Remove/install knock sensors (Engine 156) - AR15.12-P-2184GZS

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ENGINE 156 in MODEL 164, 251

Fig 1: Identifying Knock Sensors Remove/Install Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Remove/install
	Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof.	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Risk of death caused by vehicle slipping or toppling off the lifting platform.	Align vehicle between the columns of the lifting platform and position the four support plates at the lifting platform support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	Notes on avoiding damage to electronic components due to electrostatic discharge	All models	AH54.00-P-0001-01A
	Risk of explosion caused by oxyhydrogen gas. Risk of poisoning and caustic burns caused by swallowing battery acid. Risk of injury caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries	No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
1	Disconnect ground line from battery	Only when removing right knock sensor 1 (A16/1) is necessary. Insulate ground line clamp as a protection against unintentional contact of dismounted ground line with ground point of battery. Vehicles with code 889, Keyless Go: Switch engine off, remove Keyless-Go cards from the vehicle and store outside of transmitter range.
		Model 164	AR54.10-P-0003GZ
		Model 251	AR54.10-P-0003RT
	Notes on battery	All models	AH54.10-P-0001-01A
2	Open engine hood	Model 164	AR88.40-P-1000GZ
		Model 251	AR88.40-P-1000RT
3	Remove partition wall between wheelhouses	Only model 251.	AR62.30-P-2400RT
4	Remove air filter housing	Do not tilt front engine cover, but lift upwards vertically otherwise the retaining lugs can break off.	AR09.10-P-1150GZS
5	Mount engine hoist	Model 164	AR33.10-P-0100-01GZ
		Model 251	AR33.10-P-0100-01RT
		Engine supporting frame basic frame side piece (M/S-class) Model 251: ↓	*WE58.40-Z-1027-11A
		Engine lifting device side adapter for model 251	*WH58.30-Z-1019-07A
6	Raise vehicle with lifting platform	Model 164	AR00.60-P-1000GZ
		Model 251	AR00.60-P-1000RT
7	Remove lower engine compartment paneling	Model 164	AR61.20-P-1105GZ
		Model 251	AR61.20-P-1105RT
8	Disconnect electrical connections at alternator	Only model 251 when removing right knock sensor (A16/1).
9	Remove engine mount with front engine support on the appropriate side	Depending on which knock sensor, on the right or left, should be removed.	AR22.10-P-1260GZS
10	Unlock and remove the electrical connector (1, 3).	Depending on which knock sensor, on the right or left, should be removed.
11	Undo bolt (2, 4)	Depending on which knock sensor, on the right or left, should be removed.
			*BA15.10-P-1001-02C
12	Remove right knock sensor 1, (A16/1) or left knock sensor 2 (A16/2)
13	Install in the reverse order
14	Perform basic programming	Model 164	AR00.19-P-0200GZ
		Model 251	AR00.19-P-0200RT
15	Read out fault memory and erase if required	STAR DIAGNOSIS diagnosis system	*WH58.30-Z-1048-13A
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A
	Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
16	Carry out engine test run

KNOCK SENSORS

Number	Designation		Engine 156
BA15.10-P-1001-02C	Bolt, knock sensor to crankcase	Nm	20

COMMERCIALLY AVAILABLE TOOLS

Number	Designation
WH58.30-Z-1019-07A	Side adapter for engine lifting device, Company BlitzRotary GmbH D-78199 Br unlingen
WH58.30-Z-1048-13A	STAR DIAGNOSIS diagnosis system, Compact Passenger Car	6511 1801 00

WORKSHOP EQUIPMENT

WE58.40-Z-1027-11A

Engine support frame