Replace Spark Plugs - AP15.10-P-1580E

Engine 256.9 in model 167, 213, 222, 238, 257, 290 

Shown on engine 256.9 in model 223.163 

Courtesy of MERCEDES-BENZ USA

Shown on engine 256.9 in model 223.163 

Courtesy of MERCEDES-BENZ USA

Shown on engine 256.9 in model 223.163 

Courtesy of MERCEDES-BENZ USA

Shown on engine 256.9 in model 223.163 

Courtesy of MERCEDES-BENZ USA

Shown on engine 256.9 in model 223.163 

Courtesy of MERCEDES-BENZ USA

Shown on ignition coil in engine 157.980 

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  from engine start by remote start function	Prior to starting work, open engine hood, do not reach into rotation range or hazard area of freely rotating parts, wear closed and snug-fitting work clothes	AS00.00-Z-0024-01A
Notice	Information on avoiding damage when replacing spark plugs		AH15.10-P-0002-02A
Notice	Notes on avoiding damage to ignition system		AH15.10-P-0002-01V
	Remove
1	Switch electronic ignition lock control unit to position "0".
2	Remove engine cover (21) with cold air guide (22).
3	Remove engine air intake duct downstream of air filter (7).
		Engine 256.9 in model 167	AR09.10-P-8130MSC
		Engine 256.9 in model 213, 238, 257, 290	AR09.10-P-8130MSA
		Engine 256.9 in model 222	AR09.10-P-8130MRT
4	Remove noise damper (8).
5	Unhook retaining clips (9).	Do not crush or kink or subject electric lines to tension. Damage can otherwise occur.
6	Remove screws (5a).	Socket wrench bit	Fig 1
7	Remove ignition coils (6a, 6b, 6c, 6d, 6e) with connected lines and set down as per graphic.	Do not crush or kink or subject electric lines to tension. Damage can otherwise occur.
8	Lift up noise damper (10) and unhook retaininc clip (11).	Do not crush or kink or subject electric lines to tension. Damage can otherwise occur.
9	Place loosened wiring harness (12) on noise damper (10), as shown.
10	Remove screws (5b).	Socket wrench bit	Fig 1
11	Remove ignition coil (6f) with connected lines and set down as per graphic.	Do not crush or kink or subject electric lines to tension. Damage can otherwise occur.
	Clean
12	Use compressed air to blow out any dirt residue in the spark-plug recesses.	Set of protective covers	Fig 2
		Record plug	Fig 4
	Remove
13	Unscrew spark plugs (1) using spark plug wrench (01) from cylinder head.	Spark plug wrench	Fig 3
	Install
14	Screw new spark plugs (1) using spark plug wrench (01) into cylinder head.	Spark plug to cylinder head	*BA15.10-P-1001-01C
		Spark plug wrench	Fig 3
	Check
15	Check spark plug connectors (2), ignition coils (6a, 6b, 6c, 6d, 6e, 6f) and ignition lines for damage, deformation and cracking.	If problems are determined, ↓ rectify the problems. After obtaining special order.
	Install
16	Apply coating of spark plug connector grease to sealing lips (3) of spark plug connectors (2) before installation.	Spark plug connector grease	*BR00.45-Z-1102-06A
17	Install ignition coil (6f) with connected lines.
18	Screw in screws (5b).	Screw/bolt, ignition coil to cylinder head cover	*BA15.10-P-1001-04A
		Socket wrench bit	Fig 1
19	Take loosened wiring harness (12) from noise damper (10) and route back to installation position.
20	Hook in retaining clip (11) and move noise damper (10) to design position.
21	Install ignition coils (6a, 6b, 6c, 6d, 6e) with connected lines.
22	Screw in screws (5a).	Screw/bolt, ignition coil to cylinder head cover	*BA15.10-P-1001-04A
		Socket wrench bit	Fig 1
23	Hook in retaining clips (9).
24	Install noise damper (8).
25	Install engine air intake duct downstream of air filter (7).
		Engine 256.9 in model 167	AR09.10-P-8130MSC
		Engine 256.9 in model 213, 238, 257, 290	AR09.10-P-8130MSA
		Engine 256.9 in model 222	AR09.10-P-8130MRT

Fig 1: Identifying Socket Wrench Bit (256 586 00 09 00)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Set Of Protective Covers (001 589 03 91 00)

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Fig 3: Identifying Spark Plug Wrench (278 589 00 09 00)

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Fig 4: Identifying Record Plug (129 589 00 91 00)

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