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

Engine 276 in model 166, 251, 292 

Fig 1: Ignition Coils Components Location - Engine 276 In Model 166 (Shown On Engine 276.9)

Courtesy of MERCEDES-BENZ USA

Shown on model 166.0 with 276.9 engine 

	Risk of injury  due to fan starting unexpectedly	Do not reach into the rotation or hazard area of the fan. Wear closed and close-fitting work clothes.	AS20.40-Z-0001-01A
	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
	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
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Notes on avoiding damage to ignition system		AH15.10-P-0002-01V
	Remove/install
1	Switch off ignition and store transmitter key outside of transmission range (min. 2 m)
2	Open hood	Engine 276 in model 251	AR88.40-P-1000RT
		Model 166 with engine 276	AR88.40-P-1000GQ
3	Remove intake manifold	Engine 276.9 in model 166, 251
			AR09.20-P-1961GQ
		The front engine cover (1) is only installed after the engine test run.
4	Remove both air filter housings (2)	Engine 276.8 in model 166, 251, 292 The top engine cover (3) is only installed after the engine test run.	AR09.10-P-1150GQC
5	Remove insulation on the rails
6	Unlock and disconnect the electrical plug connections (4) for the ignition coils (T1/1, T1/2, T1/3, T1/4, T1/5, T1/6)
7	Remove screws/bolts (5)	Screw/bolt, ignition coil to cylinder head cover	*BA15.10-P-1001-04A
8	Pull off and remove the ignition coils (T1/1, T1/2, T1/3, T1/4, T1/5, T1/6) including spark plug connectors (a) towards the top	Apply spark plug connector grease prior to installing the spark plug connector (a) to reduce the force required for connection and disconnection. Otherwise the spark plug connector will be damaged during renewed removal.
		Discharge approx. Fill 1 g of spark plug connector grease into the spark plug connector (a).
		Spark plug connector grease	*BR00.45-Z-1102-06A
9	Check the ignition coils (T1/1, T1/2, T1/3, T1/4, T1/5, T1/6) for damage	If a problem arises ↓ Replace the corresponding ignition coil (T1/1, T1/2, T1/3, T1/4, T1/5, T1/6).
10	Check spark plug connector (a) for damage	If a problem arises ↓ Replace the corresponding spark plug connector (a).
11	Install in the reverse order
	Check
12	Connect diagnostic system; read out fault memory.	Only if required.
			AD00.00-P-2000-04A
	Risk of burn injuries  , suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.	Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.	AS49.00-Z-0001-01A
	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
13	Conduct engine test run while checking for proper operation of the engine