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Remove/Install Alternator - AR15.40-P-5032MNG

Engine 177 in model 253 

G12817207Courtesy of MERCEDES-BENZ USA
Fig 1: Alternator Components Location - Engine 177 in model 253
G12817208Courtesy of MERCEDES-BENZ USA
G12817209Courtesy of MERCEDES-BENZ USA
G12817210Courtesy of MERCEDES-BENZ USA
WARNING Risk of injury.  Skin or eye injuries may result when handling hot or glowing objects. Wear protective gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
CAUTION Risk of injury  to skin and eyes due to handling of engine oil. Risk of poisoning  caused by swallowing engine oil Wear protective gloves, protective clothing and safety glasses. Do not fill engine oil into beverage containers. AS18.00-Z-0001-01A
CAUTION Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels. AS00.00-Z-0017-01A
  Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
  Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
REMOVINGINSTALLING Remove/install     
1 Disconnect battery ground line   AR54.10-P-0003LW
2 Remove ME-SFI control unit (N3/10)   AR07.08-P-7013MNG
    INSTALLATION IMPORTANT Do not install center and front lower engine compartment lining until after leak test.  
3 Remove screw of the bracket of the oil lines (60) from the belt tensioner bracket TORQUE SPECIFICATION Bolt, oil line to engine *BA18.30-P-1009-01N 
4 Remove oil lines (60) from crankcase; collect engine oil in a suitable container INSTALLATION IMPORTANT Install new sealing rings.  
    TORQUE SPECIFICATION Bolt, oil line to engine *BA18.30-P-1009-01N 
5 Seal oil lines (60) and crankcase with suitable stop plugs SPECIAL TOOL Record plug Fig 2
6 Remove additional engine radiator with bracket and air duct segment   AR20.20-P-3867MNG
7 Press radiator package upward out of the left elastomer bearing of the left radiator support mounting console    
8 Pull the radiator package on the left side forward    
9 Remove guide pulley   AR13.20-P-0011MNG
10 Remove contact protection of the electric line B+ nut (11)    
11 Unscrew nut of electric line B+ (11) TORQUE SPECIFICATION Nut, positive line to alternator *BA15.40-P-1003-01T 
12 Remove screw/bolts (2) TORQUE SPECIFICATION Screw/bolt, control unit bracket to engine support/belt tensioner carrier/alternator bracket *BA07.08-P-1001-01G 
13 Remove bracket (1) downward    
14 remove screw (10) TORQUE SPECIFICATION Bolt, alternator to alternator bracket *BA15.40-P-1001-01T 
15 Lift alternator (G2) and twist horizontally so that the electrical connector (12) can be reached    
16 Release and disconnect electrical connector (12)    
17 Take alternator (G2) down and out    
18 Install in the reverse order    
19 Check engine oil level; correct if necessary    
REFER TO MAINTENANCE     AP18.00-P-1812CKI
WARNING Risk of accident  from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. AS00.00-Z-0005-01A
20 Perform engine test run thus checking the alternator (G2) for proper operation and oil lines (60) for leak tightness Check alternator AR15.40-P-5001MNG 
21 Install center and front lower engine compartment paneling   AR61.20-P-1105LW
CONTROL UNIT

Number Designation Engine 177
BA07.08-P-1001-01G Screw/bolt, control unit bracket to engine support/belt tensioner carrier/alternator bracket Nm 9
ALTERNATOR

Number Designation Engine 177
BA15.40-P-1001-01T Bolt, alternator to alternator bracket Nm 20
ALTERNATOR

Number Designation Engine 177
BA15.40-P-1003-01T Nut, positive line to alternator Nm 16
OIL COOLING

Number Designation Engine 177 except in model 463
BA18.30-P-1009-01N Bolt, oil line to engine Nm 8
Fig 2: Identifying Record Plug (129 589 00 91 00)
G11971934Courtesy of MERCEDES-BENZ USA