Remove/Install Left Front Knock Sensor - AR15.12-P-2186SC

Engine 176 in model 223

Fig 1: Left Front Knock Sensor Components Location - Model 223 With Engine 176

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°C. 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 . 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
	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	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove engine from front axle carrier.		AR01.10-P-2510SC
2	Remove left charge-air distributor.		AR09.41-P-8684SC
3	Remove screw (2).	48 V subharness to cylinder head	*BA15.18-P-1002-03D
4	Remove screws (1) and place 48 V wiring harness (3) to one side.	48 V subharness to oil pan/engine carrier/crankcase	*BA15.18-P-1001-03D
5	Unclip bracket (5).
6	Remove screws (4).	Bolt, coolant feed pipe to crankcase/cylinder head/engine carrier/belt tensioner	*BA20.20-P-1002-01Q
7	Release clip (6) and remove coolant feed pipe (9).	: Replace sealing rings and coat with lubricant.	AR20.20-P-7441-01RQ
		Lubricant, rubber assembly 1 L	*BR00.45-Z-1010-06A
		Assembly tool	Fig 2
8	Remove, release and disconnect electrical connector (7).
9	Unscrew screw (8) and remove knock sensor (A29/1).	: The contact surfaces must be free from soiling. Malfunction of knock sensor (A29/1) will otherwise occur. Bolt, knock sensor to crankcase	*BA15.10-P-1001-02G
10	Install in the reverse order.

KNOCK SENSORS

Number	Designation		Engine 176
BA15.10-P-1001-02G	Bolt, knock sensor to crankcase	Nm	20

48 V ON-BOARD ELECTRICAL SYSTEM SUBHARNESS

Number	Designation		Engine 176 in model 223
BA15.18-P-1001-03D	48 V subharness to oil pan/engine carrier/crankcase	Nm	8

48 V ON-BOARD ELECTRICAL SYSTEM SUBHARNESS

Number	Designation		Engine 176 in model 223
BA15.18-P-1002-03D	48 V subharness to cylinder head	Nm	20

RADIATOR, COOLANT HOSES

Number	Designation		Engine 176 in model 223
BA20.20-P-1002-01Q	Bolt, coolant feed pipe to crankcase/cylinder head/engine carrier/belt tensioner	Nm	9

Fig 2: Identifying Assembly Tool (000 589 93 63 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1010-06A	Lubricant, rubber assembly 1 L	A 000 989 03 67