissible limits spring nervousness of 10-14.


REASSEMBLY

1. Install the bearing, retainer, and screws in belly housing, press rotor onto housing.


Press bearing upon slip ground decrease of the rotor, solder stator to diode assembly, exercise care gone than soldering close diodes due to possible heat damage.

For more info Bosch auto serwis.

2. Install insulators upon stator assembly, gather together stator assembly and rear housing, install reply washer or O pitch in rear housing, align the scribe marks and accumulate belly and rear housings.


3. Install key, lover assembly, and spacers, install the pulley, lock washer and nut, tighten nut to 23-29 ft. 3-4 Nm. Ensure rotor spins freely, and install voltage regulator and capacitor.


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