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

Engine 256.9 In Model 167

MODIFICATION NOTES

20.05.2021

Special tool added.

Operation step 7.

Fig 1: Ignition Coils Components Location - Engine 256.9 In Model 167

Courtesy of MERCEDES-BENZ USA

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 To skin and eyes due to handling of Engine oil. Risk of poisoning caused by swallowing Engine oil	Wear protective gloves, protective clothing and safety glasses. Do not fill Engine oil into beverage containers.	AS18.00-Z-0001-01A
Notice	Notes on avoiding damage to ignition system		AH15.10-P-0002-01V
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	Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).
2	Remove Engine air intake duct downstream of air filter.		AR09.10-P-8130MSC
		: Do not install the upper Engine cover until an Engine test run has been performed.
3	Remove front noise insulation.
4	Remove bleed line from oil separator and seal openings with suitable stop plugs.	Record plug	Fig 3
5	Remove rear noise insulation.
6	Release and disconnect electrical connectors of ignition coils (T1/1 to T1/6).
7	Remove screws/bolts (2).	Screw/bolt, ignition coil to cylinder head cover	*BA15.10-P-1001-04A
		Socket wrench bit
8	Detach ignition coils (T1/1 to T1/6) with spark plug connectors (3) upwards and remove.	Apply spark plug connector grease in spark plug connectors (3) before installation to reduce withdrawal and insertion forces. Otherwise damage will occur. : Approx. Fill 1 g of spark plug connector grease into the spark plug connectors (3).
		Spark plug connector grease	*BR00.45-Z-1102-06A
	Check
9	Check O-rings of bleed line for damage.	If damage is present: ↓ Replace bleed line.
10	Check ignition coils (T1/1 to T1/6) for external damage.	If damage is present: ↓ Replace corresponding ignition coil (T1/1 to T1/6).
11	Install in the reverse order.
	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
12	Perform an Engine test run and check the Engine for proper function.
13	Install upper Engine cover.		AR01.10-P-2405MSC