Remove/install ignition coils

AR15.12-P-2003W

Remove/install ignition coils

18.11.2019

Engine

276 in model 172

Shown on model 172 with engine 276.9

1

Front engine cover

a

Spark plug connector

T1/4

Cylinder 4 ignition coil

2

Air cleaner housing

T1/1

Cylinder 1 ignition coil

T1/5

Cylinder 5 ignition coil

4

Electrical connectors

T1/2

Cylinder 2 ignition coil

T1/6

Cylinder 6 ignition coil

5

Bolts

T1/3

Cylinder 3 ignition coil

 Warning

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

 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

 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

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 transmission range (min. 2 m)

2.1

Remove front engine cover (1)

Engine 276.9 in model 172

 Installation: The front engine cover is only installed after the engine test run.

2.2

Remove upper engine cover

Engine 276.8 in model 172

 Installation: The top engine cover is only installed after the engine test run.

3.1

Remove air filter housing (2)

Engine 276.9 in model 172
For removal of the ignition coils (T1/1, T1/2, T1/3).

 Screw/bolt, air filter to cylinder head cover

*BA09.10-P-1001-01M

 Screw/bolt, air filter to air intake pipe support brace

*BA09.10-P-1002-01M

3.2

Remove right air filter housing

Engine 276.8 in model 172
For removal of the ignition coils (T1/1, T1/2, T1/3).

AR09.10-P-1150RKA

4.1

Remove the vacuum reservoir from the engine management control unit bracket

Engine 276.9 in model 172
When removing the ignition coils (T1/4, T1/5, T1/6).

4.2

Remove left-hand air filter housing

Engine 276.8 in model 172
When removing the ignition coils (T1/4, T1/5, T1/6).

AR09.10-P-1150RKA

5

Remove left or right soundproofing at the rail

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

Unscrew the screws (5) at the ignition coils (T1/1, T1/2, T1/3, T1/4, T1/5, T1/6)

 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

 Installation:
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.

 Installation: 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

 Warning

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

 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

13

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

 Air filter

Number

Designation

Engine 276.9

BA09.10-P-1001-01M

Screw/bolt, air filter to cylinder head cover

Nm

9

 Air filter

Number

Designation

Engine 276.9

BA09.10-P-1002-01M

Screw/bolt, air filter to air intake pipe support brace

Nm

9

 Ignition coil

Number

Designation

Engine 276

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