Remove/Install Ignition Coils - AR15.12-P-2003LFB

Engine 157, 276, 278 in model 217 

Engine 157, 276, 278 in model 222 

Courtesy of MERCEDES-BENZ USA

Shown on engine 278 

Shown on left cylinder head on engine 276.9 

Fig 1: Ignition Coils Components Location - Engine 276 In Model 222 (Shown On Left Cylinder Head On Engine 276.9)

Courtesy of MERCEDES-BENZ USA

	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 death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	Risk of death  when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)	Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.	AS00.00-Z-0035-01A
Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Topical note	Notes on avoiding damage to ignition system		AH15.10-P-0002-01V
	Remove/install
1	Remove upper engine cover	Engine 276.9 in model 222
2	Remove left and right air filter housing	Engine 276.8 in model 217, 222	AR09.10-P-1150LFA
		Engine 157, 278 in model 217, 222	AR09.10-P-1150LFB
3	Remove air filter housing with engine air intake duct upstream of air filter	Engine 276.9 in model 222
		Screw/bolt, air filter to cylinder head cover	*BA09.10-P-1001-01M
		Screw/bolt, air filter to air intake pipe support brace	*BA09.10-P-1002-01M
4	Unclip engine wiring harness and place ME-SFI [ME] control unit with attached lines to one side	When removing the ignition coils (T1/4, T1/5, T1/6). Engine 276.9 in model 222	AR07.08-P-7008LFH
5	Remove soundproofing on rails
6	Remove screw (3) and remove bracket (4)	Engine 276.9 in model 222 When removing the ignition coil for cylinder 5 (T1/5).
7	Disconnect electrical connections (1) at ignition coils (T1/1 to T1/6 or T1/1 to/1/8)
8	Remove screw/bolts (2) for ignition coils (T1/1 to T1/6 or T1/1 to/1/8)	Screw/bolt, ignition coil to cylinder head cover	*BA15.10-P-1001-04A
9	Pull out ignition coils (T1/1 to T1/6 or T1/1 to/1/8) with spark plug connectors (a) upwards and remove	:  To reduce the force required for plugging/unplugging the spark plug connector, grease must be applied before installation of the spark plug connector. Otherwise the spark plug connector will be damaged when removed again. :  Discharge approx. Fill 1 g of spark plug connector grease into the spark plug connector. Spark plug connector grease	*BR00.45-Z-1102-06A
10	Check ignition coils (T1/1 to T1/6 or T1/1 to/1/8) and spark plug connector (a) for damage and replace if necessary
11	Install in the reverse order
12	Read out fault memory using the diagnostic system and clear if necessary
			AD00.00-P-2000-04B