Remove/install ignition coils

AR15.12-P-2003V

Remove/install ignition coils

18.11.2019

Engine

271 in model 171

1

Engine cover

2

Bolts

a

Spark plug connector

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

Notes on avoiding damage to ignition system

AH15.10-P-0002-01D

 

Remove/install

1

Open engine hood and raise to vertical position

AR88.40-P-1000V

2

Remove engine cover (1) vertically toward top

 Installation: When placing the engine cover (1), ensure that the seal is correctly seated at the oil filler neck. The seal should not be pressed down by the engine cover (1), but must lie against the engine cover (1).

3

Disconnect the electrical connections of the ignition coils of cylinders 1 to 4 (T1 1 to T14)

4

Remove the screw/bolts (2) of the ignition coils for cylinders 1 to 4 (T1 1 up to T14)

 Ignition coil to cylinder head cover

*BA15.12-P-1002-01F

5

Pull the ignition coils of cylinders 1 to 4 (T1 1 up to T14) with the spark plug connector (a) in the upward direction and remove them

 Installation:
To reduce the force required for plugging/unplugging the spark plug connector, grease must be applied before installation of the spark plug connector.
Otherwise the spark plug connector will be damaged when removed again.

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

Spark plug connector grease

*BR00.45-Z-1102-06A

6

Check the connector of ignition coils for cylinders 1 to 4 (T1 1 up to T14)

AR15.12-P-2003-01P



AP15.10-P-1580-01P

Replace the connector in case of damage



Replace ignition coil connector

7

Install in the reverse order

 Distributor ignition (DI [EZL]) system

Number

Designation

Engine 271

BA15.12-P-1002-01F

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