Remove/install alternator · ar1540y5032ind · Mercedes-Benz WIS

AR15.40-Y-5032IND

Remove/install alternator

10.03.2020

Engine

400.925/926/927/928 in model 831.001/002/005

Y15.40-A005-07

Charging system removal and installation procedure

Battery ground line

Wiring harness connector

Positive wire

4	Drive belt
5	Alternator mounting bolts

Y15.40-0062-04

 Danger	Risk of fire/risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of poisoning caused by swallowing battery electrolyte or absorption of lead through the skin or body orifices. Risk of death due to voltage U >= 30 V AC and U >= 60 V DC.	No fires, sparks, open flames, or smoking. Wear acid-resistant gloves, clothing, and glasses. Pour battery acid only into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
Topical note	Notes on battery		AH54.10-P-0001-01A
 	Remove/install
1	Switch off ignition.	 Allow the engine to cool down to atmospheric temperature before starting any service procedure.
2	Disconnect the battery ground line (1).
3	Disconnect the wiring harness connector (2) from the alternator.
4	Disconnect the positive wire (3) from the back of the alternator.	 Positive wire is a white wire hold on a retaining nut.
		 Electrical connection to alternator	*BA15.40-Y-1002-01B
5	Remove the drive belt (4) from the alternator pulley by loosening the adjusting bolt on the alternator bracket.		AR13.22-Y-3902-05A
		 Installation: Route the belt (4) over the crankshaft, fan and alternator pulley and tighten the adjusting bolt on top of the alternator at specified belt tension value. Inspect for signs of cracking, oil, hard glazed, splitting or fraying of the drive belt.
		If any damage found,
		
		replace the drive belt.
6	Remove the alternator on the engine compartment by removing the mounting bolts (5) from the alternator bracket.	 Alternator to mounting bracket	*BA15.40-Y-1001-01B
7	Check alternator.		AR15.40-Y-9301-02B
			AR15.40-Y-0010-02B
8	Install in the reverse order.

 Alternator

Number	Designation		Engine 400.925/926/927/928 in model 831.001/002/005
BA15.40-Y-1001-01B	Alternator to mounting bracket	Nm	65

 Alternator

Number	Designation		Engine 400.925/926/927/928 in model 831.001/002/005
BA15.40-Y-1002-01B	Electrical connection to alternator	Nm	30

Referenced documents

ah5410p000101a Notes on battery
ah5410p000101a
ar1322y390205a Slacken, tension poly-V belt
ar1540y001002b Check alternator function
ar1540y930102b Test alternator diodes
as5410z000101a Risk of fire/risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of