Replace spark plugs

AP15.10-D-1580A

Replace spark plugs

19.11.2019

Engine

111.948/950/978/980 in model 638

Engine

111.979/984 in model 901, 902, 903, 904

Shown on model 638

1

Intake line

2

Spark plug cover

Shown on model 901, 902, 903, 904

1

Intake line

2

Spark plug cover

3

Ignition coils

4

Spark plug connector

 

Remove/install

 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

1

Switch off ignition

2

Detach intake line (1) from manifold

 Installation: When mounting intake line (1), check for leak tightness.

3

Spark plug cover (2)

4

Remove ignition coils (3) with lines connected

 Ignition coil to cylinder head cover

*BA15.10-N-1001-01A

5

Disconnect spark plug connector (4)

 Installation: Ensure correct routing of ignition lines

6

Blow out spark plug wells using compressed air

7

Remove spark plugs

 Installation: Use only approved spark plugs.

 Spark plug in cylinder head

*BA15.10-N-1002-01A

 Spark plug wrench

*119589020900

8

Install in the reverse order

 Ignition system

Number

Designation

ENGINE 111.948/ 950/978/980

Engine 111.979/984

BA15.10-N-1001-01A

Ignition coil to cylinder head cover

Nm

9

9

 Ignition system

Number

Designation

ENGINE 111.948/ 950/978/980

Engine 111.979/984

BA15.10-N-1002-01A

Spark plug in cylinder head

Nm

25

25