Remove/Install Integrated Starter Alternator Control Unit - AR15.40-P-0004MSC

Engine 256.9 In Model 167 

MODIFICATION NOTES

07.05.2019	Phase bolt on inverter.		BA15.40-P-1008-02MRT
17.07.2019	Clamp off coolant lines	Step 4
17.07.2019	Perform venting routine.	Operation step 18
31.03.2020	Screw, holder for wiring harness (integrated starter alternator/refrigerant compressor/transmission) to crankcase		BA15.40-P-1014-02MRT

Fig 1: Integrated Starter Alternator Control Unit Components Location - Engine 256.9 In Model 167

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

	Risk of injury  To skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning  from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90°. Open cap slowly and release the overpressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
	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
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Notes on safety-relevant components		AH00.00-Z-0019-01A
	Remove/install
1	Disconnect ground line from battery.		AR54.10-P-0003ME
2	Remove exhaust gas aftertreatment unit.		AR49.20-P-1500MSC
3	Remove heat shield above starter-alternator control unit (N129).	Screw, heat shield to crankcase/catalytic converter bracket/ Engine mount heat shield	*BA22.10-P-1004-02A
4	Clamp off coolant lines (1, 2).	Clamp	Fig 3
5	Remove coolant lines (1, 2) from starter-alternator control unit (N129) and seal openings with protective covers.		AR20.20-P-7441-01RQ
		Set of protective covers	Fig 2
6	Remove coolant line (2) from timing case cover and place to one side.	Bolt, coolant return line to timing case	*BA15.40-P-1009-02MRT
7	Remove coolant line (1) from crankcase and place to one side.	Bolt, coolant feed pipe to crankcase	*BA15.40-P-1010-02MRT
8	Release and disconnect electrical connector (4).
9	Open plug housing, remove nuts (3), and remove electric lines from the starter-alternator control unit (N129).	Nut, circuit 40/41 to starter-alternator control unit	*BA15.40-P-1011-02MRT
10	Remove bracket (7) and place 48 V wiring harness (5) to one side.	Bolt, holder for wiring harness (integrated starter alternator/refrigerant compressor/transmission) to crankcase	*BA15.40-P-1014-02MRT
		M6X1	*BA00.10-P-1002-04A
11	Remove holder (6).	Nut/bolt, holder for catalytic converter to crankcase	*BA49.10-P-1007-02P
12	Remove screws (10) and remove cap (11).	: Replace seal.
		Bolt, terminal box cover to starter-alternator control unit	*BA15.40-P-1004-02MRT
13	Release and disconnect electrical connector (12).	Press release mechanism in arrow direction A Otherwise, damage to the starter-alternator control unit (N129) will occur.
14	Unscrew screws (13).	Phase bolt on inverter	*BA15.40-P-1008-02MRT
15	Remove screws (14) and remove starter-alternator control unit (N129).	: Replace seal.
		Bolt, starter-alternator control unit to crankcase/timing case	*BA15.40-P-1005-02MRT
16	Install in the reverse order.
17	Check Engine cooling system for leak tightness.		AR20.00-P-1010MSC
18	Connect diagnostic device and perform venting routine.
			AD00.00-P-2000-06ME
19	Check coolant level and correct.	Coolant mixing ratio	*BF20.00-P-1001-04A
20	Read out and delete fault memory.
			AD00.00-P-2000-06ME
	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
21	Carry out engine test run and check engine for proper operation and leak tightness.
22	Install lower Engine compartment lining.		AR61.20-P-1105ME

METRIC SCREWS/BOLTS AND NUTS AS PER MBN 10 105, 10 143

Number	Designation		8.8	10.9
BA00.10-P-1002-04A	M6X1	Nm	9	13

STARTER-ALTERNATOR

Number	Designation		Engine 256
BA15.40-P-1004-02MRT	Bolt, terminal box cover to starter-alternator control unit	Nm	8

STARTER-ALTERNATOR

Number	Designation		Engine 256
BA15.40-P-1005-02MRT	Bolt, starter-alternator control unit to crankcase/timing case	Nm	8

STARTER-ALTERNATOR

Number	Designation		Engine 256
BA15.40-P-1008-02MRT	Phase bolt on inverter	Nm	11

STARTER-ALTERNATOR

Number	Designation		Engine 256
BA15.40-P-1009-02MRT	Bolt, coolant return line to timing case	Nm	8

STARTER-ALTERNATOR

Number	Designation		Engine 256
BA15.40-P-1010-02MRT	Bolt, coolant feed pipe to crankcase	Nm	8

STARTER-ALTERNATOR

Number	Designation		Engine 256
BA15.40-P-1011-02MRT	Nut, circuit 40/41 to starter-alternator control unit	Nm	16

STARTER-ALTERNATOR

Number	Designation		Engine 256
BA15.40-P-1014-02MRT	Bolt, holder for wiring harness (integrated starter alternator/refrigerant compressor/transmission) to crankcase	Nm	12

ENGINE SUPPORT (ENGINE SIDE)

Number	Designation		Engine 256
BA22.10-P-1004-02A	Screw, heat shield to crankcase/catalytic converter bracket/ Engine mount heat shield	Nm	8

EXHAUST SYSTEM

Number	Designation		Model 167 with Engine 256
BA49.10-P-1007-02P	Nut/bolt, holder for catalytic converter to crankcase	Nm	20

COOLANT MIXING RATIO

Number	Designation				All Engines, except Engine 178 in model 190.381
BF20.00-P-1001-04A	Coolant mixing ratio	Antifreeze/water	Up to -25°	%	-
			Up to -37°	%	50/50
			As of -38°	%	55/45
			Overview and specifications sheet		BB00.40-P-0310-01A
			References to sheet specification		BB00.40-P-0310ZZ

Fig 2: Identifying Set Of Protective Covers (001 589 06 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Clamp (000 589 40 37 00)

Courtesy of MERCEDES-BENZ USA