Remove/Install Ignition Coils - AR15.12-S-2003EG

Model 447, 448 with engine 274 

Courtesy of MERCEDES-BENZ USA

	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
	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
Notice	Notes on avoiding damage to ignition system		AH15.10-P-0002-01V
	Remove/install
1	Switch off ignition
2	Remove air filter housing		AR09.10-S-1150EG
3	Remove trim panel of cylinder head cover		AR01.20-S-5015EG
4	Remove bolt (1)	Screw/bolt, ignition coil to cylinder head cover	*BA15.10-Z-1002-01KOD
5	Remove cylinder 1 ignition coil (T1/11), cylinder 2 ignition coil (T1/12), cylinder 3 ignition coil (T1/13) and cylinder 4 ignition coil (T1/14) upwards
	Service Information: Spark plug connector grease	The respective ignition coil and respective spark plug connectors (3) create a unit and can therefore only be removed and replaced together.	SI15.10-P-0004A
		Spark plug connector grease 35 g	*BR00.45-Z-1102-06A
6	Separate electrical connectors (2)
7	Remove cylinder 1 ignition coil (T1/11), cylinder 2 ignition coil (T1/12), cylinder 3 ignition coil (T1/13) and cylinder 4 ignition coil (T1/14)
	Check
8	Check cylinder 1 ignition coil (T1/1), cylinder 2 ignition coil (T1/2), cylinder 3 ignition coil (T1/3) and cylinder 4 ignition coil (T1/4) and associated spark plug connectors (3) for damage	Replace according to condition.
9	Install in the reverse order
10	Connect diagnostic system, read out fault memory and clear if necessary
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-S-2000-04E

IGNITION SYSTEM

Number	Designation		Engine 274
BA15.10-Z-1002-01KOD	Screw/bolt, ignition coil to cylinder head cover	Nm	9

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1102-06A	Spark plug connector grease 35 g	A 002 989 08 08