Remove/install ignition coils

AR15.12-P-2003MRM

Remove/install ignition coils

12.03.2020

Engine

274.9 in model 167

1

Cable duct

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

 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

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Notes on avoiding damage to ignition system

AH15.10-P-0002-01V

 

Remove/install

1

Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).

2

Remove upper engine cover.



AP01.10-P-2405-01O

3

Remove cable duct (1) and place to one side.

 Screw, engine cable duct to cylinder head cover/charge-air distributor/oil separator/high-pressure pump shielding

*BA01.20-P-1010-01R

4

Release and disconnect electrical connectors of the ignition coils (T1/1, T1/2, T1/3, T1/4).

5

Remove screws (2).

 Screw/bolt, ignition coil to cylinder head cover

*BA15.10-P-1001-04A

6

Detach ignition coils (T1/1, T1/2, T1/3, T1/4) with spark plug connectors upward and remove.

 Installation:
Apply spark plug connector grease to reduce the draw-off and attachment forces.
Otherwise the spark plug connector will be damaged when removed again.

 Installation: Approx. Fill 1 g of spark plug connector grease into the spark plug connector.

Spark plug connector grease

*BR00.45-Z-1102-06A

7

Check ignition coils (T1/1, T1/2, T1/3, T1/4) and spark plug connectors for damage.

If there is a problem,



Replace corresponding components.

8

Install in the reverse order.



Check

9

Connect vehicle diagnosis system, read out fault memory and clear if necessary.



AD00.00-P-2000-06ME

 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

10

Conduct engine test run while checking for proper operation of the engine.

 Crankcase ventilation system, cylinder head cover, camshaft housing

Number

Designation

Engine 274

BA01.20-P-1010-01R

Screw, engine cable duct to cylinder head cover/charge-air distributor/oil separator/high-pressure pump shielding

Nm

8

 Ignition coil

Number

Designation

Engine 274

BA15.10-P-1001-04A

Screw/bolt, ignition coil to cylinder head cover

Nm

9

Repair materials

Number

Designation

Order number

BR00.45-Z-1102-06A

Spark plug connector grease

A 002 989 80 51