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

Engine 139 in model 118, 177, 247 

Fig 1: Ignition Coils Components Location - Model 118 With Engine 139

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
	Risk of injury  due to fan starting unexpectedly	Do not reach into the rotation area or danger zone of the fan. Wear closed and snug-fitting work clothes.	AS20.40-Z-0001-01A
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove upper engine cover.
			AP01.10-P-2405-01K
2	Remove screws (2).	Screw/bolt, ignition coil to cylinder head cover	*BA15.10-P-1001-04A
3.1	Release and disconnect electrical connectors (1) of the ignition coils from cylinders 1 to 3 (T1/1 to T1/3).	Only when removing the ignition coils of cylinders 1 to 3 (T1/1 to T1/3).
3.2	Pull the ignition coil out of cylinder 4 (T1/4) somewhat; release and disconnect electrical connector (1).	Only when removing the ignition coil of cylinder 4 (T1/4). Firstly, insert the ignition coil of cylinder 4 (T1/4) with the spark plug connector about half way into the opening. Then, connect the electrical connector (1) and lock.
4	Remove ignition coils from cylinders 1 to 4 (T1/1 to T1/4).	To reduce the force required for connection and disconnection of the spark plug connector, apply approx. 1 g of spark plug connector grease before installation. Otherwise the spark plug connector will be damaged when removed again. Spark plug connector grease 35 g	*BR00.45-Z-1102-06A
5	Check ignition coils of cylinders 1 to 4 (T1/1 to T1/4) and the spark plug connectors for damage.	If damage occurs, ↓ Replace corresponding components.
6	Install in the reverse order.
	Check
7	Connect vehicle diagnosis system, read out fault memory, and delete.
			AD00.00-P-2000-06MFA
	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
8	Conduct engine test run while checking for proper operation of the engine.

IGNITION COIL

Number	Designation		Engine 139
BA15.10-P-1001-04A	Screw/bolt, ignition coil to cylinder head cover	Nm	8

REPAIR MATERIALS

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