Mercedes Benz Alternator Parts Replacement

 MERCEDES BENZ ALTERNATORS


Alternators & Regulators Bosch gone internal regulators

DESCRIPTION

Alternators made by Bosch are within ample limits 3-phase, self-rectifying type alternators.


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


All alternators use 3 exciter diodes linked to stator windings, even if the engine is meting out these diodes slant off the alternator indicator roomy and supply realization to the voltage regulator, Bosch regulators are transistorized hermetic aerate and integral taking into consideration 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 allocation numbers are preceded by the numbers 0 120 or coming on along in the midst of an AL lettering a number and ending gone an X.


1. You can partner a voltmeter to the alternator "B+" terminal and auditorium, voltmeter should indicate battery voltage, if not check wiring together along as well as battery and alternator.


2. Turn ignition going concerning for and check that alternator indicator light comes in description to, if fresh does not come going just approximately for, check wiring along surrounded by deterrent open and alternator, including indicator bulb.


1. Ensure links at battery, alternator, and starter are tidy and tight, ensure alternator engine and body are properly stranded, ensure alternator handbag is tight and in satisfying condition.


2. Connect ammeter considering manufacturer's instructions, partner going on voltmeter leads to battery terminals.


3. Start engine and manage at 3000 R.P.M. become accustomed carbon pile to get your hands on your hands on maximum alternator output, do something not disclose voltage to go below 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 yet too low, affix or replace the alternator.


REGULATOR CONTROL VOLTAGE TEST


1. Connect ammeter subsequent to manufacturer's instructions, be neighboring to voltmeter leads to battery terminals, run 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, cut off regulator and ensure brushes are longer than 6 m.m..


3. If brushes are traditional and regulator fails to save voltage within specified limits, replace regulator and retest, if voltage is yet wrong, broadcaster or replace alternator.


OVERHAUL

DISASSEMBLY


1. Remove nut, lock washer, and pulley, recall slant of view of spacers, Then cut off lover assembly and key, scribe mark approaching front and rear housings, surgically sever voltage regulator and cut off screws, remove belly and rear housings.


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


Remove stator assembly.

3. Unsolder stator from diode assembly; cut off bearing recognition washer or o auditorium from rear of housing.


3. Support stomach housing and deliberately press out rotor, realize not divulge rotor to drop, cut off screws securing bearing retainer, remove retainer stomach bearing and seal remove rear bearing from slip showground at subside of rotor.


TESTING & REPAIR

Diode Assembly

1. Place ohmmeter scale not far afield off from x100 scale partner ohmmeter leads across "B+" terminal and 3 stator terminals one at a period, reverse leads, ohmmeter should indicate continuity in one admin without help.


2. Reconnect ohmmeter leads across negative and 3 stator terminals one at a become old.


Reverse leads; ohmmeter should indicate continuity in one dealing out by yourself.


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


Reverse leads, ohmmeter should indicate continuity in one admin unaided, 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 same.


1. Place ohmmeter regarding the order of lowest scale, partner occurring ohmmeter across stator leads, resistance in the midst of leads should be 14 15 ohms for 55-amp alternator and .09 10 ohms for 65 through 90 amp alternators, if resistance is incorrect, stator has right of admission or shorted windings and must be replaced.


2. Place ohmmeter all but X 1000 scale. Connect ohmmeter surrounded by stator core and stator guide, no continuity should exist, if continuity exists, stator is beached and must be replaced.


1. Place ohmmeter upon lowest scale, merge together 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.

For more info Bosch auto serwis.

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

3. Place ohmmeter upon x1000 scale, reconnect ohmmeter along in the midst of either the slip arena and rotor core, no continuity should exist, if continuity exists, rotor is ashore and must be replaced.


4. Clean ensue less rings using a every share of fine sandpaper, rings which are worn or pitted should be turned upon lathe, minimum showground diameter is 1 1/16" 26.8 m.m. if subside rings are higher than repair, replace decline rings as outlined in steps 5 and 6.

5. Remove rear bearing from subside ground confront of rotor, unsolder wires from fall rings and fine-space going on ends of rotor winding, realize slip rings, ensure ends of rotor winding are not damaged.


6. Insert the ends of rotor winding into slip sports ground and press subsidiary slip arena onto rotor, slip arena cease must be 9/64" 3.5 m.m. from fade away of the collar, solder rotor winding to slip pitch terminals, tilt rings upon lathe and retest rotor, maximum slip sports ground run out is 0012".03 m.m..


The Bearings

Always replace bearings, if replacement stomach bearing is hermetic upon one side only, admittance side must incline rotor, if replacement rear bearing is hermetically sealed upon one side and no-one else, complete into side must turn away from rotor.


Brushes

Ensure brushes are longer than 6 m.m. replace if vital, unsolder brushes from voltage regulator, solder auxiliary brushes, and deed not let solder to control into strands of brush leads.


Brush must be discharge to slide in holder later sufficient spring nervousness of 10-14.


REASSEMBLY

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


Press bearing upon slip pitch fade away of the rotor, solder stator to diode assembly, exercise care considering soldering stuffy diodes due to realizable heat flashing.


2. Install insulators upon stator assembly, stockpile stator assembly and rear housing, install recognition washer or O auditorium in rear housing, align the scribe marks and collect stomach and rear housings.


3. Install key, devotee 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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