Remove/install ignition coils - AR15.12-P-2003MM

ENGINES 157, 278 in MODEL 216 

ENGINES 157, 276, 278 in MODEL 221 

Shown on engine 157 

Fig 1: Identifying Ignition Coils Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death  caused by contact with parts conducting high voltages.	Do not touch parts which conduct high voltages. Persons who wear electronic implants (e.g. heart pacemakers) should never perform any work on the ignition system	AS15.10-Z-0001-01A
	Risk of injury  to skin and eyes caused by handling hot or glowing objects.	Wear safety gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Notes on avoiding damage to ignition system		AH15.10-P-0002-01V
		The ignition coil (T1/1 to T1/6 or T1/1 to T1/8) and spark plug connector (a) create a unit and can therefore only be removed and replaced together.
1	Switch off ignition
2	Detach vacuum reservoir from bracket for ME-SFI [ME] control unit	Engine 276, if necessary
3	Remove upper engine covers (1H, 1V)	Engine 278
4.1	Remove both engine air intake ducts (4) upstream of air filter and air filter housing (2)	Engine 278
4.2	Remove air filter housing (2).	Engine 276
5	Remove insulation on rail	Engine 278
6	Detach connector (3) on ignition coils (T1/1 to T1/6 or T1/1 to T1/8)
7	Remove bolts (5) of ignition coils (T1/1 to T1/6 and T1/1 to T1/8)		*BA15.10-P-1001-04A
8	Pull ignition coils (T1/1 to T1/6 and T1/1 to T1/8) with spark plug connectors (a) upwards and out
	Checking
9	Check ignition coils (T1/1 to T1/6 or T1/1 to T1/8) and spark plug connector (a) for damage and replace if necessary
10	Install in the reverse order
11	Read out fault memory with STAR DIAGNOSIS and erase if necessary		AD00.00-P-2000-04A