Remove/install ignition coils

AR15.12-P-2003MSC

Remove/install ignition coils

03.08.2020

Engine

256.9 in model 167

Modification notes

22.07.2020

Check O-rings for damage.

Operation step 9.

2

Bolts

T1/1

Cylinder 1 ignition coil

T1/2

Cylinder 2 ignition coil

T1/3

Cylinder 3 ignition coil

T1/4

Cylinder 4 ignition coil

T1/5

Cylinder 5 ignition coil

T1/6

Cylinder 6 ignition coil

3

Spark plug connector

 Caution

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

 Warning

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

 Danger

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

Topical note

Notes on avoiding damage to ignition system

AH15.10-P-0002-01V

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

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

 Installation: 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

*129589009100

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

8

Detach ignition coils (T1/1 to T1/6) with spark plug connectors (3) upwards and remove.

 Installation:
Apply spark plug connector grease in spark plug connectors (3) before installation to reduce withdrawal and insertion forces.
Otherwise damage will occur.

 Installation: 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.

 Warning

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

 Ignition coil

Number

Designation

Engine 256

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

A 002 989 80 51